CN102226682A - A strain measurement device for fusion superconducting magnets - Google Patents
A strain measurement device for fusion superconducting magnets Download PDFInfo
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- CN102226682A CN102226682A CN2011100758773A CN201110075877A CN102226682A CN 102226682 A CN102226682 A CN 102226682A CN 2011100758773 A CN2011100758773 A CN 2011100758773A CN 201110075877 A CN201110075877 A CN 201110075877A CN 102226682 A CN102226682 A CN 102226682A
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- 230000004927 fusion Effects 0.000 title claims abstract description 11
- 238000005259 measurement Methods 0.000 title description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 15
- 239000010935 stainless steel Substances 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 239000010949 copper Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 14
- 230000002277 temperature effect Effects 0.000 description 7
- 239000004020 conductor Substances 0.000 description 6
- 230000005284 excitation Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000001915 proofreading effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
一种用于聚变超导磁体的应变测量装置，包括补偿块(2)、工作应变片(3)、补偿应变片(4)和屏蔽罩(5)；所述的工作应变片(3)粘贴在超导磁体(1)的不锈钢铠甲表面；补偿块(2)安装在工作应变片(3)附近，固定在超导磁体(1)的不锈钢铠甲表面；补偿块(2)近似为L形状，L形补偿块(2)的长边表面与超导磁体(1)的不锈钢铠甲表面平行；L形补偿块(2)的长边下表面粘贴了补偿应变片(4)；补偿应变片(4)的位置与工作应变片(3)的位置上下对称；补偿块(2)上除贴有补偿应变片(4)的表面外，其余表面上均镀有50微米的铜膜。补偿应变片(4)与工作应变片(3)所在位置的磁场强度近似相同。
A strain measuring device for a fusion superconducting magnet, comprising a compensation block (2), a working strain gauge (3), a compensation strain gauge (4) and a shield (5); the working strain gauge (3) is pasted On the surface of the stainless steel armor of the superconducting magnet (1); the compensation block (2) is installed near the working strain gauge (3), fixed on the surface of the stainless steel armor of the superconducting magnet (1); the compensation block (2) is approximately L-shaped, The long side surface of the L-shaped compensation block (2) is parallel to the surface of the stainless steel armor of the superconducting magnet (1); the lower surface of the long side of the L-shaped compensation block (2) is pasted with a compensation strain gauge (4); the compensation strain gauge (4) ) and the position of the working strain gauge (3) are symmetrical up and down; except the surface on which the compensation strain gauge (4) is pasted on the compensation block (2), the remaining surfaces are plated with a copper film of 50 microns. The magnetic field intensity at the location of the compensation strain gauge (4) and the working strain gauge (3) is approximately the same.
Description
Technical field
The present invention relates to a kind of strain gauge means of superconducting magnet.
Background technology
Large-scale fusion superconducting magnet system has the characteristics that electric current is big, field intensity is high, energy storage is big usually when operation.Because the interaction in electric current and magnetic field, huge electromagnetic force may produce local train and concentrate, local big strain will cause epoxy resin to break, the mechanical disturbance that is brought will cause superconducting magnet quench under extremely low electric current and epoxy resin breaks, do not reach the practical design requirement, also will cause the damage of superconducting magnet under the serious situation, thereby produce enormous economic loss.Therefore, the mechanical stress strain analysis is the important part of SUPERCONDUCTING MAGNET DESIGN.At present, the ess-strain problem that adopts finite element (FE) method research superconducting magnet under various operating modes, (, to lower the temperature excitation etc.) usually as pretension.In addition, before the superconducting magnet system operation, in conjunction with the FE analysis result, also must the strain of strain gauge means with the various structured materials of accurate measurement be installed in big ess-strain position, to monitor the stressing conditions of magnet under various operating modes, determine the security of magnet structure, and check the precision of mechanical ess-strain FEM (finite element) calculation.
