CN103353614A - Measuring system and measuring method of magnetic parameters in continuous temperature - Google Patents
Measuring system and measuring method of magnetic parameters in continuous temperature Download PDFInfo
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- CN103353614A CN103353614A CN201310229264XA CN201310229264A CN103353614A CN 103353614 A CN103353614 A CN 103353614A CN 201310229264X A CN201310229264X A CN 201310229264XA CN 201310229264 A CN201310229264 A CN 201310229264A CN 103353614 A CN103353614 A CN 103353614A
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Abstract
The invention discloses a measuring system and a measuring method of magnetic parameters in continuous temperature. The measuring system comprises: a sample chamber (1), a computer (2), a signal measurement and acquisition system (3), a machine driven system (4), a temperature control system (5), an air-flow conveying system (6), a thermal insulation portion (7), a magnetic shielding device (8) and a magnetic field control system (9), wherein the signal measurement and acquisition system (3) and the machine driven system (4) complete the measurement and acquisition of a plurality of magnetic parameters collaboratively; the temperature control system (5) and the air-flow conveying system (6) perform precise temperature control on a sample (10) collaboratively; the magnetic shielding device (8) is used for providing a lower magnetostatic environment; the magnetic field control system (9), after reaching a pre-set temperature, is for loading a predetermined magnetic field; and the computer (2)controls each part of the system to work collaboratively.
Description
Technical field
The invention belongs to archeo magnetism Magnetic Measurement field, be specifically related to a kind of continuous temperature magnetic parameter measuring system and measuring method.
Background technology
The motion of earth's core inner fluid is originated from the magnetic field of the earth, the be richly stored with information of earth interior dynamic process of its variation.The research of earth history earth magnetic field intensity in period variation characteristic provides important condition for finally setting up geodynamic models.Therefore, from rock, sample and the hot demagnetizing method by archaeomagnetism obtains the paleointensity data, just have very important significance of scientific research.Can say that rock sample is the encrypt file that has recorded important information, and the process of decoding these files is exactly the process that archaeomagnetism obtains the paleointensity data.Yet, because the magnetic field of the earth paleointensity is measured related theory and experiment is more more complex to measuring than ancient prescription, at present the paleointensity data than ancient prescription to the data much less, so that people are difficult to full appreciation earth history geomagnetic field variation in period.And then hindered the physical process of utilizing the magnetic field of the earth to explore earth interior.
And why the paleointensity data volume is less, first because sample is complicated from collecting the link of making, exist the influence factor of many unknowns, second be because the test job more complicated of sample, need on the temperature spot that heats gradually, constantly repeat heat demagnetization and measurement of residual magnetism, usually flow process is as follows: sample puts into heating furnace-be heated to 100 and spend-cool off-put into measuring system-measurements, and---sample puts into heating furnace-be heated to 200 and spend-cool off-put into measuring system-measurement, and--------sample put into heating furnace-be heated to 300 and spend-cool off-put into measuring system-measurement--circulates with this, until add extremely required maximum temperature of thermal measurement.Again the data of each temperature spot are carried out curve fitting afterwards, then carry out the data analysis in the field, thus surveying work extremely to consume power time-consuming, and the demagnetizing curve that uses a small amount of heating-up temperature point to simulate is also accurate not.And the second portion reason also is one of bottleneck of the whole archeo magnetism of restriction field development.Take Inst of Geology and Geophysics, Chinese Academy of Sciences archeo magnetism laboratory as example, whole experimentation just must carry out at FP-PTSD1 heat demagnetization instrument and rock superconductive magnetometer two parts.Use heat demagnetization instrument to divide the temperature section demagnetization to sample, re-use afterwards rock remanent magnetization measuring instrument and carry out Magnetic Measurement.But measuring system is separated with the intensity stove in whole measuring process, can only obtain some the part natural remanent magnetization of determining temperature spot and partial thermoremanent magnetization information, and these temperature spot dispersion degrees are very large, for example above-mentioned 100,200,300 spend, therefore, this data with temperature spot are carried out match and are caused losing of a large amount of temperature section data.And the magnetic mineral saturation magnetization can vary with temperature and change, and the method for only at room temperature measuring residual magnetization has increased the complicacy of paleointensity theory.
