CN103293506A - Achieving method for conductivity measurement instrument without detecting front test block calibration - Google Patents
Achieving method for conductivity measurement instrument without detecting front test block calibration Download PDFInfo
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- CN103293506A CN103293506A CN2013102379446A CN201310237944A CN103293506A CN 103293506 A CN103293506 A CN 103293506A CN 2013102379446 A CN2013102379446 A CN 2013102379446A CN 201310237944 A CN201310237944 A CN 201310237944A CN 103293506 A CN103293506 A CN 103293506A
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Abstract
The invention discloses an achieving method for a conductivity measurement instrument without detecting front test block calibration. According to the characteristic that after parameters of an eddy current detecting instrument and an eddy current transducer are fixed, an eddy current detecting signal phase of a metal material is constant under the same detecting frequency, a phase-conductivity relation curve function model and a metal conductivity temperature compensation function model are arranged in the eddy current detecting instrument, and a temperature measuring sensor component is integrated in the eddy current detecting instrument. Before the metal conductivity is measured, a standard conductivity test block is not required to be used for calibrating the eddy current detecting instrument, and reliability and convenience of conductivity measuring efficiency and detecting results are greatly improved.
Description
Affiliated technical field
The present invention relates to a kind of implementation method of the cannot-harm-detection device, particularly relate to a kind of need not to detect before the implementation method of the conductivity measurement instrument demarcated of test block.
Background technology
The measurement of conductivity is to utilize eddy current device to measure the conductivity value of non-ferromagnetic metal, can carry out the evaluation of the discriminating of sorting, condition of heat treatment of material and hardness, anticorrosion stress-resistant performance by the conductivity value measurement result.During at present conductivity detects, need supporting corresponding reference block, and in testing process, by reference block conductivity instrument is demarcated, carry out actual detected by nominal data again.The testing process complexity, inefficiency.And, because the conductivity reference block in use can be worn and torn, preserve the improper corrosion that also can occur, owing to the aging characteristic of material, for same reference block, the result of each time calibrating is also incomplete same simultaneously, and the testing result reliability is not high.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, provide a kind of need not to detect before the implementation method of the conductivity measurement instrument demarcated of test block, after fixing according to the parameter of eddy detecting instrument and eddy current sensor, the eddy current testing signal phase place constant characteristic of metal material under same detection frequency, relevant mathematical model is set, the conductivity test of test block calibration before realizing need not to detect in instrument.
The technical solution adopted for the present invention to solve the technical problems is: a kind of need not to detect before the implementation method of the conductivity measurement instrument demarcated of test block, implementation method is,
A. under 20 ℃ of environment temperatures of standard, the detection frequency of calibrated eddy detecting instrument is set to a fixed frequency, the eddy current absolute sense signal initial phase of the standard conductivity test block of the known material conductivity of the various metals of employing standard eddy absolute sense probe measurement.Detecting frequency and obtain by impedance analysis, calculating and comparison test to tested nonferromugnetic material, is about 60kHz for conductivity in metal and the only detection frequency of alloy thereof of 1%IACS～100%IACS scope usually;
B. be that the conductivity values of the standard conductivity test block of horizontal ordinate, known material conductivity is ordinate with the eddy current absolute sense signal phase data of the standard conductivity test block of the known material conductivity measured, make phase place-conductivity relation curve, wherein, press linear process between 2, generate corresponding phase place-conductivity relation curvilinear function, this conductivity-phase relation curvilinear function model is kept in the eddy detecting instrument software;
C. integrated temperature survey sensor element in the eddy detecting instrument, and conductivity metal temperature compensation function model is kept in the eddy detecting instrument software, the conductivity metal value that the eddy detecting instrument under the actual measurement environment temperature is measured is modified to the conductivity metal value under 20 ℃ of environment temperatures of standard; Described conductivity metal temperature compensation function is
σ T=
σ 20[1+
α(T-20)], wherein:
σ TBe the conductivity metal value under the observed temperature,
σ 20Be the conductivity metal value under 20 ℃ of room temperatures of standard,
αBe the conductivity metal temperature compensation coefficient, T is the actual measurement ambient temperature value;
D. in the actual measurement process, when detecting a certain metal material conductivity, re-using the standard conductivity test block before need not to measure demarcates eddy detecting instrument, directly the detection faces with standard eddy absolute sense probe closely contacts with tested metal material surface, eddy detecting instrument is according to the phase value of the eddy current testing signal of the tested metal material of standard eddy absolute sense probe collection, by two built-in mathematical models of eddy detecting instrument, phase place-conductivity relation curvilinear function model and conductivity metal temperature compensation function model obtain the conductivity value under 20 ℃ of environment temperatures of standard of tested metal material.