Resistance strain gage is because volume is little, can be under the strong magnetic environment of low temperature operate as normal, principle is simple, measures advantages such as intuitive and convenient, thereby is applied to the strain measurement of large-scale fusion superconducting magnet widely.As the EAST tokamak of China, the KASTAR tokamak of Korea S etc. has all adopted resistance strain gage to measure strain.Yet the sensitivity of resistance strain gage changes with the variation in temperature and magnetic field, promptly so-called temperature effect and magnetoresistance.How eliminating the influence of temperature effect and magnetoresistance, is the key of utilizing resistance strain gage accurately to measure.Usually, before using resistance strain gage, resistance strain gage is proofreaied and correct experiment, obtain the matched curve that concerns between strain gage testing strain and temperature and the magnetic field intensity, thereby provide reference for the measurement of resistance strain gage under the strong magnetic environment of low temperature.Yet, to proofread and correct experiment and build complexity, cost is big, and proofreading and correct as a result, precision is difficult to guarantee.At present, extensively adopt dummy gauge to eliminate the temperature effect and the magnetoresistance of working strain gauge, as document [JingQian, Peide Weng, Jiarong Luo, Zhuomin Chen, and Yu Wu.Measurement System in Large-ScaleSuperconducting Magnet Performance Test.IEEE Trans.Appl.Supercond., vol.20, NO.5,2010.pp2312-2316] described.Yet present strain gauge means adopts three-wire system to connect usually, is subjected to the influence of lead self-resistance bigger.In addition, strain gauge means is subjected to the influence of electromagnetic interference (EMI) and self-heating also bigger.These disturbing factors all will influence the measuring accuracy of strain gauge means.Therefore, must develop that influenced by temperature effect and magnetoresistance little, the strain gauge means that antijamming capability is strong.
Summary of the invention
The objective of the invention is to overcome existing strain gauge means and be subjected to temperature effect and magnetoresistance to influence big shortcoming, provide a kind of antijamming capability strong superconducting magnet strain gauge means.This strain gauge means is particularly useful for large-scale fusion superconducting magnet system, accurately the strain of Measurement of Superconducting Magnet system each structured material under different operating modes.
Strain gauge means of the present invention mainly comprises compensation block, working strain gauge, dummy gauge and radome.Being electrically connected of strain gauge means of the present invention is 1/4 bridge diagram, work strain sheet resistance and compensate for strain sheet resistance insert adjacent two brachium pontis of electric bridge respectively, insert the first fixing fixing arm resistance of arm resistance and second on two other brachium pontis of electric bridge respectively, described four brachium pontis have constituted 1/4 bridge diagram.
Described working strain gauge sticks on the stainless steel armor surface of superconducting magnet, is used for the strain of Measurement of Superconducting Magnet.For temperature effect and the magnetoresistance of eliminating working strain gauge, compensation block has been installed near working strain gauge.Compensation block is approximately L shaped shape, is fixed on the stainless steel armor surface of superconducting magnet, and the surface, long limit of L shaped compensation block is parallel with the stainless steel armor surface of superconducting magnet.Lower surface on L shaped compensation block length limit has been pasted dummy gauge.The position of dummy gauge and the position of working strain gauge be symmetry up and down, and the vertical range up and down between dummy gauge and the working strain gauge is very little, makes dummy gauge approximate identical with the magnetic field intensity of working strain gauge position.Compensation block adopts stainless steel material to make, and is identical with the armor material of superconducting magnet.In order to make dummy gauge approximate identical, on the compensation block, except that the surface that is pasted with dummy gauge, on the remaining surface of compensation block, all be coated with copper film with the temperature of working strain gauge.Because the good heat conductive characteristic of copper, the temperature difference between dummy gauge and the working strain gauge will be dwindled.In addition, radome also has been installed around compensation block, working strain gauge and dummy gauge.Radome adopts aluminum to make, and is rectangular shape.Radome not only can weaken the influence of electromagnetic interference (EMI) to working strain gauge and dummy gauge, can also play mechanical protection to compensation block, working strain gauge and dummy gauge.
Described working strain gauge and dummy gauge are resistance strain gage.Aspect being electrically connected of strain gauge means of the present invention, work strain sheet resistance and compensate for strain sheet resistance insert adjacent two brachium pontis of electric bridge respectively, insert the first fixing fixing arm resistance of arm resistance and second on two other brachium pontis of electric bridge respectively, described four brachium pontis have constituted 1/4 bridge diagram.Because working strain gauge and the residing temperature magnetic field environment of dummy gauge are basic identical, the resistance value of pyromagnetic resistance of working strain gauge and the pyromagnetic resistance of dummy gauge is in full accord, and in 1/4 bridge diagram, subtract each other and be eliminated owing to symmetry, be the disturbing effect that working strain gauge has been avoided the pyromagnetic resistance of working strain gauge, the strain that working strain gauge is surveyed is entirely the strain that superconducting magnet institute location is put.
