CN105092974A - Measurement method for resistivity of permanent magnet materials with change of temperatures and intensities of pressure - Google Patents
Measurement method for resistivity of permanent magnet materials with change of temperatures and intensities of pressure Download PDFInfo
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- CN105092974A CN105092974A CN201510566608.5A CN201510566608A CN105092974A CN 105092974 A CN105092974 A CN 105092974A CN 201510566608 A CN201510566608 A CN 201510566608A CN 105092974 A CN105092974 A CN 105092974A
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Abstract
The present invention provides a measurement method for resistivity of permanent magnet materials with the change of temperatures and intensities of pressure. The present invention relates to a measurement method for the resistivity of permanent magnet materials with the change of temperatures and intensities of pressure, comprising: (1) measuring a resistance value of a cylindrical permanent magnet sample at a normal pressure and a temperature, recording the resistance value, then fixing the cylindrical permanent magnet sample at insulating materials and putting the cylindrical permanent magnet sample into a high pressure sealing barrel, and tightly winding heating cables at the outside surface of the high pressure sealing barrel or directly putting a pressure-proof high-power electric heater into the high pressure sealing barrel; (2) connecting the heating cables or the high-power electric heater with an alternating current power supply, regulating an output voltage of the alternating current power supply, observing temperature values in the high pressure sealing barrel displayed on a temperature sensor through a probe of the temperature sensor putted into the high pressure sealing barrel at any time, then holding the temperature value for a while after reaching the required temperature value, and the measurement starts. According to the invention, the measurement method for the resistivity of permanent magnet materials with the change of the temperatures and the intensities of pressure are provided.
Description
Technical field:
The present invention relates to the measuring method of a kind of permanent magnetic material resistivity with temperature and pressure change.
Background technology:
Along with expanding economy and the mankind are for the continuous increase of petroleum-based energy demand, exploitation for petroleum resources develops to deep-seated oil gas field just gradually, along with the continuous intensification of drilling depth, inevitably run into the environment that High Temperature High Pressure etc. is exceedingly odious, magneto as execution and functional part also will be subject to the test of extreme environment, this is wherein primary is exactly the performance change situation of material therefor, the resistivity wherein just comprising permanent magnetic material is to the situation of change of temperature and pressure, therefore for the permanent magnetic material resistivity be operated in Oil/gas Well, the situation of change of temperature and pressure is just seemed particularly important, the invention provides a kind of being used for for this reason and measure the method for permanent magnetic material resistivity with pressure change, this is also for designer provides necessary performance parameter.
Summary of the invention:
The object of this invention is to provide and a kind ofly can measure the situation of change of permanent magnet sample resistivity with temperature and pressure very easily, and the method has very high precision, the temperature that the present invention proposes and the common implementation method of pressure can be applied in the detection of different materials, and the permanent magnetic material resistivity had broad application prospects is with the measuring method of temperature and pressure change.
Above-mentioned object is realized by following technical scheme:
Permanent magnetic material resistivity, with a measuring method for temperature and pressure change, measures permanent magnetic material resistivity as follows with the step of temperature and pressure change:
1. the resistance value of cylindrical permanent magnet sample under normal temperature and pressure is first measured and record, again cylindrical permanent magnet sample is fixed on the insulating material, put into high pressure sealing bucket, afterwards, be wound around heating cable in the intimate of high pressure sealing bucket or in high pressure sealing bucket, directly put into withstand voltage large power, electrically well heater.
2. heating cable or large power, electrically well heater are connected AC power, regulate the output voltage of AC power, temperature sensor probe in loading high pressure sealing bucket is utilized to observe the temperature value in the high pressure sealing bucket of temperature sensor display at any time, after reaching temperature required value, this temperature value is kept at least 30 minutes, and record temperature value T now, then start to measure.
