CN102778658B - A kind of ac permeability measuring equipment and method thereof - Google Patents
A kind of ac permeability measuring equipment and method thereof Download PDFInfo
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- CN102778658B CN102778658B CN201110128899.1A CN201110128899A CN102778658B CN 102778658 B CN102778658 B CN 102778658B CN 201110128899 A CN201110128899 A CN 201110128899A CN 102778658 B CN102778658 B CN 102778658B
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Abstract
The present invention is about a kind of ac permeability measurement mechanism and method thereof, this ac permeability measurement mechanism at least comprises an ac permeability coil groups, a signal acquisition unit and a signal processing unit, the ac permeability signal utilizing this ac permeability measurement mechanism can measure test substance to produce under the magnetic field of different a-c cycle, and obtain the value of real part of ac permeability intensity and phase differential and/or ac permeability and the changing value of imaginary values through signal processing unit.
Description
Technical field
The present invention about a kind of ac permeability measurement mechanism and method thereof, the ac permeability measurement mechanism of espespecially a kind of value of real part in order to measure ac permeability intensity and phase differential and/or ac permeability and imaginary values changing value and method.
Background technology
When a magnetisable material is under externally-applied magnetic field, magnetic dipole (magneticdipolemoment) direction in material, can be inclined to along externally-applied magnetic field direction because of magnetic action, when externally-applied magnetic field is AC magnetic field and a-c cycle is not too high, such as, low frequency range under microwave frequency, periodically concussion can be done back and forth along with AC magnetic field in the direction of its magnetic dipole, now the concussion frequency of magnetic dipole is the same with additional AC magnetic field frequency, but moment magnetic dipole direction might not be identical with externally-applied magnetic field direction, therefore actual magnetic direction and the incongruent situation of expection magnetic direction is caused, this kind periodically oscillation phase difference and so-called magnetic phase poor, and the ac permeability of a magnetisable material in AC magnetic field, the magnetic permeability intensity of this magnetisable material and phase differential can be utilized to be presented expression.
Known magnetic characteristic measuring equipment, such as U.S. Publication patent 6, 683, a kind of device utilizing magnetic density to detect metal inside defect or form of metal disclosed by 452, this device comprises a magnetic field generation device, one magnetic density measuring unit, one magnetic flux change measuring unit and a display unit, part (synchronicportion) when this display unit comprises tool a pair further, one signal amplifying apparatus (amplificationportion), the signal conversion part that one simulating signal turns digital signal divides (conversionportion), one visualization portion (displayportion), via the signal analyzed from magnetic field producer and magnetic flux measuring unit, present the result of real-time magnetic flux density change.But the device of this measurement magnetic flux is used for magnetic flux to be measured, and cannot go out ac permeability and magnetic phase is poor via this measurement device.
Magnetic permeability (magneticpermeability) measurement mechanism and for example disclosed by US publication 20090102458, reciprocation can be produced with this magnetic field when magnetic material is placed under magnetic environment, though this device can measure the magnetic permeability that magnetic material produces, this device can not measure magnetic phase difference, the real part of ac permeability and imaginary values.And device of the present invention is compared with the permeability measurement device disclosed by US publication 20090102458, except the magnetic permeability intensity can measuring test substance and phase differential, calculate ac permeability real part and imaginary values further, then the ac permeability variation relation at different frequencies of test substance can be measured further.
For another example U.S. Publication patent 7, 541, 805 1 kinds of magnetic characteristic measuring systems comprising superconductive quantum interference assembly, when sample to be tested is placed in AC magnetic field, superconductive quantum interference assembly can detect the magnetic flux change that superconduction pick-up winding produces, then an AC signal is exported, this signal comprises solid part signal and imaginary signals, if time inconsistent with the signal of reference voltage, this real part can be separated improperly with imaginary signals, and learn that this measurement result must through phase place adjustment to reduce error, therefore although the signal of this measuring system comprises solid part signal and imaginary signals, but only need to enter horizontal phasing control further for judging whether, its object is to reduce its phase differential, make measurement result more accurate, this known devices also fails to measure magnetic permeability intensity and phase differential variation relation at different frequencies, and the numerical value of ac permeability real part and imaginary part cannot be obtained via this device.Moreover U.S. Publication patent 7,541,805 use magnetic characteristic measuring system containing superconductive quantum interference assembly, it involves great expense, and operating conditions is harsh, be only applicable to precision instrument room, be not suitable for the elementary purposes not having the industrial community of precision instrument room or general educational circles.And device of the present invention and U.S. Publication patent 7,541, the magnetic characteristic measuring system of the superconductive quantum interference assembly disclosed by 805 is compared, except the magnetic permeability intensity can measuring test substance and phase differential, calculate ac permeability real part and imaginary values further, then the ac permeability variation relation at different frequencies of test substance can be measured further.
