CN103576107B - A kind of method and device thereof of measuring overall magnetostriction coefficient - Google Patents
A kind of method and device thereof of measuring overall magnetostriction coefficient Download PDFInfo
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- CN103576107B CN103576107B CN201310511420.1A CN201310511420A CN103576107B CN 103576107 B CN103576107 B CN 103576107B CN 201310511420 A CN201310511420 A CN 201310511420A CN 103576107 B CN103576107 B CN 103576107B
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Abstract
Measure method and the device thereof of overall magnetostriction coefficient, belong to material property detection technique field. Improve original capacitance sensor measuring mechanism, utilize capacitance sensor directly to measure the overall magnetostriction coefficient of material; The magnetic field that solenoid provides is large without remanent magnetism, homogeneity range. Detected sample (3) changes capacitance sensor pole plate A(21 with changes of magnetic field generation length variations) with capacitance sensor pole plate B(22) variation of spacing, capacitance sensor (2) detects that polar plate spacing changes and then obtains detected sample magnetostriction coefficient. The present invention has the following advantages: adopt solenoid to apply magnetic field, effectively avoid the problems such as electromagnet magnetic field homogeneity is poor, remanent magnetism; Adopt capacitance sensor to measure magnetostriction coefficient, can complete the high-acruracy survey of detected sample entirety magnetostriction coefficient; Adopt nonmagnetic substance to make press rods, avoided the impact of press rods on magnetic field homogeneity; Simple to operate, convenient operation person measures.
Description
Technical field
The invention belongs to material property detection technique field, relate to a kind of method of measuring overall magnetostriction coefficient andDevice.
Background technology
From the eighties in 20th century intellectual material concept propose, such Material Physics mechanism, preparation technology and be in intelligenceThe aspects such as the application in system and structure become rapidly study hotspot. And in intellectual material, occupy the magnetostriction material of critical roleMaterial is the material that variation that a class can perception external magnetic field produces self change in size. The table of magnetostriction materials performance qualityLevy by magnetostriction coefficient λ and illustrate, axially the applying after magnetic field H of the bar-shaped magnetostriction materials that are L along length, material productionThe elongation of Δ L, definition Δ L/L=λ.
At present, the method for measurement magnetostriction coefficient mainly contains electric resistance strain film method, capacitance method, electric vortex method, the interference of lightMethod, optical lever method etc. Production unit mainly adopts in one's power is electric resistance strain film method in present vast Research Center, and this method is profitBe out of shape and cause resistance strain gage distortion with magnetostriction, and resistance strain gage distortion must bring resistance variations, by measuring electricityResistiveization just can obtain magnetostriction coefficient indirectly. This method is simple in structure, easy to use, highly sensitive, measuring speedHurry up, can realize multimetering and test process automation, technique comparative maturity, is convenient to choice and operation. But resistance strain gageAlso there is certain deficiency in method, being mainly manifested in resistance strain gage must well bond together with sample, and bonding agent is manyI haven't seen you for ages affects measurement result; Welding, the length of resistance strain gage lead-in wire can affect measurement result; The main survey bureau of resistance strain gagePortion's strain, and actual use is mainly that entirety is used. Capacitance method is two electricity that the length variations of measurement magnetostriction materials causesHold the variation of polar plate spacing, length variations be converted into capacitance variations, it have highly sensitive, frequency response fast, good stability,Output signal is directly changed into electric weight, it is contactless to be measured as, do not produce the feature such as dynamometry distortion, entirety measurement. But capacitance methodWhen measurement, need to ensure that pole plate is parallel, this there are certain requirements sample clamp. Electric vortex method utilizes current vortex sensor excitatoryAfter power frequency and measured conductor (magnetostriction materials) are determined, the size of its oscillating circuit output is only with end face and measured objectGap changes and changes, and the signal of telecommunication of exporting by measurement just can calculate magnetostriction coefficient. The advantage of electric vortex method and electricityAppearance method is basic identical, but because of its impact that is more subject to changes of magnetic field, is generally only suitable for surveying static magnetostriction. Optical lever method profitCause that with magnetostriction spot displacement changes, obtain magnetostriction coefficient by detecting facula position. Although this method structureSimply, but the installation inconvenience of sample is stricter to environmental requirement. Optical interferometry is also a kind of non-contact measurement,Utilize the interference of beam of laser to may detect the minimum displacement for 1nm. But the adjustment of this method sample installation and light path veryInconvenience, requires higher to operator's experimental skill.
Magnetostriction measurement equipment, also needs magnetic field to provide and establishes suitable magnetostriction coefficient checkout equipment except selectingStandby. At present, provide the major way in magnetic field to have two kinds: electromagnet and solenoid. Electromagnet in use, need to will be measured sampleBe placed between two yokes, sample length will affect space length between two yokes. And space length difference, magnetic field homogeneity is notWith. Long sample the inhomogeneous of its Surface field in the time measuring will affect measurement result. Meanwhile, after long-term use, electromagnet ironCore is had remanent magnetism by remagnetization and exists. Solenoid simple structure, easy to use, after energising, in solenoid, produce axial magnetic, and intensity and the sexual intercourse of electric current retention wire, can there is in solenoid central area very long homogeneity range. But exist after energisingThe problem that caloric value is large will be noted heat radiation in long-time use procedure. Meanwhile, perhaps also has the impact of electromagnetic radiation.