Simultaneously, if instrument can be set in arbitrarily temperature spot with the temperature environment of measuring, also be that an important instrument of magnetic fields is improved.Because a lot of magnetics parameters, all be very important magnetics parameter in rock magnetism, environmental magnetism such as SIRM (SIRM), anhysteretic remanent magnetization intensity (ARM) etc., the former refers to the maximum residual magnetization that material is produced by stabilizing magnetic field (being generally 1T) interaction energy under a certain temperature, and is not only relevant with the magnetic mineral type but also relevant with its content; The latter refers in weak constant win stream magnetic field, makes sample stand strong and is reduced to evenly zero the resulting remanent magnetism of action of alternating magnetic field, and is responsive especially to the magnetic-particle of single domain.These magnetics parameters of now are all because the measurement environment of continuous alternating temperature useless, can only add after certain high temperature, be cooled to again indoor temperature measurement, and these parameters all are closely bound up with the variation of temperature, so, the limitation of this instrument has limited the application of these parameters to a great extent, has also increased the complexity that Paleomagnetism Parameters is explained.Comprehensive above reason, the archeo magnetism field is in the urgent need to carrying out at continuous arbitrary temp point the instrument of real-time measurement of residual magnetism.
At present the whole world still do not have can be on the continuous temperature section commercial apparatus of specimen remanent magnetism, only have scientific research institution of France to build laboratory same quasi-instrument on probation.This Instrument Design thinking is for finishing temperature control to sample in inner well heater and the water circulation system used of magnetic shielding device, adopts simultaneously the principle of oscillation sample to finish the collection of magnetic signal.The shortcoming of this mentality of designing is: the one, because well heater all needs energising to heat, and because the electromagnetic conversion principle, the well heater of energising will inevitably produce secondary magnetic field, this secondary magnetic field can't be removed in the inside of shield assembly, again because of its near sample, so can affect greatly the measurement of the magnetic parameter of sample own.The 2nd, what this method for designing adopted is oscillation sample Magnetic Measurement principle, this method need to be under a known magnetic field reciprocating vibration sample, the magnetic field of using afterwards the pick-up winding collected specimens to generate, and then be finally inversed by the remanent magnetism of sample itself.Its shortcoming is that what to measure is a relative quantity, and each measurement all needs to use standard specimen to proofread and correct, and the sensitivity of simultaneously its measurement is not high, can only reach 10
-5Emu compares with high performance fluxgate magnetic core and will hang down an order of magnitude.
Summary of the invention
In order to address the above problem, the invention discloses a kind of continuous temperature magnetic parameter measuring system, comprise: sample cavity, computing machine, signal measurement acquisition system, machine driven system, temperature control system, flow delivery systems, insulating portion, magnetic shielding device and magnetic field control system, the wherein collaborative measurement collection of finishing multiple magnetic parameter of signal measurement acquisition system and machine driven system two parts; Temperature control system and flow delivery systems cooperate with each other and use heated air stream that sample is carried out accurate temperature control; Magnetic shielding device is used for providing a lower magnetostatic environment, the magnetic field control system loads predetermined magnetic field to sample area, the collaborative work of computer control system various piece, can under the alternating temperature state, measure, thereby obtain the multiple magnetic parameter information such as continuous temperature Duan Shangru natural remanent magnetization, SIRM.
Wherein, described signal measurement acquisition system comprises magnetic probe control module, fluxgate magnetic core and data collecting card, wherein the magnetic probe control module provides power supply and signal excitation, the electric signal that the faint magnetic signal that provides probe to detect for data collecting card simultaneously converts to for fluxgate magnetic core.
Wherein, machine driven system comprises that stepper motor drives control card, stepper motor and Double-gear driving turntable, but the operating platform for an automatic rotating sample test of measurement system building angle, the pinion wheel in the nested Double-gear driving turntable of the rotation axis of stepper motor wherein, the pinion wheel motion drives gear wheel and rotates, and gear drive and then the fluxgate magnetic core that drives on the measuring table rotate.
Wherein, temperature control system comprises thermopair, temperature controller and electric heater, wherein, be placed on the temperature that near the thermocouple monitoring sample of sample reaches, computing machine sends temperature control instruction to temperature controller, temperature controller is that the real-time distribution of electric heater will reach the needed heating current of target temperature according to the temperature data of thermopair feedback, heating after the electric heater energising with the air heat that flow delivery systems flows through, is delivered to the sample cavity heated sample.