The present invention utilizes the ac permeability coil groups of a simple structure, can overcome as front case U.S. Publication patent 6,683,452 and the above-mentioned shortcoming (magnetic permeability intensity and phase differential, ac permeability real part and the imaginary values of test substance cannot be measured, the ac permeability variation relation at different frequencies of test substance) of US publication 20090102458.In addition, the present invention also overcomes as U.S. Publication patent 7,541 simultaneously, and 805 grades need involve great expense, and operating conditions is harsh, are only applicable to the shortcoming of precision instrument room.
Summary of the invention
An object of the present invention is to provide a kind of ac permeability measurement mechanism, in order to carry out measuring the ac permeability intensity of test substance in AC magnetic field or phase differential change.
Another object of the present invention is to provide a kind of ac permeability measurement mechanism containing ac permeability coil groups, in order to measure test substance ac permeability intensity or phase differential in AC magnetic field.
Another object of the present invention is to provide a kind of ac permeability measurement mechanism, in order to measure the ac permeability change of a test substance in the AC magnetic field providing different frequency.
Another object of the present invention is to provide a kind of ac permeability measurement mechanism, in order to measure a test substance providing in different frequency AC magnetic field, the real part of its ac permeability and the change of imaginary part.
Another object of the present invention is to provide a kind of and measure the ac permeability strength signal of test substance and the ac permeability measuring method of phase signal.
Another object again of the present invention is to provide a kind of ac permeability measuring method measuring the real part of the ac permeability of test substance and the change of imaginary part.
Another object of the present invention is to provide a kind of ac permeability measuring method measuring the ac permeability change of test substance in the AC magnetic field of different frequency.
For reaching above-mentioned purpose, actualizing technology of the present invention is as follows:
A kind of ac permeability measurement mechanism, it comprises:
One function generator of more vairable, in order to produce ac signal;
One ac permeability coil groups, it at least comprises:
One excitation variable winding, in order to connect this function generator of more vairable, and changes according to the ac signal of this function generator of more vairable, produces AC magnetic field; And
One pick-up winding, changes in order to pick up determinand because of the AC magnetic field of this excitation variable winding the interchange magnetic conductance signal responded to;
One signal acquisition unit, in order to capture the interchange magnetic conductance signal that this pick-up winding captures; And
One signal processing unit, in order to process from the ac permeability signal of this signal acquisition unit, and calculates ac permeability intensity and phase differential, and/or the value of real part of ac permeability and imaginary values.
The above-mentioned function generator of more vairable, it can be the function generator of more vairable known arbitrarily, such as domestic
gWinstek electronics industry stock part company limitedthe SFG-1000 array function generator that (GoodWillInstrumentCo., Ltd) produces, the product SRSDS335 etc. of U.S. StanfordResearchSystems, Inc..
Above-mentioned excitation variable winding, it can be any suitable commercially available coil, such as He Muhuozi coil; Or homemade excitation variable winding is as solenoid coil etc., during this self-control excitation variable winding, applicable material manufacture known arbitrarily can be adopted, such as, first with plastic-steel material processing, periphery again through copper cash around, excitation variable winding.
The above-mentioned excitation variable winding of this ac permeability coil groups and the connected mode of this function generator of more vairable can be electrical connection, such as excitation variable winding is connected to the function generator of more vairable, or the excitation variable winding that function generator of more vairable excitation variable winding is connected to, produce an AC magnetic field in order to make this excitation variable winding.
Above-mentioned pick-up winding can be homemade pick-up winding, or pick-up winding known arbitrarily, is better with gradient type coil or faraday's coil.
This pick-up winding above-mentioned, relative to this this excitation variable winding position, for producing arbitrarily the relative position of induction smoothly, but is positioned at this this excitation variable winding central authorities for better with pick-up winding, being coaxially better.
This signal acquisition unit above-mentioned can be signal acquisition unit known arbitrarily, such as the product NIPCI-6221 of US business's National Instruments incorporated company (NationalInstruments).
This signal processing unit above-mentioned can be the signal processing unit of software, firmware or hardware type, is better with software or firmware.For strengthening the processing power of time-domain signal and spectrum signal, be better to contain fast fourier transform program.
Above-mentioned ac permeability measurement mechanism, a signal amplification circuit can be comprised further, after the output signal of pick-up winding is amplified, captured by signal acquisition unit again, to promote the acquisition sensitivity of tiny signal, finally by signal processing unit, this interchange magnetic conductance signal is converted to spectrum signal and exports.This signal amplification circuit can be signal amplification circuit known arbitrarily, is better with the signal amplification circuit of adjustable enlargement ratio.Again, this signal amplification circuit also can directly and this signal acquisition unit form a single circuit.
The measurement result of above-mentioned ac permeability measurement mechanism, can be stored in internal memory, storage device, or is directly shown on display, therefore this ac permeability measurement mechanism can comprise a display unit further, in order to show measurement, and/or a storage element, in order to store measurement result.Certainly, also measurement result can be stored in external storage device, or be shown in external display device.