3. after the temperature of cylindrical permanent magnet sample is up to standard, regulate the forcing pump be connected with high pressure sealing bucket, force value in slow increase high pressure sealing bucket, observe the force value that pressure transducer shows, the force value degree of accuracy that pressure transducer shows is greater than the value shown by tensimeter on forcing pump, and closer to the actual value in high pressure sealing bucket.
4. the pressure value P of record shown by pressure transducer, and measure the resistance value R of the cylindrical permanent magnet sample obtained, and the permanent magnet sample electricalresistivityρ calculating cylindrical permanent magnet sample different pressures at such a temperature:
In formula, S is the cross-sectional area of sample; L
effor the distance between voltage detecting end.
5. repeat step 1. ~ step 4., measure the resistance value R of the cylindrical permanent magnet samples corresponding to pressure different under different temperatures, and calculate corresponding permanent magnet sample electricalresistivityρ.
Described permanent magnetic material resistivity is with the measuring method of temperature and pressure change, first on cylindrical permanent magnet sample, choose four different positions, the extension line of resistance measuring instrument and this four positions are contacted, outermost two positions of cylindrical permanent magnet sample are galvanic contact end, two positions inside cylindrical permanent magnet sample are voltage detecting end, then the resistance R of sample just directly can be obtained by resistance measuring instrument, according to measuring the sample resistance R obtained, the electricalresistivityρ calculating sample is:
In formula, S is the cross-sectional area of sample; L
effor the distance between voltage detecting end.
Described permanent magnetic material resistivity is with the measuring method of temperature and pressure change, 3. in high pressure sealing bucket, the experiment oil of 95% is first injected according to step, then the cylindrical permanent magnet sample connected is put into high pressure sealing bucket, put into high pressure sealing bucket by being used for the high pressure resistant temperature sensor of monitor temperature and pressure transducer simultaneously simultaneously, make temperature sensor, pressure transducer and cylindrical permanent magnet sample are placed on same position height, after high pressure sealing bung is tight, the forcing pump that utilization is connected with high pressure sealing bucket raises the force value in high pressure sealing bucket, the size of force value reads by pressure transducer.
Described permanent magnetic material resistivity is with the measuring method of temperature and pressure change, according to step 1. with the outside surface 2. heating cable being closely wrapped in high pressure sealing bucket, and the end of heating cable is received in frequency and all adjustable AC power of amplitude, then insulating heat insulating material is superscribed at the outside surface of heating cable, utilize the temperature sensor in high pressure sealing bucket to monitor temperature in high pressure sealing bucket at any time, then regulate the output of AC power according to actual measurement.
Described permanent magnetic material resistivity is with the measuring method of temperature and pressure change, 1. with 2. direct, withstand voltage large power, electrically well heater is put into high pressure sealing bucket according to step, the lead-in wire of large power, electrically well heater is drawn by the sealing wire hole of high pressure sealing barrel top cover, and the lead-in wire of large power, electrically well heater is received in frequency and the adjustable AC power of amplitude, the temperature sensor in high pressure sealing bucket is utilized to monitor temperature in high pressure sealing bucket at any time equally, then regulate the output of AC power as required, now high pressure bucket outside still needs to superscribe insulating heat insulating material.
Beneficial effect:
1. the present invention's resistivity that can measure cylindrical permanent magnet sample is very easily with the situation of change of temperature and pressure.
2. the present invention measures the conforming degree of accuracy obtaining result at every turn and can reach more than 98%.
3. the temperature that proposes of the present invention and the method that jointly realizes of pressure can be applied in the detection of different materials, have broad application prospects.
Embodiment:
Embodiment 1
Permanent magnetic material resistivity, with a measuring method for temperature and pressure change, measures permanent magnetic material resistivity as follows with the step of temperature and pressure change:
1. the resistance value of cylindrical permanent magnet sample under normal temperature and pressure is first measured and record, again cylindrical permanent magnet sample is fixed on the insulating material, put into high pressure sealing bucket, afterwards, be wound around heating cable in the intimate of high pressure sealing bucket or in high pressure sealing bucket, directly put into withstand voltage large power, electrically well heater.