The invention has the beneficial effects as follows, provide a kind of need not to detect before the implementation method of the conductivity measurement instrument demarcated of test block, after fixing according to the parameter of eddy detecting instrument and eddy current sensor, the eddy current testing signal phase place constant characteristic of metal material under same detection frequency, built-in phase place-conductivity relation curvilinear function model and conductivity metal temperature compensation function model in eddy detecting instrument, and in eddy detecting instrument integrated temperature survey sensor element, after this before measuring conductivity metal, re-use the standard conductivity test block before need not to survey eddy detecting instrument is demarcated, thereby improved the reliability of conductivity measurement efficient and testing result greatly.
Be described in further detail below in conjunction with the present invention of embodiment, but of the present invention a kind of need not to detect before the implementation method of the conductivity measurement instrument demarcated of test block be not limited to embodiment.
Embodiment
Embodiment, a kind of need not to detect before the implementation method of the conductivity measurement instrument demarcated of test block, implementation method is,
A. under 20 ℃ of environment temperatures of standard, the detection fixed-frequency of calibrated eddy detecting instrument is set to a fixed frequency, close the phase adjusting function of eddy detecting instrument, the eddy current absolute sense signal initial phase of the standard conductivity test block of the known material conductivity of the various metals of employing standard eddy absolute sense probe measurement;
B. be that the conductivity values of the standard conductivity test block of horizontal ordinate, known material conductivity is ordinate with the eddy current absolute sense signal phase data of the standard conductivity test block of the known material conductivity measured, make phase place-conductivity relation curve, wherein, press linear process between 2, generate corresponding phase place-conductivity relation curvilinear function, this conductivity-phase relation curvilinear function model is kept in the eddy detecting instrument software;
C. integrated temperature survey sensor element in the eddy detecting instrument, and conductivity metal temperature compensation function model is kept in the eddy detecting instrument software, the conductivity metal value that the eddy detecting instrument under the actual measurement environment temperature is measured is modified to the conductivity metal value under 20 ℃ of environment temperatures of standard; Described conductivity metal temperature compensation function is
σ T=
σ 20[1+
α(T-20)], wherein:
σ TBe the conductivity metal value under the observed temperature,
σ 20Be the conductivity metal value under 20 ℃ of room temperatures of standard,
αBe the conductivity metal temperature compensation coefficient, T is the actual measurement ambient temperature value;
D. in the actual measurement process, when detecting a certain metal material conductivity, re-using the standard conductivity test block before need not to measure demarcates eddy detecting instrument, directly the detection faces with standard eddy absolute sense probe closely contacts with tested metal material surface, eddy detecting instrument is according to the phase value of the eddy current testing signal of the tested metal material of standard eddy absolute sense probe collection, by two built-in mathematical models of eddy detecting instrument, phase place-conductivity relation curvilinear function model and conductivity metal temperature compensation function model obtain the conductivity value under 20 ℃ of environment temperatures of standard of tested metal material.
Above-described embodiment only be used for further specifying of the present invention a kind of need not to detect before the implementation method of the conductivity measurement instrument demarcated of test block; but invention is not limited to embodiment; every foundation technical spirit of the present invention all falls in the protection domain of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment does.