Above-mentioned ac permeability measurement mechanism, the bleeder circuit that one is coupled in ac permeability coil groups can be comprised further, wherein this bleeder circuit is connected to the pick-up winding of this AC magnetism loop group, the impact that the AC magnetic field produced in order to eliminate this excitation variable winding outputs signal this pick-up winding, and this output signal can be captured by this signal acquisition unit again, finally by this signal processing unit, this interchange magnetic conductance signal is converted to spectrum signal and exports.
Again, the laboratories such as general motor/electronics/physics/material, mostly have the function generator of more vairable, and therefore, for coordinating these situations, another ac permeability measurement mechanism of the present invention is one can the ac permeability measurement mechanism of the external function generator of more vairable, and it comprises:
One ac permeability coil groups, it at least comprises:
One excitation variable winding, in order to an external function generator of more vairable, and then produces AC magnetic field according to the ac signal of this external function generator of more vairable; And
One pick-up winding, changes in order to pick up determinand because of the AC magnetic field of this excitation variable winding the interchange magnetic conductance signal responded to;
One signal acquisition unit, in order to capture the interchange magnetic conductance signal that this pick-up winding captures; And
One signal processing unit, in order to process from the ac permeability signal of this signal acquisition unit, and calculates ac permeability intensity and phase differential, and/or the value of real part of ac permeability and imaginary values.
This excitation variable winding above-mentioned, pick-up winding, signal acquisition unit, signal processing unit are all as aforementioned, and its connection relationship is also as aforementioned.
Above-mentioned external function generator of more vairable formula ac permeability measurement mechanism is also as aforementioned, and to contain signal amplification circuit and/or bleeder circuit further, its function and mode of connection are as aforementioned.
The present invention comprises a kind of measuring method of ac permeability simultaneously, and this measuring method comprises:
One ac permeability measuring process, in order to the interchange magnetic conductance signal of the interchange magnetic conductance signal and tester of measuring determinand respectively;
One first signal switch process, in order to this determinand measured by this ac permeability measuring process to be exchanged magnetic conductance signal and tester interchange magnetic conductance signal, converts the spectrum signal of determinand and the spectrum signal of tester to respectively;
One secondary signal switch process, in order to by this determinand spectrum signal of this first signal switch process conversion gained and tester spectrum signal, converts determinand time-domain signal and tester time-domain signal to respectively;
One subtraction step, it carries out subtraction, to obtain the time-domain signal difference of this determinand to this determinand time-domain signal of this secondary signal switch process conversion gained and tester time-domain signal;
One difference switch process, it converts the time-domain signal difference of this determinand the spectrum signal of this determinand to; And
One time domain signal difference exports step, in order to this time-domain signal difference to be exported;
Wherein, the execution sequence of this ac permeability measuring process, the first signal switch process, secondary signal switch process can be and sequentially performs or staggered execution.
Above-mentioned so-called tester, generally speaking refers to air, certainly also according to need, can make specific tester into, such as specific gas.
In above-mentioned ac permeability measuring process, measure interchange magnetic conductance signal and the order exchanging magnetic conductance signal of tester of determinand, there is no a definite limitation.
In above-mentioned first signal switch process, convert the interchange magnetic conductance signal of this determinand to spectrum signal, convert spectrum signal to by the magnetic conductance signal that exchanges of this tester, its order does not have a definite limitation.
In above-mentioned secondary signal switch process, convert the spectrum signal of this determinand to time-domain signal, and convert the spectrum signal of this tester to time-domain signal, its order does not have a definite limitation.
The execution sequence of this ac permeability measuring process of above-mentioned what is called, the first signal switch process, secondary signal switch process can be and sequentially performs, after referring to that ac permeability measuring process executes, perform the first signal switch process again, after executing the first signal switch process, then perform secondary signal switch process.
The execution sequence of this ac permeability measuring process of above-mentioned what is called, the first signal switch process, secondary signal switch process can be staggered execution, for ac permeability measuring process, the staggered execution of the first signal switch process, when referring to that ac permeability measuring process performs a part of, just perform a part for the first signal switch process, such as, after measuring the ac permeability of determinand, just convert the ac permeability of this determinand to spectrum signal, then measure the ac permeability of tester again, and convert the ac permeability of this tester to spectrum signal; Certainly wherein the order of determinand and tester can be exchanged, that is after the ac permeability of measurement tester, just convert the ac permeability of this tester to spectrum signal, then measure the ac permeability of determinand again, and convert the ac permeability of this determinand to spectrum signal.
