CN105842635A - Micro magnetic probe excitation feedback control method based on linear extrapolation - Google Patents

Micro magnetic probe excitation feedback control method based on linear extrapolation Download PDF

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Publication number
CN105842635A
CN105842635A CN201610162336.7A CN201610162336A CN105842635A CN 105842635 A CN105842635 A CN 105842635A CN 201610162336 A CN201610162336 A CN 201610162336A CN 105842635 A CN105842635 A CN 105842635A
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magnetic field
magnetic
hall
field intensity
excitation
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CN105842635B (en
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何存富
张秀
刘秀成
王磊
吴斌
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Beijing University of Technology
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Beijing University of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
    • G01R33/0041—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration using feed-back or modulation techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
    • G01R33/14—Measuring or plotting hysteresis curves

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

The invention discloses a micro magnetic probe excitation feedback control method based on linear extrapolation, including three parts: an excitation magnetic circuit, a magnetic field measurement module and a feedback control module; a Hall member linear array on the inner side of the U-shaped excitation magnetic circuit adopts three Hall members (Hall 1, Hall 2, and Hall 3) of three identical models which are arranged along the direction perpendicular to a detected material or the direction of the structure surface in order to measure intensities of tangential magnetic fields of three height positions, and the intensities of the tangent magnetic fields are recorded as H1, H2 and H3. After a magnetic field adjustment structure is placed on the inner side of the U type excitation magnetic circuit, the gradient of the magnetic field intensity is reduced and the linearity change range is extended from ZL to ZH. A feedback control module consisting of a data collection card, an arbitrary signal excitation card and control software enables two paths of signals of an magnetic induction intensity B and a surface tangent magnetic field intensity H to satisfy the requirement set by the control variable through iteration feedback and improves the accuracy of the measurement on a saturation hysteresis curve hysteresis curve by the open loop magnetic circuit.

