CN102901662A - Sample polarization system based on permanent magnet and automatic transmission device - Google Patents
Sample polarization system based on permanent magnet and automatic transmission device Download PDFInfo
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- CN102901662A CN102901662A CN2012104089585A CN201210408958A CN102901662A CN 102901662 A CN102901662 A CN 102901662A CN 2012104089585 A CN2012104089585 A CN 2012104089585A CN 201210408958 A CN201210408958 A CN 201210408958A CN 102901662 A CN102901662 A CN 102901662A
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- automatic conveying
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Abstract
The invention relates to a sample polarization system based on a permanent magnet and an automatic transmission device. The sample polarization system is characterized by comprising the permanent magnet, the automatic transmission device, a connecting rod, a guide rail and a sample placing trolley, wherein one end of the guide rail is positioned at the center of the permanent magnet, the other end of the guide rail is positioned at a testing point for physicochemical property testing for a polarized sample, the connecting rod is connected with the trolley and the automatic transmission device, and the automatic transmission device can drive the connecting rod and the trolley to automatically perform parallel reciprocating motion in the guide rail. The sample is polarized at the center of the permanent magnet and the physicochemical property testing for the sample is carried out at the testing point. By arranging the automatic transmission device, the polarization time, transmission time, transmission speed and accelerated speed can be changed within the distance between the center of the permanent magnet and the testing point. The sample polarization system has very good application prospect in applications of extremely low field nuclear magnetic resonance based on SQUID (Superconducting Quantum Interference Device) and imaging thereof and the like.
Description
Technical field
The present invention relates to a kind of sample polarization system and method based on permanent magnet and automatic conveying device, belong to technology and the automatic transmission technology of polarized sample.
Background technology
During the scientific experiment research and analysis, people often can need sample is tested its physical and chemical performance behind strong magnetic field action.Such as, in low-field nuclear magnetic resonance and the imaging experiment, in order to improve the signal to noise ratio (S/N ratio) of NMR signal, usually come pre-polarized sample with a high-intensity magnetic field than the high several magnitudes of measurement field.Sample polarizes under high-intensity magnetic field first, turn-offs this high-intensity magnetic field again, begins afterwards to measure NMR signal.In existing low-field nuclear magnetic resonance and the imaging technique, usually produce high-intensity magnetic field [Robert McDermott with energization solenoid, Andreas H.Trabesinger, Michael M ü ck, Erwin L.Hahn, Alexander Pines, John Clarke, Liquid-State NMR and Scalar Couplings in Microtesla Magnetic Fields, Science, 2002 (295): 2247-2248; John Clarke, Michael Hartidge and Michael
SQUID-Detected Magnetic Resonance Imaging in Microtesla Fields, Annu.Rev.Biomed.Eng., 2007 (9): 389-413.], do like this and have problems: the one, because sample polarizes in advance in position and measures, radio noise meeting severe jamming Magnetic Sensor (such as SQUID) is so that the test of some physical and chemical performances (such as nuclear magnetic resonance) can't be carried out; The 2nd, pass to for a long time large electric current and can cause coil heating, so that can't carry out the sensitive experiment of temperature, the 3rd, the existence of inductance is so that coil is difficult to quick shutoff.The permanent magnet polarized sample has been suggested as a kind of effective, succinct polarization method.
Scientific experiment usually need to be under identical parameter repeatedly repeats, one can the confirmatory experiment result reliability, two can improve signal to noise ratio (S/N ratio).In the sample polarization system based on permanent magnet, if adopt the manually mode of transmission sample, in repeated experiments, can't guarantee the accurate consistent of polarization time and transmission time.Therefore native system combines automatic conveying device, is used for sample is transported to test position.
Summary of the invention
The object of the present invention is to provide a kind of sample polarization system based on permanent magnet and automatic conveying device and and use this system to carry out the method for polarized sample so that sample can be in advance under strong magnetic field action polarization more rapidly automatic transmission carry out physical and chemical performance to the detection position and measure.
The technical solution adopted for the present invention to solve the technical problems is: a kind of sample polarization system based on permanent magnet and automatic conveying device is provided, comprises permanent magnet, automatic conveying device, connecting link, guide rail and hold the dolly of sample.Wherein, described guide rail one end is positioned at described permanent magnet center, and the other end is positioned at the measuring point that carries out the physical and chemical performance test after the sample polarization; Described connecting link connects dolly and automatic conveying device; Described automatic conveying device can drive connecting link and automatically do parallel to-and-fro movement with dolly in guide rail.When polarized sample, dolly is positioned at the permanent magnet center; After finishing polarization process, be transferred to the detection position.With the motion of guide rail restriction dolly, can be better
Described permanent magnet is placed up and down by two block permanent magnets and is consisted of, and the interval is about 3-5cm.Whole permanent magnet system shields with soft iron, only stays osculum to be used for guide rail and sample transportation.The magnetic field at permanent magnet center is about 0.65 tesla.