In like manner, can know the interlock mode that performs of the first signal switch process and secondary signal switch process by inference is that the first signal switch process is when performing a part of, just perform a part for secondary signal switch process, such as, after converting the ac permeability of determinand to spectrum signal, just convert the spectrum signal of this determinand to time-domain signal, then convert the ac permeability of tester to spectrum signal again, and convert the spectrum signal of this tester to time-domain signal; Certainly wherein the order of determinand and tester can be exchanged, also after converting spectrum signal to by the ac permeability of tester, just convert the spectrum signal of this tester to time-domain signal, then convert the ac permeability of determinand to spectrum signal again, and convert the spectrum signal of this determinand to time-domain signal.
Know this skill personage all to be known by inference by the inventive method: the execution sequence of the first signal switch process and secondary signal switch process, also can be parallel execution, such as adopt double-core technology, utilize a wherein core to perform the first signal switch process and the secondary signal switch process of determinand, another core performs the first signal switch process and the secondary signal switch process of tester.
The execution sequence of above-mentioned so-called ac permeability measuring process, the first signal switch process, secondary signal switch process can be and sequentially performs or staggered execution, finger can completely sequentially perform, interlocking completely to perform or partly sequentially perform partly to interlock performs, and it is better for performing to interlock completely.
The completely staggered execution of above-mentioned what is called refers to: after sequentially performing ac permeability measuring process, the first signal switch process, secondary signal switch process to determinand, again ac permeability measuring process, the first signal switch process, secondary signal switch process are sequentially performed, see Fig. 9 and explanation thereof to tester; Or after ac permeability measuring process, the first signal switch process, secondary signal switch process are sequentially performed to tester, again ac permeability measuring process, the first signal switch process, secondary signal switch process are sequentially performed, see Figure 10 and explanation thereof to determinand.
The above-mentioned so-called part that partly sequentially performs interlocks executive mode such as: after performing ac permeability measuring process, then interlock execution first signal switch process and secondary signal switch process; Interlock after performing ac permeability measuring process and the first signal switch process, then perform secondary signal switch process.
According to the measuring method of ac permeability of the present invention, can in sequentially or staggered perform ac permeability measuring process, the first signal switch process, secondary signal switch process after, the time-domain signal of the time-domain signal of this determinand and tester is carried out subtraction again, to obtain the time-domain signal difference of this determinand; The last spectrum signal difference converting this determinand again to exports.
For making the measurement mechanism of ac permeability of the present invention and method and other object above-mentioned, feature and effect become apparent, hereby via following specific embodiment, and coordinate appended by graphic, the present invention one is described in detail as follows.
Accompanying drawing explanation
Fig. 1 is ac permeability measurement mechanism one preferred embodiment schematic diagram of the present invention.
The AC magnetism loop group structure that Fig. 2 is preferred embodiment shown in Fig. 1 and test substance relative position icon.
Fig. 3 is another ac permeability measurement mechanism configuration diagram of the invention process aspect.
Fig. 4 is the another ac permeability measurement mechanism configuration diagram according to the invention process aspect.
Fig. 5 is the ac permeability measurement mechanism configuration diagram again according to the invention process aspect.
Fig. 6 be according to the pick-up winding of the invention process aspect with bleeder circuit in conjunction with schematic diagram.
Fig. 7 is a kind of ac permeability measuring method process flow diagram according to the invention process aspect.
Fig. 8 is another the ac permeability measuring method process flow diagram according to the invention process aspect.
Fig. 9 is the another ac permeability measuring method process flow diagram according to the invention process aspect.
Figure 10 is ac permeability intensity and the phase place of the detecting variable concentrations magnetic fluid of foundation the invention process aspect, with the variation relation figure of externally-applied magnetic field frequency.
Figure 11 is the phase differential graph of a relation between the detecting magnetic fluid magnetic dipole of foundation the invention process aspect and externally-applied magnetic field.
Figure 12 is according to the detecting magnetic fluid magnetic permeability real part of the invention process aspect and the imaginary part variation relation figure with externally-applied magnetic field frequency.
Primary clustering symbol description:
100: test substance
200: the function generator of more vairable
300: ac permeability coil groups
300a: pick-up winding
300b: excitation variable winding
400: signal acquisition unit
500: signal processing unit
600: bleeder circuit
700: amplifying circuit
Embodiment
According to a specific embodiment of ac permeability measurement mechanism of the present invention, refer to Fig. 1, for the measurement mechanism schematic diagram of the ac permeability of the invention process aspect, via the function generator of more vairable (200) be built in in this ac permeability measurement mechanism, there is provided an alternating voltage to ac permeability coil groups (300), make there is alternating current conducting in this ac permeability coil groups (300), and then produce AC magnetic field in this ac permeability coil groups (300).After being placed in by material for measuring in this ac permeability coil groups (300), the AC magnetic field in this ac permeability coil groups (300) can change thereupon, and produces an ac permeability signal.The above-mentioned ac permeability signal from ac permeability coil groups (300) can capture to signal processing unit (500) through signal acquisition unit (400) again, and via the converting system in this signal processing unit (500), as fourier transform hardware, fourier transform software or fourier transform firmware etc. are changed, the ac permeability signal of the material that this wish is measured is converted to ac permeability intensity and phase differential, and this ac permeability strength signal can be represented the real part and imaginary values that exchange magnetic conductance with ac permeability solid part signal and ac permeability imaginary signals further.In addition, through the alternating current voltage frequency that the change function generator of more vairable (200) exports, can the magnetic permeability of measurement of species in the magnetic field of varying strength, set up the graph of a relation between the ac permeability of material and externally-applied magnetic field frequency that this wish measures further, and the signal that this processes can be exported to exterior display device such as personal computer, LCD screen or TV and present.