Wherein, the air-flow transmission system comprises blower fan and air channel, and blower fan is arranged on the bottom of measuring system, with the distance of sample measurement district maintenance more than one meter.
Wherein, the magnetic field control system comprises that programmable power supply and control field coil programmable power supply magnetic field value as requested offer the control field coil of sample area with corresponding electric current, and coil electricity produces magnetic field, finishes the magnetic field control to sample.
Wherein, described insulating portion is the whole double thermal insulation specimen holder that nonmagnetic transparent quartz material is fired, and fills the fire prevention temperature-resistant material in the double-deck quartz wall.
Wherein, described magnetic shielding device comprises that the ultracrystallite material encloses and makes skin, and the internal layer of being made by permalloy.It also can only use wherein a kind of material making.
The invention also discloses the method that adopts above-mentioned continuous temperature magnetic parameter measuring system to measure, comprise the steps:
1) sample is put into sample cavity, and close hatch door, place magnetic shielding device;
2) input on computers the required series of parameters of institute's test sample product;
3) computer control magnetic field control system makes sample area magnetic field reach requirement;
4) system begins temperature control according to set target temperature value; Reach and carry out temperature according to the set retention time behind the target temperature and keep, to guarantee that sample is by complete homogeneous heating;
5) signal measurement acquisition system and machine driven system collaborative work, after signal acquiring system gathered the data of an angle of sample, the probe that machine driven system drives signal acquiring system rotated, and measures after the translation-angle again; Finishing after the measurement that rotates a circle, finishing the test to this temperature spot;
6) system carries out step 4), 5 according to the temperature interval of target temperature point of heating) repetition;
7) finish the measurement of all temperature spots to be measured after, Computer is calculated the magnetic parameter value and is shown preservation.
Wherein, in step 4) in, if the sample temperature that thermopair is checked through does not reach target temperature, then temperature controller provides electric current for electric heater, the electric heater heating, the wind-force transmission system is opened, air enters the sample cavity heated sample after being heated through electric heater, and sample is after reaching target temperature, temperature controller provides a small amount of electric current to make system remain on target temperature, and the secondary magnetic field that the method for this use heated air stream heated sample produces in the time of can eliminating the electric heater energising is on the impact of sample.
Wherein, the parameter of input comprises that temperature interval (continuous temperature), target temperature retention time, the sample area magnetic field of target temperature point of target temperature point (single temperature), the heating of selection, the heating of magnetic parameter to be measured is set, probe rotates the interval angle step 2).
Wherein, when measuring remanent magnetism, the probe of signal acquiring system carries out one-shot measurement around sample every certain angle, and after rotating a circle, Computer is calculated orientation angle and the magnetic field intensity of the high-intensity magnetic field intensity of sample, calculates residual induction by these two.
Continuous temperature measurement of residual magnetism of the present invention system has opened up the continuous temperature measurement technology of the archaeomagnetism field magnetization, will measure with heating technique to combine, and makes it just can be measured in the process of heating, does not need to cool down; And the warming room that can control temperature every, such as the intensification of 1 degree, 1 degree, every liter 1 degree is measured once, like this, the data volume of actual measurement is just abundant.The present invention can obtain the measurement result under the continuous temperature, has remedied in the traditional measurement process, can only obtain the deficiency of discrete temperature spot information.Simultaneously, it can record magnetic parameter under warm-up mode technology has overcome the deficiency that traditional instrument is heated and is separated with measuring system, is achieved so that measure the technology of the magnetic parameters such as SIRM under the alternating temperature state.Simultaneously, because the present invention adopts the method for heated air stream heated sample, can extremely effectively eliminate secondary magnetic field that electric heater produces in the heating process in energising to the interference of sample measurement, guarantee the instrument test precision.This Instrument Design theory innovation, manufacture craft is advanced, and accuracy of instrument, stability all are higher than design standards, provide solid technical device to support for the test of archeo magnetism paleointensity realizes high-acruracy survey.This system has important science using value, has widely promotion prospect.