Summary of the invention
The present invention is directed in current magnetostriction measurement method: strain gauge method cannot be measured overall magnetostriction; Its other partyAlthough method can be measured overall magnetostriction, has device structure complexity, operator is required to the problems such as high; Electromagnet cannot be carriedFor large uniform magnetic field scope, there is the problems such as remanent magnetism phenomenon, provide a kind of method of measuring overall magnetostriction coefficient andDevice.
Measure method and the device thereof of overall magnetostriction coefficient, concrete measuring process is:
1. sample is installed. Detected sample 3 is placed in the middle of capacitance sensor pole plate A21 and capacitance sensor pole plate B22.
2. regulate on demand pressure to apply and transport platform 5, by press rods 4 detected sample 3 stress applications.
3. capacitance sensor 2 positions are adjusted: front and back control capacittance sensor 2 is in the position of capacitance sensor pole plate A21, withEnsure that the length variations causing because of detected sample 3 in measuring process is in capacitance sensor 2 measurement categorys.
4. apply with pressure and transport platform 5 pushes solenoid homogeneity range 11 centre positions along conveying 6 by detected sample 3.
5. power to solenoid coil 12, the magnetostriction that capacitance sensor 2 detects detected sample 3 changes, and completes mangneto and stretchesContracting is measured.
Adopt solenoid 1 that electromagnetic field is provided, the electromagnetic field intensity providing is by the current strength I and the coil turn that pass into whereinNumber n decision, need to determine solenoid homogeneity range 11 in conjunction with the maximum length of detected sample 3, and detected sample 3 length need to be less than solenoidHomogeneity range 11 length. The calculating of electromagnetic field intensity H can be with reference to formula:
Wherein H be in solenoid apart from central point the magnetic field intensity apart from x place, 2L is solenoid length, 2r1For line solenoidCircle internal diameter, 2r2For solenoid coil external diameter, design spiral pipeline circle 12 accordingly. For preventing that solenoid 1 duration of work from producing heatCause self and the 11 temperature rise impacts of solenoid homogeneity range to use, can in solenoid coil 12, add circulating water line systemSystem.
Pressure applies and transport platform 5 can be exerted pressure to detected sample 3 by press rods 4, to fix detected sample 3 and to measureIts Magnetostriction under certain pressure. The material of press rods 4 need be manufactured by nonmagnetic substance. Pressure applies and transport platform5 can move along conveying 6, and detected sample 3 is placed into solenoid homogeneity range 11 centre positions.
Detected sample 3 is placed in the middle of capacitance sensor pole plate A21 and capacitance sensor pole plate B22, and is placed on spiral shell while measuringSpool homogeneity range 11 centre positions. Capacitance sensor 2 is fixed on capacitance sensor pole plate A21. When measurement, follow the change in magnetic fieldChange, detected sample 3 length variations change capacitance sensor pole plate A21 and capacitance sensor pole plate B22 spacing, are fixed on capacitance sensingCapacitance sensor 2 on device pole plate A21 can detect this variation, and output electrical signals, known magnetostriction after conversionCoefficient.
The material that press rods 4 adopts is nonmagnetic substance, is preferably magnetism-free stainless steel.
The invention has the beneficial effects as follows:
1. adopt solenoid to apply magnetic field, effectively avoid the problems such as electromagnet magnetic field homogeneity is poor, remanent magnetism.
2. adopt capacitance sensor to measure magnetostriction coefficient, can complete the high-precision of detected sample entirety magnetostriction coefficientDegree is measured.
3. adopt nonmagnetic substance to make press rods, avoided the impact of press rods on magnetic field homogeneity.
4. simple to operate, convenient operation person measures.
Brief description of the drawings
Fig. 1 is solenoid schematic diagram of the present invention.
In figure: 1--solenoid, 11--solenoid homogeneity range, 12--solenoid coil.
Fig. 2 is overall test desk schematic diagram of the present invention.
2--capacitance sensor, 21--capacitance sensor pole plate A, 22--capacitance sensor pole plate B, 3--detected sample, 4--pressPower bar, 5--pressure applies and transport platform, 6--conveying.
Fig. 3 is<110>orientation Tb0.27Dy0.73Fe1.95Entirety magnetostriction coefficient.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further described, but not as a limitation of the invention.
1. sample is installed. This measures material of sample be<110>Tb that is orientated0.27Dy0.73Fe1.95, length is 60mm,Diameter is 12mm. Detected sample (3) is placed on capacitance sensor pole plate A(21) and capacitance sensor pole plate B(22) in the middle of.
2. regulate on demand pressure to apply and transport platform (5), by press rods (4) detected sample (3) stress application, this measurementPressure is 20MPa.