2. heating cable or large power, electrically well heater are connected AC power, regulate the output voltage of AC power, temperature sensor probe in loading high pressure sealing bucket is utilized to observe the temperature value in the high pressure sealing bucket of temperature sensor display at any time, after reaching temperature required value, this temperature value is kept at least 30 minutes, and record temperature value T now, then start to measure.
3. after the temperature of cylindrical permanent magnet sample is up to standard, regulate the forcing pump be connected with high pressure sealing bucket, force value in slow increase high pressure sealing bucket, observe the force value that pressure transducer shows, the force value degree of accuracy that pressure transducer shows is greater than the value shown by tensimeter on forcing pump, and closer to the actual value in high pressure sealing bucket.
4. the pressure value P of record shown by pressure transducer, and measure the resistance value R of the cylindrical permanent magnet sample obtained, and the permanent magnet sample electricalresistivityρ calculating cylindrical permanent magnet sample different pressures at such a temperature:
In formula, S is the cross-sectional area of sample; L
effor the distance between voltage detecting end.
5. repeat step 1. ~ step 4., measure the resistance value R of the cylindrical permanent magnet samples corresponding to pressure different under different temperatures, and calculate corresponding permanent magnet sample electricalresistivityρ.
Embodiment 2
Permanent magnetic material resistivity described in embodiment 1 is with the measuring method of temperature and pressure change, first on cylindrical permanent magnet sample, choose four different positions, the extension line of resistance measuring instrument and this four positions are contacted, outermost two positions of cylindrical permanent magnet sample are galvanic contact end, two positions inside cylindrical permanent magnet sample are voltage detecting end, then the resistance R of sample just directly can be obtained by resistance measuring instrument, according to measuring the sample resistance R obtained, the electricalresistivityρ calculating sample is:
In formula, S is the cross-sectional area of sample; L
effor the distance between voltage detecting end.Measure the method for permanent magnet material resistance and its resistivity of calculating, mainly utilize Kai Erwen four-end method.
Embodiment 3
Permanent magnetic material resistivity described in embodiment 1 is with the measuring method of temperature and pressure change, 3. in high pressure sealing bucket, the experiment oil of 95% is first injected according to step, then the cylindrical permanent magnet sample connected is put into high pressure sealing bucket, put into high pressure sealing bucket by being used for the high pressure resistant temperature sensor of monitor temperature and pressure transducer simultaneously simultaneously, make temperature sensor, pressure transducer and cylindrical permanent magnet sample are placed on same position height, after high pressure sealing bung is tight, the forcing pump that utilization is connected with high pressure sealing bucket raises the force value in high pressure sealing bucket, the size of force value reads by pressure transducer.
Embodiment 4
Permanent magnetic material resistivity described in embodiment 1 is with the measuring method of temperature and pressure change, according to step 1. with the outside surface 2. heating cable being closely wrapped in high pressure sealing bucket, and the end of heating cable is received in frequency and all adjustable AC power of amplitude, then insulating heat insulating material is superscribed at the outside surface of heating cable, utilize the temperature sensor in high pressure sealing bucket to monitor temperature in high pressure sealing bucket at any time, then regulate the output of AC power according to actual measurement.
Embodiment 5
Permanent magnetic material resistivity described in embodiment 1 is with the measuring method of temperature and pressure change, 1. with 2. direct, withstand voltage large power, electrically well heater is put into high pressure sealing bucket according to step, the lead-in wire of large power, electrically well heater is drawn by the sealing wire hole of high pressure sealing barrel top cover, and the lead-in wire of large power, electrically well heater is received in frequency and the adjustable AC power of amplitude, the temperature sensor in high pressure sealing bucket is utilized to monitor temperature in high pressure sealing bucket at any time equally, then the output of AC power is regulated as required, now high pressure bucket outside still needs to superscribe insulating heat insulating material.