Description of drawings
Fig. 1: continuous temperature magnetic parameter measuring system fundamental diagram;
Fig. 2: continuous temperature magnetic parameter measuring system structured flowchart;
Fig. 3: Double-gear driving turntable 43 dimensional drawings;
Fig. 4: quartzy heat insulation specimen holder dimensional drawing.
Description of reference numerals:
The 1-sample cavity;
The 2-computing machine;
3-signal measurement acquisition system;
31-magnetic probe control module; The 32-fluxgate magnetic core; The 33-data collecting card;
The 4-machine driven system;
The 41-stepper motor drives control card; The 42-stepper motor; 43 Double-gear driving turntables;
The 5-temperature control system;
The 51-thermopair; The 52-temperature controller; The 53-electric heater;
The 6-flow delivery systems;
The 61-blower fan; The 62-air channel;
7-insulating portion (the double thermal insulation specimen holder of the anti-guncotton of inner clip);
The 8-magnetic shielding device;
9-magnetic field control system;
The 91-programmable power supply; 92-is controlled field coil;
The 10-sample.
Embodiment
Below in conjunction with accompanying drawing the present invention is specifically described.
As shown in Figure 1, 2, continuous temperature magnetic parameter measuring system of the present invention comprises several major parts such as sample cavity 1, computing machine 2, signal measurement acquisition system 3, machine driven system 4, temperature control system 5, flow delivery systems 6, insulating portion 7, magnetic shielding device 8 and magnetic field control system 9.
Wherein, sample cavity 1 is that sample 10 is in the placement fixed position of system; Computing machine 2 is responsible for each system of control system and is carried out collaborative work, finishes sample is carried out the magnetic parameter measurement at continuous temperature; Machine driven system 4 is responsible on demand with the different angle of sample 10 rotary movings, high-precision signal measurement acquisition system 3 is responsible for finishing the measurement of magnetic induction density, and signal measurement acquisition system 3 and machine driven system 4 two parts collaborative works can be finished the measurement collection of multiple magnetic parameter; Temperature control system 5 cooperates with each other with flow delivery systems 6 and uses heated air stream to realize the accurate temperature of sample 10 is controlled; Insulating portion 7 is double-deck quartzy framves of the anti-guncotton of inner clip, guarantees the not towards periphery environment diffusion of temperature of heated air stream; Magnetic shielding device 8 provides a lower magnetostatic environment for system, to guarantee the high precision magnetic-field measurement of system; Magnetic field control system 9 can load predetermined magnetic field in heating and cooling process, to satisfy the needs of paleointensity experiment.
The below specifically describes each ingredient.
One, sample cavity
Sample cavity 1 is the space of the fixed sample 10 opened up at double thermal insulation specimen holder 7, its gas channel that forms in the internal layer quartz wall is taken and has been put a potsherd that contains penetrating aperture, so that sample 10 can be placed in the sample cavity 1, and designed quartz specimen hatch door to be opened/closed in outer quartz wall, can after sample is placed, close sample cavity, guarantee the effect of heat insulation of system.
Two, computing machine
Be multi-purpose computer, but it have a plurality of COM port to realize each function of system.Wherein the user function software uses the LabVIEW language compilation, and after the setting of user's completion system parameters on the interface, computing machine 2 is controlled respectively flow delivery systems 6, temperature control system 5 is finished the temperature control to sample; Controlling magnetic field control system 9 is finished the magnetic field extra show requirement to sample; Control machine driven system 4 and Magnetic Measurement acquisition system 3 are finished the collection to the sample magnetic parameter.
Three, signal measurement acquisition system
Signal measurement acquisition system 3 comprises magnetic probe control module 31, fluxgate magnetic core 32, data collecting card 33.Wherein magnetic probe control module 31 both had been responsible for fluxgate magnetic core 32 power supply and signal excitation was provided, the electric signal that can convert to for the faint magnetic signal that data collecting card 33 provides probe to detect again.Therefore, the process that signal measurement gathers is as follows: magnetic probe control module 31 is received the test instruction that computing machine 2 sends, for fluxgate magnetic core 32 provides the power supply excitation, be placed in and record corresponding magnetic field after near sample 10 probes 32 are received excitation, after this field signal is processed into the electric signal that can be read at magnetic probe control module 31, gathered by data collecting card 33, transmit back computing machine 2.