The AC magnetism loop group structural representation that Fig. 2 is preferred embodiment shown in Fig. 1, containing a test substance (100) in figure, first can this test substance (100) be placed in ac permeability coil groups (300), pick-up winding (300a) in this ac permeability coil groups (300) is gradient type faraday coil, it uses plastic-steel material to make body, again with copper cash around forming, body can be divided into two sections around direction phase reverse-forming, and this pick-up winding (300a) and with since capture test substance (100) ac permeability signal, and this pick-up winding (300a) periphery coated one deck excitation variable winding (300b) again, this excitation variable winding (300b) for plastic-steel material process its periphery again through copper cash around forming, this excitation variable winding (300b) can be connected to the function generator of more vairable (200), an AC magnetic field is produced in order to make this excitation variable winding (300b), this ac permeability signal penetrates the planar magnetic flux that pick-up winding (300a) surrounds, cyclical variation can be done in time, make this pick-up winding (300a) with generation one periodic AC voltage, and the product of the amplitude size of this alternating voltage is proportional to interchange change frequency and AC magnetic signal size, therefore the voltage that can export via this pick-up winding (300a) and learn the ac permeability signal that test substance (100) produces under known a-c cycle.
According to a specific embodiment of ac permeability measurement mechanism of the present invention, refer to Fig. 3, for another measurement mechanism schematic diagram of the ac permeability of the invention process aspect, via an external power source, as AC power supply such as the function generators of more vairable (200), there is provided an alternating voltage to ac permeability coil groups (300), make there is alternating current conducting in this ac permeability coil groups (300), and then produce AC magnetic field in this ac permeability coil groups (300).This test substance (100) above-mentioned is placed in this ac permeability coil groups (300).The above-mentioned interchange magnetic conductance signal from ac permeability coil groups (300) can capture to signal processing unit (500) through signal acquisition unit (400) again, via the converting system in this signal processing unit (500), as fourier transform hardware, fourier transform software or fourier transform firmware etc. are changed, the ac permeability signal of this test substance (100) is made to be converted to ac permeability intensity and phase differential, and this ac permeability strength signal can be represented the real part and imaginary values that exchange magnetic conductance with ac permeability solid part signal and ac permeability imaginary signals further.In addition, through the alternating current voltage frequency that the change function generator of more vairable (200) exports, the magnetic permeability of this test substance (100) in the magnetic field of varying strength can be measured, set up the graph of a relation between test substance (100) ac permeability and externally-applied magnetic field frequency further, and the signal that this processes can be exported to exterior display device such as personal computer, LCD screen or TV and present.
Continue the above embodiments, as shown in Figure 4, for the another measurement mechanism schematic diagram of the ac permeability of the invention process aspect, via a power supply, as AC power supply such as the function generators of more vairable (200), there is provided an alternating voltage to ac permeability coil groups (300), make there is alternating current conducting in this ac permeability coil groups (300), and then produce AC magnetic field in this ac permeability coil groups (300).This test substance (100) above-mentioned is placed in this ac permeability coil groups (300), because being subject to the effect of AC magnetic field, this test substance (100) can be excited generation one ac permeability signal, the periodic AC voltage that can export via the pick-up winding of ac permeability coil groups (300) (300a) and learn the ac permeability signal that test substance (100) produces under known a-c cycle, as front taken off the explanation of Fig. 3, and for eliminating the impact that the AC magnetic field that produced by excitation variable winding (300b) outputs signal pick-up winding (300a), therefore the pick-up winding (300a) of this enforcement aspect is connected to a bleeder circuit (600) further, by the alternating voltage that pick-up winding (300a) exports, after bleeder circuit (600), capture to signal processing unit (500) through signal acquisition unit (400) again, via the converting system in this signal processing unit (500), as fourier transform hardware, fourier transform software or firmware, can be undertaken transferring spectrum signal to by through the instantaneous voltage signal of signal acquisition unit (400) acquisition to signal processing unit (500), enter again with numerical analysis in this ac permeability coil groups (300) the real part of interchange magnetic conductance of test substance (100) and the relation of imaginary part size or ac permeability intensity and phase differential under generation a-c cycle, through changing the different alternating current voltage frequencies exported by the function generator of more vairable (200), the graph of a relation between test substance (100) ac permeability and externally-applied magnetic field frequency can be set up further, and can the signal that this processes be exported to exterior display device as personal computer, LCD screen or TV present.