Described first fixedly arm resistance and second fixedly the resistance value of arm resistance be 350 ohm, identical with the resistance value of work strain sheet resistance and compensate for strain sheet resistance.Direct supply links to each other with a diagonal line of 1/4 bridge diagram, so that bridge excitation to be provided.First universal electric meter links to each other with another diagonal line of 1/4 bridge diagram, is used for the measuring bridge output voltage.In addition, the stube cable of 1/4 bridge diagram and direct supply is generally longer, and stube cable resistance is bigger.For the influence to strain gauge means of first conductor resistance of eliminating cable and second conductor resistance, in the place of dc supply input near strain gauge means, second universal electric meter in parallel is with accurate measuring bridge driving voltage.Generally speaking, strain gauge means of the present invention has adopted the five-wire system connection, be that an end of working strain gauge is drawn two leads and is connected with the positive pole of second universal electric meter, direct supply respectively, one end of dummy gauge is drawn two leads and is connected with the negative pole of second universal electric meter, direct supply respectively, and working strain gauge is drawn a lead with the common port of dummy gauge and is connected with first universal electric meter.Five-wire system connects can effectively avoid the influence of the resistance of stube cable to the strain measuring accuracy.
The present invention is simple in structure, adopt compensation method to eliminate the influence of temperature and magnetoresistance to working strain gauge, by reduced the temperature difference between working strain gauge and the dummy gauge at copper plating film on the compensation block, adopt five-wire system to connect and eliminated of the influence of stube cable resistance, satisfy the accurate strain measurement requirement of the especially large-scale fusion superconducting magnet of superconducting magnet strain measurement.
Description of drawings
Fig. 1 is the structural representation of strain gauge means of the present invention, among the figure: 1 superconducting magnet, 2 compensation blocks, 3 working strain gauges, 4 dummy gauges, 5 radomes;
Fig. 2 is the circuit connection diagram of strain gauge means of the present invention, and among the figure: 6 work strain sheet resistances, 7 compensate for strain sheet resistances, 8 first are fixedly arm resistance, the pyromagnetic resistance of 10 working strain gauges, the pyromagnetic resistance of 11 dummy gauges, 12 first conductor resistances, 13 second conductor resistances, 14 first universal electric meters, 15 second universal electric meters, 16 direct supplys of arm resistance, 9 second fixedly.
Embodiment:
The present invention is further described below in conjunction with the drawings and specific embodiments.
Strain gauge means of the present invention mainly comprises compensation block 2, working strain gauge 3, dummy gauge 4 and radome 5.
As shown in Figure 1, working strain gauge 3 sticks on the stainless steel armor surface of superconducting magnet 1, is used for the strain of Measurement of Superconducting Magnet 1.The strain that the alite paste that is adopted can be put institute's location passes to working strain gauge 3 exactly.For temperature effect and the magnetoresistance of eliminating working strain gauge 3, compensation block 2 has been installed near the working strain gauge 3.Compensation block 2 is approximately L shaped shape, by the stainless steel armor surface of a M6 screw retention in superconducting magnet 1, makes the surface, long limit of L shaped compensation block 2 parallel with the stainless steel armor surface of superconducting magnet 1.Lower surface has been pasted dummy gauge 4 on the long limit of L shaped compensation block 2.The position of the position of dummy gauge 4 and working strain gauge 3 is symmetry up and down, and the vertical range up and down between dummy gauge 4 and the working strain gauge 3 is very little, is about 5 millimeters, makes dummy gauge 4 approximate identical with the magnetic field intensity of working strain gauge 3 positions.Compensation block 2 adopts stainless steel material to make, and is identical with the armor material of superconducting magnet 1.In order to make dummy gauge 4 approximate identical, on the compensation block 2, except that the surface of posting dummy gauge 4, all be coated with 50 microns copper film on the remaining surface of compensation block 2 with the temperature of working strain gauge 3.Because the good heat conductive characteristic of copper, the temperature difference between dummy gauge 4 and the working strain gauge 3 will be contracted to 0.4K.In addition, radome 5 also has been installed around compensation block 2, working strain gauge 3 and dummy gauge 4.Radome 5 adopts aluminum to make, and is rectangular shape, thick 1 millimeter, is connected with compensation block 2 by four M3 screws.Radome 5 not only can weaken the influence of electromagnetic interference (EMI) to working strain gauge 3 and dummy gauge 4, can also play mechanical protection to compensation block 2, working strain gauge 3 and dummy gauge 4.
As shown in Figure 2, strain gauge means of the present invention is electrically connected the employing bridge diagram.Work strain sheet resistance 6 and compensate for strain sheet resistance 7 insert two adjacent brachium pontis of electric bridge respectively, insert the first fixing fixing arm resistance 9 of arm resistance 8 and second on other two brachium pontis respectively, and described four brachium pontis have constituted 1/4 bridge diagram.Because working strain gauge 3 and dummy gauge 4 residing temperature magnetic field environments are basic identical, the resistance value of pyromagnetic resistance 10 of working strain gauge and the pyromagnetic resistance 11 of dummy gauge is in full accord, and in 1/4 bridge diagram, subtract each other and be eliminated owing to symmetry, be the disturbing effect that working strain gauge 3 has been avoided the pyromagnetic resistance 10 of working strain gauge, the strain that working strain gauge 3 is surveyed is entirely the strain that 1 location of superconducting magnet is put.