3. capacitance sensor (2) position is adjusted. Front and back control capacittance sensors (2) are at capacitance sensor pole plate A(21)Position, with the length variations that ensures to cause because of detected sample (3) in measuring process in capacitance sensor (2) measurement category.
4. apply with pressure and transport platform (5) pushes detected sample (3) in solenoid homogeneity range (11) along conveying (6)Between position.
5. give solenoid coil (12) power supply, the magnetostriction that capacitance sensor (2) detects detected sample (3) changes, and completesMagnetostriction measurement. As shown in Figure 2, Fig. 2 is the knot of three independent measurement same material magnetostriction coefficients to concrete measurement resultReally. Visible this method can realize the overall magnetostriction coefficient of high-acruracy survey material.
Claims (4)
1. measure a method for overall magnetostriction coefficient, it is characterized in that utilizing capacitance sensor to measure the overall magnetic of materialCause coefficient of dilatation; Solenoid can provide magnetic field for experiments of measuring simultaneously; Concrete measuring process is as follows:
1). sample is installed: detected sample (3) is placed on capacitance sensor pole plate A(21) and capacitance sensor pole plate B(22) in the middle of,Capacitance sensor (2) is fixed on capacitance sensor pole plate A(21) on;
2). regulate on demand pressure to apply and transport platform (5), by pressure apply and transport platform in press rods (4) to testedSample (3) stress application;
3). capacitance sensor (2) position adjust: front and back control capacittance sensors (2) are at capacitance sensor pole plate A(21) positionPut, with the length variations that ensures to cause because of detected sample (3) in measuring process in capacitance sensor (2) measurement category;
4). apply and transport platform (5) pushes detected sample (3) in the middle of solenoid homogeneity range (11) along conveying (6) with pressurePosition;
5). give solenoid coil (12) power supply, the magnetostriction that capacitance sensor (2) detects detected sample (3) changes, and completes mangnetoFlexible measurement;
Wherein, adopt solenoid (1) that electromagnetic field is provided, the electromagnetic field intensity providing is by the current strength I and the line that pass into whereinCircle number of turn n decision, need to determine solenoid homogeneity range (11) in conjunction with the maximum length of detected sample (3), and detected sample (3) length is less thanSolenoid homogeneity range (11) length; The computing formula of electromagnetic field intensity is:
, wherein H is spiral shellIn spool apart from central point the electromagnetic field intensity apart from x place, 2L is solenoid length, 2r1For solenoid coil internal diameter, 2r2For helicalPipe coil outer diameter, accordingly design spiral pipeline circle (12).
2. the method for the overall magnetostriction coefficient of measurement according to claim 1, is characterized in that: press rods (4) is adoptedWith nonmagnetic substance be magnetism-free stainless steel.
3. the method for the overall magnetostriction coefficient of measurement according to claim 1, is characterized in that: detected sample (3) lengthChange and change capacitance sensor pole plate A(21) and capacitance sensor pole plate B(22) spacing, be fixed on capacitance sensor pole plate A(21) capacitance sensor (2) on can detect this variation, and output electrical signals, and after conversion, known magnetostriction isNumber.
4. the method for the overall magnetostriction coefficient of measurement according to claim 1, is characterized in that: for preventing solenoid(1) duration of work generation heat causes self and solenoid homogeneity range (11) temperature rise impact to use, at solenoid coil(12) in, add circulating water line system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2739161C1 (en) * | 2020-04-07 | 2020-12-21 | федеральное государственное бюджетное образовательное учреждение высшего образования "Новгородский государственный университет имени Ярослава Мудрого" | Method of measuring magnetostriction of thin films |
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| CN106802399B (en) * | 2016-12-05 | 2019-04-30 | 中国计量科学研究院 | A kind of measuring system and method for magnetostriction coefficient |
| CN108801154A (en) * | 2018-07-02 | 2018-11-13 | 中国计量科学研究院 | Using the measuring apparatus and method of the magnetostriction material in large of Double passage laser displacement method |
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| CN110375656B (en) * | 2019-07-09 | 2021-08-13 | 武汉钢铁有限公司 | Measuring device and measuring method for magnetostriction coefficient |
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| RU194787U1 (en) * | 2019-10-21 | 2019-12-23 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Петрозаводский государственный университет" | LABORATORY STAND FOR MEASURING THE DEPENDENCE OF MAGNETOSTRICTION OF A RIGID OBJECT ON THE VALUE OF AN EXTERNAL MAGNETIC FIELD |
| CN110703167B (en) * | 2019-10-23 | 2021-10-22 | 中国人民解放军军事科学院国防科技创新研究院 | Obtaining Fe3GeTe2Method of magnetostriction coefficient of |
| CN114236438B (en) * | 2021-12-20 | 2023-03-31 | 中国石油大学(华东) | Measuring device and measuring method for magnetic parameters of giant magnetostrictive material |
| CN114114107B (en) * | 2022-01-26 | 2022-04-15 | 山东理工大学 | Magnetostrictive micro deformation measurement experimental device |
| CN117907692B (en) * | 2024-01-09 | 2024-08-20 | 华中科技大学 | Capacitance measuring device and method under pulse strong magnetic field |
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