According to another specific embodiment of the measurement mechanism of ac permeability of the present invention, as shown in Figure 5, for the present invention one ac permeability measurement mechanism, via a power supply, as AC power supply such as the function generators of more vairable (200), there is provided an alternating voltage to ac permeability coil groups (300), to make there is alternating current conducting in ac permeability coil groups (300), and then produce AC magnetic field in ac permeability coil groups (300).Be placed in by one test substance (100) in this ac permeability coil groups (300), because being subject to the effect of AC magnetic field, this test substance (100) can be initiated the signal producing ac permeability.And for eliminating the impact that the AC magnetic field that produced by excitation variable winding (300b) outputs signal pick-up winding (300a), therefore as the explanation of Fig. 4 enforcement aspect, this pick-up winding (300a) is linked to a bleeder circuit (600), by the alternating voltage that this pick-up winding (300a) exports, after bleeder circuit (600), output voltage through bleeder circuit (600) is further inputed to signal amplification circuit (700) by this enforcement aspect, to increase noise ratio, again through signal acquisition unit (400), by signal acquisition to signal conversion unit as fourier transform hardware, fourier transform software or firmware, interchange magnetic conductance signal is made to transfer spectrum signal to, under analyzing different a-c cycle, test substance (100) exchanges the real part of magnetic conductance and the variation relation of imaginary part size or ac permeability intensity and phase differential, and can by this variation relation, present through additional display device, this exterior display device is as personal computer, LCD screen or TV.
Continue the above embodiments, Fig. 6 can further illustrate in above-described embodiment, the connection relation of the pick-up winding (300a) in this ac permeability measurement mechanism in bleeder circuit (600) and ac permeability coil groups (300), as as shown in Fig. 3 illustrates, this pick-up winding (300a) is made up of multistage coil, this pick-up winding (300a) is gradient type faraday coil, it uses plastic-steel material to make body, again with copper cash around forming, body can be divided into two sections around direction phase reverse-forming, a resistance to bleeder circuit (600) and a variable resistor is respectively connected in series respectively at the two sections of this gradient type faraday coil, and the resistance used in figure is 5k Ω, variable resistor is 100 Ω, this bleeder circuit (600) can use resistance and the tandem of different nurse value difficult to understand, be not limited with this embodiment.When test substance (100) is placed in ac permeability coil groups (300), because being subject to the effect of AC magnetic field, this test substance (100) can be excited and produce the signal of ac permeability, and convert this ac permeability signal to ac voltage signal by pick-up winding (300a), this ac voltage signal is by after bleeder circuit (600), the dividing potential drop capturing each resistance is subtracted each other, the impact that the AC magnetic field produced by excitation variable winding (300b) in order to elimination outputs signal pick-up winding (300a), finally by the A by bleeder circuit (600), B two ends output voltage.
As shown in Figure 7, for measuring the method for measurement of the ac permeability of test substance (100) according to the one of the invention process aspect.First, ac permeability signal measurement step (S714) when carrying out without the ac permeability signal measurement step (S710) time test substance (100) at one time and insert test substance (100), ac permeability signal when obtaining without ac permeability signal time test substance (100) and insert test substance (100); Continue again and carry out step (S711) and (S715), be spectrum signal by above-mentioned ac permeability signal through fast fourier transform, and produce without magnetic permeability intensity χ time test substance (100) in step (S712) and (S716)
o, air, without phase difference time test substance (100)
air, magnetic permeability intensity χ when inserting test substance (100)
o, mixwith phase difference when inserting test substance (100)
mix.Then continue and carry out next step (S713) and (S717), will without magnetic permeability intensity χ time test substance (100)
o, air, without phase difference time test substance (100)
air, magnetic permeability intensity χ when inserting test substance (100)
o, mixwith phase difference when inserting test substance (100)
mixconvert time-domain signal to.Again following by step (S713) gained without time-domain signal time test substance (100) and step (S717) gained insert test substance (100) after time-domain signal carry out subtraction, as step (S718), the time-domain signal difference of a test substance (100) can be obtained, and carry out fast fourier transform.Finally, carry out next step (S719), produce the magnetic permeability intensity χ of test substance (100)
o, sampleand phase difference
sample, and according to the amplitude of the magnetic permeability measured and the ac permeability strength signal value of real part and the ac permeability imaginary signals that calculate this test substance (100) relative to the phasometer of externally-applied magnetic field.
As shown in Figure 8, for measuring the method for measurement of the ac permeability of test substance (100) according to the another kind of the invention process aspect, first carry out step (S810), measure the ac permeability without test substance (100); Then be spectrum signal without ac permeability signal time test substance (100) through fast fourier transform by this in step (S811), and in producing a magnetic permeability intensity χ at next step (S812)
o, airand phase difference
air; Carry out time-domain spectral switch process (S813) afterwards, convert this to time-domain signal without spectrum signal time test substance (100).