The Mag-03 triaxial magnetometer that fluxgate magnetic core 32 can select Britain Ba Tingdun company to produce.The magnetometer of this compact has the high-performance fluxgate magnetic core of integrated electronic device, can carry out high-acruracy survey to stationary magnetic field and alternating magnetic field.Its measurement range comprises ± 70, ± 100, ± 250, ± 500 or ± 1000 μ T, in several ways encapsulation.This series probe can drive with the voltage of any ± 12V, with three-phase simulation voltage system 0-± the 10V scope, proportional corresponding Bx, By and Bz export.Probe can be with three different noise level supplies.The noise level of low noise version when 1 Hz less than 6pT rms/√ Hz, can be supplying except all packaged types of MCT type encapsulation, range is ± 70, ± 100 μ T.
The USB-6251 data collecting plate card that data collecting card 33 can adopt America NI company to produce, it has 16 tunnel analog inputs (16), single channel sampling rate 1.25 M/s wherein, and can use NI-DAQmx drive software and NI LabVIEW SignalExpress interactive data logging software.NI USB-6251 is a USB high speed M series multifunctional DAQ module, also can keep high precision under high sampling rate.The installation of its plug and play has farthest reduced configuration and setup times, and simultaneously it can directly link to each other with screw terminal, thereby has cut down cost and simplified the connection of signal.NI-DAQmx driver and measurement service software provide configuration and the programming interface that is simple and easy to usefulness, and the functions such as DAQ Assistant can shorten the development time.Therefore, its just the needed dynamic signal acquisition of native system use and cooperate the ideal chose of sensor measurement.
Four, machine driven system
Machine driven system comprises that stepper motor drives control card 41, stepper motor 42, and Double-gear driving turntable 43 etc., but be the operating platform of an automatic rotating sample test of measurement system building angle.
Wherein, computing machine 2 sends instruction and drives control card 41 to stepper motor, drive control card 41 according to the step number of command calculations stepper motor needs running, and control step motor 42 motions, pinion wheel in the rotation axis of stepper motor 42 the is nested Double-gear driving turntable 43, the pinion wheel motion drives gear wheel and rotates, the variation of instrument probe counter sample angle is finished in the rotation of fluxgate magnetic core 32 on gear drive and then the drive measuring table, software simultaneously 3 pairs of samples of control signal measurement acquisition system is measured, thereby finishes the sample measurement of robotization full angle.
On the control problem of resolution system to stepper motor and measurement of residual magnetism instrument, native system will adopt LabVIEW software programming realization to the control of system, and in the establishment interface, the user can arrange the specimen number, each sample test number of times, sample measurement angle intervals etc.When working procedure, be the ASCII character that measurement of residual magnetism instrument and stepper motor can be identified by serial ports with the G language conversion of program, to realize the control to the two.Wherein, big or small gear ratio is 198:38, and diameter is than being 400:80.Fig. 3 is Double-gear driving turntable 43 dimensional drawings.
Five, temperature control system
Thermopair 51 is selected R type thermopair, has the precision height, and temperature is floated little advantage.
The 2604 type temperature controllers that temperature controller 52 selects Eurotherm company to produce.But this temperature controller is a kind of modular free configuration, high precision, high performance temperature and process controller.It has single loop, two-circuit or three circuit patterns.The control loops such as tandem, ratio can also be arranged in each loop except can be used as common pid loop.It is furnished with 7 buttons, is used for switching various state of a controls and revises parameter.Because it has the pattern of three heating circuits of maximum controls, so that system can have the potential function of the Multi-example heating of the multistage heating of large sample or Future Development.In actual use, its accuracy of temperature control is suitable height also, can reach 0.1 ℃, and therefore, in temperature control, this system can finish the temperature performance index of room temperature to 800 ℃, can meet design requirement fully.
Electric heater 53 can be selected the nickel chromium triangle electric furnace heating wire.This stove silk has good inoxidizability, and anti-carburizing energy relatively preferably has good corrosion resistance when polluted by sulfur-bearing atmosphere to sulfur-bearing atmosphere and surface.Be widely used in the industries such as industrial furnace, metallurgy, machinery, electrical equipment, aircraft, automobile making, military project and make heater element and resistive element.