Described automatic conveying device can be electric actuator or pneumatic actuator, and the present invention uses is the electric actuator of the LEFB25AT-1500B-R36P3D type produced of Japanese SMC company, and its range is 1.5m, maximal rate 2m/s, peak acceleration 3m/s
2
The distance of permanent magnet center and measuring point can be fixed, and also can change as required, is about 0.5 – 1.8m, can change in a stepwise manner this distance.
Described rail length determines according to the distance of permanent magnet and measuring point, is about 1.8m.
Described connecting link length is determined according to the distance between described permanent magnet and the automatic conveying device, is about 1.8-2.3m.
The technical solution adopted for the present invention to solve the technical problems may further comprise the steps:
(1) according to the needs of experiments of measuring, determines the position of measuring point and the position of permanent magnet.
(2) place guide rail and the dolly that holds sample by Fig. 1, connect dolly and automatic conveying device with connecting link
(3) automatic conveying device is set, makes dolly first in permanent magnet central stationary a period of time, more static a period of time along guide rail movement to measuring point, return again the permanent magnet center, consist of a circulation;
(4) start automatic conveying device, dolly is according to the to-and-fro movement that arranges in (3) step.
(5) comprehensive top step, sample namely can be arrived measuring point by automatic transmission after the polarization of permanent magnet center, carry out the measurement of physical and chemical performance.
Owing to adopted above-mentioned technical scheme, the present invention compared with prior art has following advantage and good effect:
1. the magnetic field that produces of the permanent magnet that uses of system can be greater than energization solenoid, be applied to low-field nuclear magnetic resonance and imaging after, can greatly improve the intensity of NMR signal, and then improve signal to noise ratio (S/N ratio);
2. high-intensity magnetic field is away from measuring point, and permanent magnet to the Magnetic Sensor of measuring point without electromagnetic interference (EMI), can solve energization solenoid and Magnetic Sensor be produced the problem of disturbing.
3. polar system provided by the present invention can guarantee the accurate consistent of polarization time and transmission time, so that repeated experiments can access consistent result.After being applied to low-field nuclear magnetic resonance and imaging, can test to improve the spectrogram signal to noise ratio (S/N ratio) by multiple averaging.
Therefore of the present invention have good application prospect in based on researchs such as the utmost point low-field nuclear magnetic resonance of SQUID and imagings thereof.The inventor has been applied to native system the low-field nuclear magnetic resonance of water sample and has measured, and has changed the distance of magnetic blow out centre and measurement point, and the result of acquisition as shown in Figure 2.
Description of drawings
Fig. 1 is sample polarization system schematic provided by the invention;
The result of Fig. 2 for using polar system shown in Figure 1 to measure.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.Should be understood that in addition after having read content of the present invention, those skilled in the art can make various changes or modifications the present invention, these equivalent form of values fall within the application's appended claims limited range equally.
The present invention relates to the sample polarization system of a kind of permanent magnet and automatic conveying device as shown in Figure 1, comprise permanent magnet, automatic conveying device, connecting link, guide rail and hold the dolly of sample.Permanent magnet is used for polarized sample, and automatic conveying device can drive connecting link and do parallel to-and-fro movement with the dolly that holds sample in guide rail.By automatic conveying device is set, under can be in the distance between permanent magnet center and the measuring point certain situation, change polarization time, transmission time, transmission speed and acceleration; Perhaps can change to stepping the distance between permanent magnet center and the measuring point.System of the present invention is easy to build, cost is low, simple to operate.System uses permanent magnet, not only can strengthen magnetic field, and make high-intensity magnetic field away from measuring point.Automatic conveying device can guarantee the accuracy in polarization time and transmission time, so that repeated experiments can access consistent result; Simultaneity factor to the Magnetic Sensor of measuring point substantially without any electromagnetic interference (EMI).The distance of the center of permanent magnet and measuring point can be fixed in the present embodiment, also can change as required, is 0.5 – 1.8m.
Test macro provided by the invention carries out method concrete steps such as the identical description of summary of the invention of polarized sample.Fig. 2 is that the spacing of permanent magnet center and measuring point is respectively 0.5,0.75 and low-field nuclear magnetic resonance time-domain signal during 1.5m.Because permanent magnet can change the homogeneity of environmental magnetic field close to too from measuring point, so difference is arranged when the time-domain signal that obtains when being 0.5m and 0.75m of spacing and 1.5m.