Until above-mentioned complete without ac permeability signal measurement step time test substance (100) after, continue and carry out step (S814), insert test substance (100) and measure its ac permeability; Then carrying out step (S815), is spectrum signal by this ac permeability signal through fast fourier transform, and produces a magnetic permeability intensity χ in next step (S816)
o, mixand phase difference
mix; Carry out time-domain spectral switch process (S817) afterwards, the spectrum signal of this being inserted after test substance (100) converts time-domain signal to.
Again following by step (S813) gained without time-domain signal time test substance (100) and step (S817) gained insert test substance (100) after time-domain signal carry out subtraction, as step (S818), a test substance (100) time-domain signal difference can be obtained, and carry out fast fourier transform.Finally, then carry out next step (S819), produce the magnetic permeability intensity χ of test substance (100)
o, sampleand phase difference
sample, and according to the amplitude of the magnetic permeability measured and the ac permeability strength signal value of real part and the ac permeability imaginary signals that calculate this test substance (100) relative to the phasometer of externally-applied magnetic field.
As shown in Figure 9, for measuring the method for measurement of the ac permeability of test substance (100) according to the another kind of the invention process aspect, first measurement step (S914), inserts test substance (100) and measures its ac permeability; Then carrying out step (S915), is spectrum signal by this ac permeability signal through fast fourier transform, and produces a magnetic permeability intensity χ in next step (S916)
o, mixand phase difference
mix; Carry out time-domain spectral switch process (S917) afterwards, the spectrum signal of this being inserted after test substance (100) converts time-domain signal to.
Until above-mentioned insert test substance (100) time ac permeability signal measurement step complete after, continue and this test substance (100) removed and carries out step (S910), measure ac permeability; Then be spectrum signal without ac permeability signal time test substance (100) through fast fourier transform by this in step (S911), and in producing a magnetic permeability intensity χ at next step (S912)
o, airand phase difference
air; Carry out time-domain spectral switch process (S913) afterwards, convert this to time-domain signal without spectrum signal time test substance (100).
Again following by step (S917) gained insert test substance (100) after time-domain signal and step (S913) gained carry out subtraction without time-domain signal time test substance (100), as step (S918), the territory signal difference of a test substance (100) can be obtained, and carry out fast fourier transform.Finally, then carry out next step (S919), produce the magnetic permeability intensity χ of test substance (100)
o, sampleand phase difference
sample, and according to the amplitude of the magnetic permeability measured and the ac permeability strength signal value of real part and the ac permeability imaginary signals that calculate this test substance (100) relative to the phasometer of externally-applied magnetic field.
According to ac permeability measuring equipment and the method for measurement of the invention described above, the measurement experimental example of one magnetic fluid is provided, only the state of the measurable test substance of the present invention (100) and the kind of test substance are not limited to this, and namely the magnetic of solid-state, liquid, gaseous state and non-magnetic material all can utilize ac permeability measuring equipment of the present invention to measure its ac permeability.
The magnetic fluid of the different magnetic concentration of this experimental measurement, its magnetic permeability is with the change behavior of externally-applied magnetic field frequency.The magnetic fluid taken is keryl, and concentration is respectively 6.0emu/g, 3.6emu/g, 2.0emu/g and 1.2emu/g.Via ac permeability measuring equipment of the present invention, measure the ac permeability intensity of these four kinds of concentration magnetic fluids and the phase place variation relation figure with externally-applied magnetic field frequency, as shown in Figure 10, wherein, the top figure as Figure 10 is the ac permeability intensity (χ of the magnetic fluid of four kinds of concentration
o) variation relation of Sui's externally-applied magnetic field frequency, below figure is the variation relation of the phase differential (θ) between magnetic fluid magnetic dipole and externally-applied magnetic field with externally-applied magnetic field frequency, shown phase differential (θ) is negative, this represents magnetic fluid magnetic dipole (M) direction, all inconsistent with externally-applied magnetic field (H) direction, and be lag behind externally-applied magnetic field, as shown in figure 11.
In addition, according to the experimental example of above-mentioned actual measurement magnetic fluid, the change with externally-applied magnetic field frequency of actual measurement magnetic fluid magnetic permeability real part and imaginary part can be recorded.And as shown in figure 12, the ac permeability real part (Re [χ of the magnetic fluid of these four kinds of concentration can be distinguished
ac, o]) and imaginary part (Im [χ
ac, o]) with the variation relation figure of externally-applied magnetic field frequency.
After the every preferred embodiment describing the invention described above in detail, being familiar with this technology personage can clearly understand, and not departing under claims and spirit and can carrying out various change and change, is not also limited to the embodiment of the embodiment of instructions.