Six, air-flow transmission system
The air-flow transmission system 6 of system is made of blower fan 61 and air channel 62.Disturb in order to prevent that magnetic field that blower fan when motion produce from producing sample measurement, with the bottom of blower fan 51 designs in system, maintain a certain distance (preferred 1 meter) with the sample measurement district, add like this effect of shielding harness, fan blower 51 will be got rid of fully on the impact of sample measurement.In order to guarantee the realization of heating power, can select 330W, rotating speed is at the centrifugal blower of 3000r/min.What transmission pipeline 52 selected that aluminium foil makes can crooked pipeline, pipe end access electric heater 53, make air heat after, pass into sample cavity 1, like this, just realized the heating transmission of air-flow.
Seven, insulating portion
In order to guarantee the needs of high temperature test, simultaneously in view of the superelevation requirement of native system to magnetic parameter, designed the whole double thermal insulation specimen holder 7 of being fired by nonmagnetic transparent quartz material, fill therein the not towards periphery environment diffusion of air themperature that the heat-barrier material such as ceramic fiber transports to guarantee air-flow transmission system 6, simultaneously, specimen holder 7 integral body are all made by non-magnetic material, have guaranteed not introduce in the measuring process other interference.Quartzy heat insulation specimen holder dimensional drawing is seen Fig. 4.
Eight, magnetic shielding device
In order to make native system in the Magnetic Measurement process, exclude surrounding magnetic field to the interference of its generation, must use the test zone of 8 pairs of systems of magnetic shielding device to carry out magnetic shielding.At present the most frequently used magnetic shielding material has two kinds of ultracrystallite and permalloys, wherein the ultracrystallite material is easy to processing, the advantage such as cheap, but because its magnetic permeability is high less than permalloy, therefore need in the magnetic shielding below 100nT can realize than enclosing the more number of plies of system more than the 100nT; Although the permalloy magnetic permeability is high, and is expensive, processing difficulties.This bi-material all can be separately as the magnetic shielding material of this patent, but consider the factor of the aspects such as price and processing, preferred version of the present invention is: at first use the ultracrystallite material system of enclosing outer, the shielding for the treatment of magnetic field reaches after the 100nT rank, innermost layer re-uses the internal layer shielding bucket of being made by permalloy, because its magnetic permeability is higher, can effectively environmental magnetic field be dropped to comparatively ideal 20nT with interior scope.
Nine, magnetic field control system
Because the mensuration of some magnetic parameters need to be specified the magnetic field that requires to offering sample, so native system has designed the magnetic field control system.The magnetic field control system 9 of system comprises programmable power supply 91 and control field coil 92.Send instruction in the computing machine 2 to programmable power supply 91, power supply magnetic field value as requested offers the control field coil 92 of sample area with corresponding electric current, and coil electricity produces magnetic field, finishes the magnetic field control to sample.
Ten, sample
Native system institute specimen 10 is the standard model in archeo magnetism field.Concrete specification is: high 2cm, the cylindrical rock sample of diameter 2.54cm; Or the cube Loess Samples of 2cm.
The process that adopts measuring system of the present invention to measure is described below in conjunction with accompanying drawing 1-4.
1 at first puts into sample cavity 1 with sample 10, and closes hatch door, places magnetic shielding device 7.In the required series of parameters of computing machine 2 input institute's test sample product, computing machine begins to control each several part and carries out work according to the parameter of inputting afterwards.
The parameter of 2 inputs comprises measures which kind of magnetic parameter (such as remanent magnetism, SIRM (SIRM)); The target temperature point (single temperature spot measurement) of heating; The temperature interval (continuous temperature point measurement) of the target temperature point of heating; The target temperature retention time; The setting in magnetic field; Probe rotation interval angle etc.
The A wherein selection of magnetic parameter can have two classes: the first kind is vector parameters, be exactly both to have needed to survey the intensity size, what need again to survey the strongest direction in angle, this class parameter is take remanent magnetism as representative, remanent magnetism comprises three parameters, intensity, magnetic declination and magnetic dip, these three parameters are to be calculated by size and Orientation.Because this class parameter needs direction of measurement, so just need driven by motor driven by rotary disc probe to center on the wheel measuring that sample carries out at least one week, namely mechanical rotation system is measured with measurement acquisition system cooperative cooperating.Equations of The Second Kind is scalar parameter, only need to measure the value of sample on fixed-direction, this class parameter is take SIRM (SIRM) as representative, it need to be measured sample and load the afterwards sample value of the loading magnetic direction of different temperature points of saturation magnetic field (being generally greater than 1T), so just do not need the work of machine driven system.And the traditional measurement method of this class parameter is as follows: separate with heating system owing to measure, sample need to be added first saturation field, heat again, measure again after the cooling, therefore measured value is value at ambient temperature, but can be subjected to the impact of temperature on this parameter theory, therefore, the value of measuring in different temperatures is different.Classic method cannot be measured in heating, and the present invention can be in the characteristics of measuring under the condition of heating so that measure the technology of the magnetic parameters such as SIRM under the alternating temperature state and be achieved.