Embodiment 6
Permanent magnetic material resistivity described in embodiment 1 is with the measuring method of temperature and pressure change, also can adopt and first regulate the force value in high pressure sealing bucket by forcing pump, then the temperature in adjustment high pressure sealing bucket, but force value actual in the high pressure sealing bucket pressure change that should be in high pressure sealing bucket caused by temperature adds the pressure change in the high pressure sealing bucket that forcing pump causes; Due to the temperature in high pressure sealing bucket, will to reach required temperature many slowly compared to the change of pressure, this just makes when regulating the temperature in high pressure sealing bucket, under permanent magnet sample is in high-pressure situations for a long time, this is unfavorable for the Long-Time Service of cylindrical permanent magnet sample, in view of above reason, recommend the measuring process adopting the present invention to propose.
In view of the singularity of permanent magnetic material application, to the measurement of its resistivity with temperature and pressure change, be made up of two identical processes, first process is that permanent magnet sample is not when magnetizing, measure the change of its resistivity with temperature and pressure, second process is after identical permanent magnet sample saturation magnetization, measures the change of its resistivity with temperature and pressure.
Not easily be processed into columniform permanent magnet sample for some and also permanent magnet sample can be processed into strip, the measuring principle for the permanent magnet sample of strip is identical with cylindrical permanent magnet sample with measuring process.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited in above-mentioned citing, and the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.
Claims (5)
1. permanent magnetic material resistivity is with a measuring method for temperature and pressure change, it is characterized in that: measure permanent magnetic material resistivity as follows with the step of temperature and pressure change:
1. the resistance value of cylindrical permanent magnet sample under normal temperature and pressure is first measured and record, again cylindrical permanent magnet sample is fixed on the insulating material, put into high pressure sealing bucket, afterwards, high pressure sealing bucket intimate be wound around heating cable or directly put in high pressure sealing bucket withstand voltage large power, electrically well heater/
2. heating cable or large power, electrically well heater are connected AC power, regulate the output voltage of AC power, temperature sensor probe in loading high pressure sealing bucket is utilized to observe the temperature value in the high pressure sealing bucket of temperature sensor display at any time, after reaching temperature required value, this temperature value is kept at least 30 minutes, and record temperature value now 1., then start to measure.
3. after the temperature of cylindrical permanent magnet sample is up to standard, regulate the forcing pump be connected with high pressure sealing bucket, force value in slow increase high pressure sealing bucket, observe the force value that pressure transducer shows, the force value degree of accuracy that pressure transducer shows is greater than the value shown by tensimeter on forcing pump, and closer to the actual value in high pressure sealing bucket.
4. the pressure value P of record shown by pressure transducer, and measure the resistance value R of the cylindrical permanent magnet sample obtained, and the permanent magnet sample electricalresistivityρ calculating cylindrical permanent magnet sample different pressures at such a temperature:
In formula, S is the cross-sectional area of sample; L
effor the distance between voltage detecting end.
5. repeat step 1. ~ step 4., measure the resistance value R of the cylindrical permanent magnet samples corresponding to pressure different under different temperatures, and calculate corresponding permanent magnet sample electricalresistivityρ.
2. permanent magnetic material resistivity according to claim 1 is with the measuring method of temperature and pressure change, it is characterized in that: on cylindrical permanent magnet sample, first choose four different positions, the extension line of resistance measuring instrument and this four positions are contacted, outermost two positions of cylindrical permanent magnet sample are galvanic contact end, two positions inside cylindrical permanent magnet sample are voltage detecting end, then the resistance R of sample just directly can be obtained by resistance measuring instrument, according to measuring the sample resistance R obtained, the electricalresistivityρ calculating sample is:
In formula, S is the cross-sectional area of sample; L
effor the distance between voltage detecting end.