Claims (9)
1. sample polarization system based on permanent magnet and automatic conveying device, the dolly that it is characterized in that comprising permanent magnet, automatic conveying device, connecting link, guide rail and hold sample, described guide rail one end is positioned at described permanent magnet center, and the other end is positioned at the measuring point that carries out the physical and chemical performance test after the sample polarization; Described connecting link connects dolly and automatic conveying device; Described automatic conveying device can drive connecting link and automatically do parallel to-and-fro movement with dolly in guide rail.
2. polar system according to claim 1 is characterized in that sample in the polarization of permanent magnet center, carries out the physical and chemical performance test at measuring point.
3. polar system according to claim 1 is characterized in that described permanent magnet is made of two upper and lower placements of magnet, is spaced apart 3-5cm, and whole permanent magnet system shields with soft iron.
4. according to claim 1 or 3 described polar systems, the central magnetic field that it is characterized in that permanent magnet is 0.65 tesla.
5. polar system according to claim 1 is characterized in that:
1. distance is 0.5-1.8m between permanent magnet center and the side point; This distance changes in a stepwise manner;
2. connecting link length determines that according to the distance between described permanent magnet and the automatic conveying device this distance is 1.8-2.3m.
6. polar system according to claim 1 is characterized in that by automatic conveying device is set, can change polarization time, transmission time, transmission speed and acceleration in the distance between permanent magnet center and measuring point.
7. polar system according to claim 1 is characterized in that described automatic conveying device, is electric actuator or pneumatic actuator.
8. use the method for polar system as claimed in claim 1, it is characterized in that may further comprise the steps:
(1) according to the needs of experiments of measuring, determines the position of measuring point and the position of permanent magnet.
(2) place guide rail and the dolly that holds sample, connect dolly and automatic conveying device with connecting link
(3) automatic conveying device is set, makes dolly first in permanent magnet central stationary a period of time, more static a period of time along guide rail movement to measuring point, return again the permanent magnet center, consist of a circulation;
(4) start automatic conveying device, dolly is according to the to-and-fro movement that arranges in (3) step.
(5) through above steps, sample namely can be arrived measuring point by automatic transmission after the polarization of permanent magnet center, carry out the measurement of physical and chemical performance.
9. the application of each described polar system according to claim 1-3 is characterized in that being applied in utmost point low-field nuclear magnetic resonance and imaging aspect.
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| CN2012104089585A CN102901662A (en) | 2012-10-23 | 2012-10-23 | Sample polarization system based on permanent magnet and automatic transmission device |
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| CN2012104089585A CN102901662A (en) | 2012-10-23 | 2012-10-23 | Sample polarization system based on permanent magnet and automatic transmission device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5055787A (en) * | 1986-08-27 | 1991-10-08 | Schlumberger Technology Corporation | Borehole measurement of NMR characteristics of earth formations |
| JPH06201808A (en) * | 1992-12-26 | 1994-07-22 | Daido Steel Co Ltd | Detecting apparatus for magnetic force of raw material of magnet |
| JP2004125539A (en) * | 2002-10-01 | 2004-04-22 | Nippon Denshi Eng Kk | Sample transfer mechanism |
| US20060020403A1 (en) * | 2004-07-08 | 2006-01-26 | Pusiol Daniel J | Device and method for real time direct measurement of the proportion and flow-rate of a multi-component complex fluid |
| CN1942786A (en) * | 2004-04-30 | 2007-04-04 | 波克股份有限公司 | RF probe apparatus for nmr check weighing system |
| CN102156269A (en) * | 2011-03-07 | 2011-08-17 | 中国科学院地质与地球物理研究所 | Automation magnetic susceptibility instrument capable of measuring long core, measurement method and placing support thereof |
-
2012
- 2012-10-23 CN CN2012104089585A patent/CN102901662A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5055787A (en) * | 1986-08-27 | 1991-10-08 | Schlumberger Technology Corporation | Borehole measurement of NMR characteristics of earth formations |
| JPH06201808A (en) * | 1992-12-26 | 1994-07-22 | Daido Steel Co Ltd | Detecting apparatus for magnetic force of raw material of magnet |
| JP2004125539A (en) * | 2002-10-01 | 2004-04-22 | Nippon Denshi Eng Kk | Sample transfer mechanism |
| CN1942786A (en) * | 2004-04-30 | 2007-04-04 | 波克股份有限公司 | RF probe apparatus for nmr check weighing system |
| US20060020403A1 (en) * | 2004-07-08 | 2006-01-26 | Pusiol Daniel J | Device and method for real time direct measurement of the proportion and flow-rate of a multi-component complex fluid |
| CN102156269A (en) * | 2011-03-07 | 2011-08-17 | 中国科学院地质与地球物理研究所 | Automation magnetic susceptibility instrument capable of measuring long core, measurement method and placing support thereof |
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Application publication date: 20130130 |