If B only need to measure the data of some temperature spots, the user need to arrange the target temperature point (single temperature spot measurement) of heating;
The temperature interval (continuous temperature point measurement) of the target temperature point of heating if needing to measure the data (measuring a point such as per 50 degree of 20-700) on the continuous temperature section, C need be set.
The D target temperature retention time, different samples needs the different target temperature retention times enough to heat at design temperature to guarantee sample.
The setting in E magnetic field guarantees that sample is in the magnetic field that sets.
F probe rotation interval angle, when measuring vector, probe needs at least around one week of sample measuring the strongest direction that just can calculate sample, therefore, probe rotation interval angle is less, and it is more to measure number of times, the result who calculates is also more accurate, but the corresponding test duration also can increase.
3 computing machines are coil power supply according to the setup control programmable power supply 91 in magnetic field, make sample area magnetic field reach requirement.
4 systems begin temperature control according to set target temperature value, the sample temperature that detects such as thermopair does not reach target temperature, then temperature controller provides electric current for electric heater, the electric heater heating, the wind-force transmission system is opened, after air is heated through electric heater, enter the sample cavity heated sample, sample is after reaching target temperature, and the target temperature retention time that system arranges according to the user, the control temperature controller provides a small amount of electric current to make system remain on target temperature to electric heater.Retention time enters the test link after finishing.
If what 5 users measured is the such vector parameters of remanent magnetism, signal measurement acquisition system and machine driven system collaborative work, probe carries out one-shot measurement around sample every certain angle, after rotating a circle, how many orientation angles that computing machine can calculate the high-intensity magnetic field intensity of sample is, how many magnetic field intensitys is, these two can calculate residual induction and (comprise magnetic dip, magnetic declination, field strength values); If what measure is the such scalar of SIRM, then system only need control signal acquisition device of mechanical rotation system and probe is moved to aim at adds field direction and measure collection and get final product.
If 6 users test is the data of single temperature spot, behind 4,5 liang of EOSs, computer accounting is calculated the magnetic parameter value and is shown preservation so; If user test is test on the continuous temperature section, system can carry out the repetition in 4,5 liang of steps according to the temperature interval of the target temperature point of heating so, until finish the measurement of all temperature spots to be measured.
Claims (10)
1. continuous temperature magnetic parameter measuring system, it is characterized in that, comprise: sample cavity (1), computing machine (2), signal measurement acquisition system (3), machine driven system (4), temperature control system (5), flow delivery systems (6), insulating portion (7), magnetic shielding device (8) and magnetic field control system (9), the wherein collaborative measurement collection of finishing multiple magnetic parameter of signal measurement acquisition system (3) and machine driven system (4) two parts; Temperature control system (5) cooperates with each other with flow delivery systems (6) and uses heated air stream that sample (10) is carried out temperature control; Magnetic shielding device (8) is used for providing a magnetostatic environment, magnetic field control system (9) loads predetermined magnetic field to sample area, the collaborative work of computing machine (2) control system various piece, can under the alternating temperature state, measure, thereby obtain the multiple magnetic parameter information such as continuous temperature Duan Shangru natural remanent magnetization, SIRM.
2. continuous temperature magnetic parameter measuring system according to claim 1, it is characterized in that, described signal measurement acquisition system (3) comprises magnetic probe control module (31), fluxgate magnetic core (32) and data collecting card (33), wherein magnetic probe control module (31) provides power supply and signal excitation for fluxgate magnetic core (32), and the electric signal that the faint magnetic signal that simultaneously probe is detected converts to offers data collecting card (33).