Claims (13)
1. an ac permeability measurement mechanism, it comprises an ac permeability coil groups, a bleeder circuit, a signal acquisition unit and a signal processing unit, wherein:
This ac permeability coil groups at least comprises:
One excitation variable winding, in order to an external function generator of more vairable, and changes according to the ac signal of this function generator of more vairable, produces AC magnetic field; And
One pick-up winding, changes in order to pick up determinand because of the AC magnetic field of this excitation variable winding the interchange magnetic conductance signal responded to;
This bleeder circuit is coupled in the pick-up winding of ac permeability coil groups;
The interchange magnetic conductance signal that this signal acquisition unit captures in order to capture this pick-up winding;
This signal processing unit from the ac permeability signal of this signal acquisition unit, and calculates ac permeability intensity and phase differential in order to process, and/or the value of real part of ac permeability and imaginary values.
2. ac permeability measurement mechanism as claimed in claim 1, this ac permeability coil groups comprises at least one input port further, in order to the external function generator of more vairable.
3. ac permeability measurement mechanism as claimed in claim 1, this signal processing unit comprises a fast fourier transform processing hardware or fast Flourier process software further, to change the signal from this signal acquisition unit.
4. ac permeability measurement mechanism as claimed in claim 1, this signal processing unit comprises a fast fourier transform process firmware further, to change the signal from this signal acquisition unit.
5. ac permeability measurement mechanism as claimed in claim 1, wherein this excitation variable winding is solenoid coil or He Muhuozi coil.
6. ac permeability measurement mechanism as claimed in claim 1, wherein this pick-up winding is gradient type coil or faraday's formula coil.
7. ac permeability measurement mechanism as claimed in claim 1, this ac permeability measurement mechanism comprises a signal amplification circuit further, and this signal amplification circuit is serially connected with between this ac permeability coil groups and this signal acquisition unit.
8. an ac permeability measurement mechanism, it comprises a function generator of more vairable, an ac permeability coil groups, a bleeder circuit, a signal acquisition unit and a signal processing unit, wherein:
This function generator of more vairable is in order to produce ac signal;
This ac permeability coil groups at least comprises:
One excitation variable winding, changes in order to the ac signal according to this function generator of more vairable, produces AC magnetic field; And
One pick-up winding, changes in order to pick up determinand because of the AC magnetic field of this excitation variable winding the interchange magnetic conductance signal responded to;
This bleeder circuit is coupled in the pick-up winding of ac permeability coil groups;
The interchange magnetic conductance signal that this signal acquisition unit captures in order to capture this pick-up winding;
This signal processing unit from the ac permeability signal of this signal acquisition unit, and calculates ac permeability intensity and phase differential in order to process, and/or the value of real part of ac permeability and imaginary values.
9. ac permeability measurement mechanism as claimed in claim 8, this signal processing unit comprises a fast fourier transform processing hardware or fast Flourier process software further, to change the signal from this signal acquisition unit.
10. ac permeability measurement mechanism as claimed in claim 8, comprises a fast fourier transform process firmware, further to change the signal from this signal acquisition unit.
11. ac permeability measurement mechanisms as claimed in claim 8, wherein this excitation variable winding is solenoid coil or He Muhuozi coil.
12. ac permeability measurement mechanisms as claimed in claim 8, wherein this pick-up winding is gradient type coil or faraday's formula coil.
13. ac permeability measurement mechanisms as claimed in claim 7, wherein this ac permeability measurement mechanism comprises a signal amplification circuit further, and this signal amplification circuit is serially connected with between this ac permeability coil groups and this signal acquisition unit.
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|---|---|---|---|---|
| US5311125A (en) * | 1992-03-18 | 1994-05-10 | Lake Shore Cryotronics, Inc. | Magnetic property characterization system employing a single sensing coil arrangement to measure AC susceptibility and DC moment of a sample |
| US6477398B1 (en) * | 1997-11-13 | 2002-11-05 | Randell L. Mills | Resonant magnetic susceptibility imaging (ReMSI) |
| CN200989923Y (en) * | 2006-06-24 | 2007-12-12 | 江苏省晶石磁性材料与器件工程技术研究有限公司 | AC DC superposed magnetic performance testing device |
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| US20090102473A1 (en) * | 2007-10-22 | 2009-04-23 | Soshi Narishige | Eddy current testing method and eddy current testing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311125A (en) * | 1992-03-18 | 1994-05-10 | Lake Shore Cryotronics, Inc. | Magnetic property characterization system employing a single sensing coil arrangement to measure AC susceptibility and DC moment of a sample |
| US6477398B1 (en) * | 1997-11-13 | 2002-11-05 | Randell L. Mills | Resonant magnetic susceptibility imaging (ReMSI) |
| CN200989923Y (en) * | 2006-06-24 | 2007-12-12 | 江苏省晶石磁性材料与器件工程技术研究有限公司 | AC DC superposed magnetic performance testing device |
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