3. permanent magnetic material resistivity according to claim 1 is with the measuring method of temperature and pressure change, it is characterized in that: in high pressure sealing bucket, 3. first inject the experiment oil of 95% according to step, then the cylindrical permanent magnet sample connected is put into high pressure sealing bucket, put into high pressure sealing bucket by being used for the high pressure resistant temperature sensor of monitor temperature and pressure transducer simultaneously simultaneously, make temperature sensor, pressure transducer and cylindrical permanent magnet sample are placed on same position height, after high pressure sealing bung is tight, the forcing pump that utilization is connected with high pressure sealing bucket raises the force value in high pressure sealing bucket, the size of force value reads by pressure transducer.
4. permanent magnetic material resistivity according to claim 1 is with the measuring method of temperature and pressure change, it is characterized in that: according to step 1. with the outside surface 2. heating cable being closely wrapped in high pressure sealing bucket, and the end of heating cable is received in frequency and all adjustable AC power of amplitude, then insulating heat insulating material is superscribed at the outside surface of heating cable, utilize the temperature sensor in high pressure sealing bucket to monitor temperature in high pressure sealing bucket at any time, then regulate the output of AC power according to actual measurement.
5. permanent magnetic material resistivity according to claim 1 is with the measuring method of temperature and pressure change, it is characterized in that: 1. with 2. direct, withstand voltage large power, electrically well heater is put into high pressure sealing bucket according to step, the lead-in wire of large power, electrically well heater is drawn by the sealing wire hole of high pressure sealing barrel top cover, and the lead-in wire of large power, electrically well heater is received in frequency and the adjustable AC power of amplitude, the temperature sensor in high pressure sealing bucket is utilized to monitor temperature in high pressure sealing bucket at any time equally, then the output of AC power is regulated as required, now high pressure bucket outside still needs to superscribe insulating heat insulating material.
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Citations (7)
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| JPH11243236A (en) * | 1998-02-26 | 1999-09-07 | Hitachi Metals Ltd | Magnetoresistive element |
| JP2003229614A (en) * | 2002-02-05 | 2003-08-15 | Mitsubishi Electric Corp | Magnetic material, magnetoresistance effect device using such magnetic material and magnetic device using such magneto resistive effect device |
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| CN104635054A (en) * | 2015-02-11 | 2015-05-20 | 华北电力大学 | Closed-type temperature control solid medium electrical resistivity measurement device |
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2015
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Patent Citations (7)
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| JPH11243236A (en) * | 1998-02-26 | 1999-09-07 | Hitachi Metals Ltd | Magnetoresistive element |
| JP2003229614A (en) * | 2002-02-05 | 2003-08-15 | Mitsubishi Electric Corp | Magnetic material, magnetoresistance effect device using such magnetic material and magnetic device using such magneto resistive effect device |
| CN102305804A (en) * | 2011-05-19 | 2012-01-04 | 北京鼎臣超导科技有限公司 | Device and method for measuring superconducting transition temperature of high temperature superconducting material |
| CN102507725A (en) * | 2011-10-28 | 2012-06-20 | 北京航空航天大学 | Measuring device and measuring method of superconductive AC magnetic susceptibility |
| CN103675452A (en) * | 2012-09-07 | 2014-03-26 | 中国石油化工股份有限公司 | Rock resistivity testing system and method capable of simulating reservoir conditions |
| CN202975167U (en) * | 2012-12-18 | 2013-06-05 | 盐城工学院 | Test system for synchronously measuring and reading resistivity irregular factor in consolidation experiment |
| CN104635054A (en) * | 2015-02-11 | 2015-05-20 | 华北电力大学 | Closed-type temperature control solid medium electrical resistivity measurement device |
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| 郭红力等: "高压退火对0.65PMN-0.35PT薄膜结构、形貌及电学性能的影响", 《物理学报》 * |
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Inventor after: Zou Jibin Inventor after: Xiao Lijun Inventor after: Xu Yongxiang Inventor after: Yu Guodong Inventor after: Zou Jiming Inventor before: Zou Jibin Inventor before: Xiao Lijun Inventor before: Xu Yongxiang Inventor before: Zhao Bo Inventor before: Li Yong Inventor before: Shang Jing Inventor before: Wang Jian Inventor before: Zhao Meng |
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