First fixedly arm resistance 8 and second fixedly the resistance value of arm resistance 9 be 350 ohm, identical with the resistance value of work strain sheet resistance 6 and compensate for strain sheet resistance 7.Direct supply 16 links to each other with a diagonal line of 1/4 bridge diagram, so that bridge excitation to be provided.First universal electric meter 14 links to each other with another diagonal line of 1/4 bridge diagram, is used for the measuring bridge output voltage.In addition, the stube cable of 1/4 bridge diagram and direct supply 16 is generally longer, about 50 meters.For first conductor resistance 12 of eliminating cable and the influence of 13 pairs of strain gauge means of second conductor resistance, in the place of direct supply 16 input ends near strain gauge means, second universal electric meter 15 in parallel is with accurate measuring bridge driving voltage.Generally speaking, strain gauge means of the present invention has adopted the five-wire system connection, be that an end of working strain gauge 3 is drawn two leads and is connected with the positive pole of second universal electric meter 15, direct supply 16 respectively, one end of dummy gauge 4 is drawn two leads and is connected with the negative pole of second universal electric meter 15, direct supply 16 respectively, and working strain gauge 3 is drawn a lead with the common port of dummy gauge 4 and is connected with first universal electric meter 14.Five-wire system connects can effectively avoid the influence of the resistance of stube cable to the strain measuring accuracy.
The content that is not described in detail in the instructions of the present invention belongs to this area professional and technical personnel's known prior art.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100758773A CN102226682A (en) | 2011-03-29 | 2011-03-29 | A strain measurement device for fusion superconducting magnets |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100758773A CN102226682A (en) | 2011-03-29 | 2011-03-29 | A strain measurement device for fusion superconducting magnets |
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| CN102226682A true CN102226682A (en) | 2011-10-26 |
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| CN2011100758773A Pending CN102226682A (en) | 2011-03-29 | 2011-03-29 | A strain measurement device for fusion superconducting magnets |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487177A (en) * | 2013-09-05 | 2014-01-01 | 华中科技大学 | Method and device for measuring metallized film capacitor interlayer pressure intensity |
| CN110553596A (en) * | 2019-08-23 | 2019-12-10 | 中国科学院合肥物质科学研究院 | comprehensive monitoring and diagnosis system applied to internal components of fusion reactor device |
| CN113607970A (en) * | 2021-08-10 | 2021-11-05 | 镇江明润信息科技有限公司 | Method and device for measuring rotating speed by using centrifugal force |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4510813A (en) * | 1981-12-23 | 1985-04-16 | Kabushiki Kaisha Ishida Koki Seisakusho | Temperature compensation circuit for strain gauges |
| WO1997021083A1 (en) * | 1995-12-04 | 1997-06-12 | Societe Nationale D'etude Et De Construction De Mo | Wheatstone bridge with temperature gradient compensation |
-
2011
- 2011-03-29 CN CN2011100758773A patent/CN102226682A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4510813A (en) * | 1981-12-23 | 1985-04-16 | Kabushiki Kaisha Ishida Koki Seisakusho | Temperature compensation circuit for strain gauges |
| WO1997021083A1 (en) * | 1995-12-04 | 1997-06-12 | Societe Nationale D'etude Et De Construction De Mo | Wheatstone bridge with temperature gradient compensation |
Non-Patent Citations (3)
| Title |
|---|
| JING QIAN等: "Measurement System in Large-Scale Superconducting Magnet Performance Test", 《IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY》 * |
| 袁成友等: "电阻应变式传感器的温度误差及其补偿", 《中国井矿盐》 * |
| 陈巨兵等: "《工程力学实验教程》", 1 May 2007 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487177A (en) * | 2013-09-05 | 2014-01-01 | 华中科技大学 | Method and device for measuring metallized film capacitor interlayer pressure intensity |
| CN103487177B (en) * | 2013-09-05 | 2015-07-08 | 华中科技大学 | Method and device for measuring interlayer pressure of metallized film capacitor |
| CN110553596A (en) * | 2019-08-23 | 2019-12-10 | 中国科学院合肥物质科学研究院 | comprehensive monitoring and diagnosis system applied to internal components of fusion reactor device |
| CN113607970A (en) * | 2021-08-10 | 2021-11-05 | 镇江明润信息科技有限公司 | Method and device for measuring rotating speed by using centrifugal force |
| CN113607970B (en) * | 2021-08-10 | 2024-06-04 | 镇江明润信息科技有限公司 | Method and device for measuring rotating speed by utilizing centrifugal force |
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Application publication date: 20111026 |