3. continuous temperature magnetic parameter measuring system according to claim 2, it is characterized in that, machine driven system (4) comprises that stepper motor drives control card (41), stepper motor (42), with Double-gear driving turntable (43), but the operating platform for an automatic rotating sample test of measurement system building angle, the pinion wheel in the nested Double-gear driving turntable of the rotation axis of stepper motor (42) (43) wherein, the pinion wheel motion drives gear wheel and rotates, and gear drive and then the fluxgate magnetic core (32) that drives on the measuring table rotate.
4. according to claim 2 or 3 described continuous temperature magnetic parameter measuring systems, it is characterized in that, temperature control system (5) comprises thermopair (51), temperature controller (52) and electric heater (53), wherein, be placed on the temperature that near thermopair (51) the monitoring sample of sample (10) reaches, computing machine (2) sends temperature control instruction to temperature controller (52), temperature controller (52) is that in real time distribution of electric heater (53) will reach the needed heating current of target temperature according to the temperature data of thermopair (51) feedback, heating after electric heater (53) energising, the air heat that flow delivery systems (6) is flow through, be delivered to sample cavity (1) heated sample (10), the secondary magnetic field that the method for this use heated air stream heated sample produces in the time of can eliminating electric heater (53) energising is on the impact of sample; Air-flow transmission system (6) comprises blower fan (61) and air channel (62), and blower fan (61) is arranged on the bottom of measuring system, with the distance of sample measurement district maintenance more than one meter.
5. each described continuous temperature magnetic parameter measuring system according to claim 1-4, it is characterized in that, magnetic field control system (9) comprises programmable power supply (91) and control field coil (92), programmable power supply (91) magnetic field value as requested offers corresponding electric current the control field coil (92) of sample area, control field coil (92) energising produces magnetic field, finishes the magnetic field control to sample.
6. each described continuous temperature magnetic parameter measuring system is characterized in that according to claim 1-5, and the whole double thermal insulation specimen holder that described insulating portion (7) is fired for nonmagnetic transparent quartz material is filled the fire prevention temperature-resistant material in the double-deck quartz wall; Described magnetic shielding device (8) comprises the skin that the ultracrystallite material is made, and the internal layer made of permalloy or only made by a kind of material wherein.
7. the method that adopts each described continuous temperature magnetic parameter measuring system of 1-6 to measure is characterized in that, comprises the steps
1) sample (10) is put into sample cavity (1), and close hatch door, place magnetic shielding device (8);
2) in the required series of parameters of computing machine (2) input institute's test sample product;
3) computer control magnetic field control system (9) makes sample area magnetic field reach requirement;
4) system begins temperature control according to set target temperature value; Reach and carry out temperature according to the set retention time behind the target temperature and keep, to guarantee that sample is by complete homogeneous heating;
5) signal measurement acquisition system (3) and machine driven system (4) collaborative work, after signal acquiring system gathered the data of an angle of sample, the probe that machine driven system drives signal acquiring system rotated, and measures after the translation-angle again; Finishing after the measurement that rotates a circle, finishing the test to this temperature spot;
6) system carries out step 4), 5 according to the temperature interval of target temperature point of heating) repetition;
7) finish the measurement of all temperature spots to be measured after, Computer is calculated the magnetic parameter value and is shown preservation.
8. method according to claim 7, it is characterized in that, in step 4) in, if the sample temperature that thermopair is checked through does not reach target temperature, then temperature controller provides electric current for electric heater, the electric heater heating, air-flow transmission system (6) is opened, and air enters the sample cavity heated sample after being heated through electric heater, sample is after reaching target temperature, and temperature controller provides a small amount of electric current to make system remain on target temperature.
9. according to claim 7 or 8 described methods, it is characterized in that step 2) in the parameter of input comprise that temperature interval (continuous temperature), target temperature retention time, the sample area magnetic field of target temperature point of target temperature point (single temperature), the heating of selection, the heating of magnetic parameter to be measured is set, probe rotates the interval angle.
10. each described method according to claim 7-9, when measuring remanent magnetism, the fluxgate magnetic core (32) of signal measurement acquisition system (3) carries out one-shot measurement around sample every certain angle, after rotating a circle, Computer is calculated orientation angle and the magnetic field intensity of the high-intensity magnetic field intensity of sample, calculates residual induction by these two.
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