Claims (1)
- One kind need not to detect before the implementation method of the conductivity measurement instrument demarcated of test block, it is characterized in that: implementation method is,A. under 20 ℃ of environment temperatures of standard, the detection frequency of calibrated eddy detecting instrument is set to a fixed frequency, the eddy current absolute sense signal initial phase of the standard conductivity test block of the known material conductivity of the various metals of employing standard eddy absolute sense probe measurement;B. be that the conductivity values of the standard conductivity test block of horizontal ordinate, known material conductivity is ordinate with the eddy current absolute sense signal phase data of the standard conductivity test block of the known material conductivity measured, make phase place-conductivity relation curve, wherein, press linear process between 2, generate corresponding phase place-conductivity relation curvilinear function, this conductivity-phase relation curvilinear function model is kept in the eddy detecting instrument software;C. integrated temperature survey sensor element in the eddy detecting instrument, and conductivity metal temperature compensation function model is kept in the eddy detecting instrument software, the conductivity metal value that the eddy detecting instrument under the actual measurement environment temperature is measured is modified to the conductivity metal value under 20 ℃ of environment temperatures of standard; Described conductivity metal temperature compensation function is σ T= σ 20[1+ α(T-20)], wherein: σ TBe the conductivity metal value under the observed temperature, σ 20Be the conductivity metal value under 20 ℃ of room temperatures of standard, αBe the conductivity metal temperature compensation coefficient, T is the actual measurement ambient temperature value;D. in the actual measurement process, when detecting a certain metal material conductivity, re-using the standard conductivity test block before need not to measure demarcates eddy detecting instrument, directly the detection faces with standard eddy absolute sense probe closely contacts with tested metal material surface, eddy detecting instrument is according to the phase value of the eddy current testing signal of the tested metal material of standard eddy absolute sense probe collection, by two built-in mathematical models of eddy detecting instrument, phase place-conductivity relation curvilinear function model and conductivity metal temperature compensation function model obtain the conductivity value under 20 ℃ of environment temperatures of standard of tested metal material.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677888A (en) * | 2017-08-24 | 2018-02-09 | 中国矿业大学 | A kind of conductivity metal eddy current detection method |
| CN109625317A (en) * | 2018-11-29 | 2019-04-16 | 中国航发沈阳黎明航空发动机有限责任公司 | A kind of detecting instrument having aircraft and engine component eddy current inspection function concurrently |
| CN110763808A (en) * | 2019-11-13 | 2020-02-07 | 山东多瑞电子科技有限公司 | Factory calibration-free method for gas detector |
| CN111239199A (en) * | 2020-03-03 | 2020-06-05 | 宁波江丰电子材料股份有限公司 | Method for distinguishing high-purity aluminum from aluminum alloy |
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Patent Citations (4)
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| US4950990A (en) * | 1989-07-21 | 1990-08-21 | Iowa State University Research Foundation, Inc. | Method and apparatus for photoinductive imaging |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677888A (en) * | 2017-08-24 | 2018-02-09 | 中国矿业大学 | A kind of conductivity metal eddy current detection method |
| CN109625317A (en) * | 2018-11-29 | 2019-04-16 | 中国航发沈阳黎明航空发动机有限责任公司 | A kind of detecting instrument having aircraft and engine component eddy current inspection function concurrently |
| CN109625317B (en) * | 2018-11-29 | 2022-06-03 | 中国航发沈阳黎明航空发动机有限责任公司 | Detection instrument with eddy current inspection function of airplane and engine parts |
| CN110763808A (en) * | 2019-11-13 | 2020-02-07 | 山东多瑞电子科技有限公司 | Factory calibration-free method for gas detector |
| CN111239199A (en) * | 2020-03-03 | 2020-06-05 | 宁波江丰电子材料股份有限公司 | Method for distinguishing high-purity aluminum from aluminum alloy |
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Application publication date: 20130911 |