Description

Micro-magnetic probe excitation feedback based on linear extrapolation
Technical field
Micro-magnetic probe excitation feedback based on linear extrapolation belongs to micro-magnetic field of non destructive testing, uses The tangential magnetic field intensity of component surface is accurately detected by linear extrapolation method, by magnetic circuit feedback control mould Block, makes magnetic induction and surface tangential magnetic field intensity two paths of signals meet the requirement set by control variable, Promote the accurate measurement to saturation hysteresis loop of the open loop magnetic path test system.
Background technology
The measurement of hysteresis curve B-H is one of main method of analysis of material magnetic characteristic.Utilize hysteresis curve, Multiple magnetics parameter can be extracted, such as coercivity Hc, remanent magnetism BrAnd iron loss P etc..Closed loop hysteresis curve is surveyed Though metering method precision is high but being difficult to commercial Application, existing open loop magnetic path test system there is also deficiency: one Aspect, the surface of test piece tangential magnetic field intensity drawn exists bigger with actual value to use excitation coil electric current to calculate Error；On the other hand, when measuring the lift-off distance fluctuation of magnetic circuit and tested component, the magnetic hysteresis that test draws is returned There is larger difference in line, makes the precision of test system be affected by lift-off distance, does not have and changes test condition Adaptability.
For improving the problems referred to above, set forth herein a kind of micro-magnetic probe excitation feedback control side based on linear extrapolation Method, to promote the open loop magnetic circuit test systematic function of hysteresis curve, obtains the accurate saturated magnetic of material or structure Hysteresis curves.
Summary of the invention
The purpose of the present invention is to propose to micro-magnetic probe excitation feedback based on linear extrapolation, such as accompanying drawing 1 Shown in, summary of the invention is divided into three parts: Part I is magnetic excitation circuit, adjusts including excitation coil 1, magnetic field Structure 2, U-shaped yoke 3, excitation coil 1 is wrapped on U-shaped yoke 3, and magnetic field adjusts structure 2 and is arranged on The centre of U-shaped yoke 3, excitation coil 1, magnetic field adjust structure 2, U-shaped yoke 3 and measured material or knot Structure 5 forms connection magnetic circuit；Part II is magnetic-field measurement module, including Hall element linear array 4 and the line of induction Circle 6；Part III is feedback control module 7.
Hall element linear array 4 inside U-shaped magnetic excitation circuit, uses the Hall element Hall of three same model1、 Hall2、Hall3Along being perpendicular in measured material or structure 5 surface direction layout, to measure three height and positions Tangential magnetic field intensity, be designated as H respectively1、H2、H3.As shown in Figure 2, in Hall element linear array 4 institute In the range of place, tangential magnetic field intensity HxIt is distributed along vertical dimension Z-direction approximately linear, utilizes three Hall units Tangential magnetic field intensity H that part measurement obtainsxAnd their position coordinates Z, matching obtain tangential magnetic field intensity with Linear equation H between vertical height coordinatex=f (Z), wherein the span of Z is [0, ZL] or [0, ZH], utilize line Property extrapolation method calculate material or structure 5 surface (Z=0) tangential magnetic field intensity Hx accurately；For improving line The property extrapolation certainty of measurement to surface tangential magnetic field intensity, this method devises to reduce and is vertically measured and monitored the growth of standing timber The magnetic field of the tangential magnetic field intensity gradient in material or body structure surface direction adjusts structure 2.As shown in Figure 3, at U After placing adjustment structure 2 in magnetic field inside type magnetic excitation circuit, tangential magnetic field intensity gradient reduces and linear change model Enclose expansion, from ZLBring up to ZH。
After the integrated conversion of output voltage of the induction coil 6 being around in measured material or structure 5, obtain magnetic Induction B, for realizing the accurate test of saturation hysteresis loop, with magnetic induction maximum BmaxAnd table Face tangential magnetic field intensity peak value difference δ HmaxFor control variable, use by data collecting card, arbitrary signal excitation plate Card and the feedback control module 7 controlling software composition based on LabVIEW platform, by iterative feedback, make Magnetic induction density B and surface tangential magnetic field intensity H two paths of signals meet the requirement set by control variable, carry Rise the accurate measurement to saturation hysteresis loop of the open loop magnetic path test system.
As shown in Figure 3, the feedback control of feedback control module 7 is carried out the most in two steps:
The first step, adjusts driving voltage VExcitationT () controls magnetic induction amplitude Bmax and reaches required value, tool Body iterative formula is as follows:
In formula, i is iterations
During the i-th rank iteration, between requirement maximum amplitude and the true amplitude of controlled magnetic induction density B Difference, its expression formula isFor the maximum amplitude required, for i & lt Real amplitude during iteration
kBmaxCorrection factor, describes the driving voltage amplitude rate of change relative to controlled magnetic induction amplitude, Expression formula is kBmax=δ Vmax/δBmax
The maximum amplitude of driving voltage during ith iteration
Bias voltage during ith iteration
Loop termination condition is ith iterationValue meetsWherein m is basis The constant that specific requirement is manually set, is often 0～10%, depending on concrete error.
Second step, regulates symmetry, the half of the difference of the absolute value of the positive and negative maximum amplitude of tangential magnetic field | δ Hmax/2| It is to judge parameter, if not its value zero, is iterated regulation and makes until i & lt is satisfied Wherein n is the constant being manually set according to specific requirement, is often 0～10%, depending on concrete error.
Meeting after requiring, feedback control regulation terminates.
The present invention uses above technical scheme, it is possible to obtain following beneficial effect: accurate evaluation material or structure The tangential magnetic field intensity on surface, by magnetic circuit feedback control module, makes magnetic induction and surface tangential magnetic field Intensity two paths of signals meets the requirement set by control variable, improves open loop magnetic path test system to saturated magnetic The certainty of measurement of hysteresis curves.
Accompanying drawing explanation
The open loop magnetic circuit test system schematic of Fig. 1 hysteresis curve.
Fig. 2 has, without the tangential magnetic field intensity distributions schematic diagram inside U-shaped magnetic circuit during the adjustment structure of magnetic field.
The feedback control flow process figure of Fig. 3 hysteresis curve test.
Detailed description of the invention
With embodiment and accompanying drawing 1-3, the invention will be further described below, and following example are descriptive , it is impossible to limit protection scope of the present invention with this.
Excitation coil and induction coil are tightly wound around on U-shaped ferrum and measured material surface respectively, U-shaped Optimize magnetic circult structure inside magnetic excitation circuit is placed Hall element linear array, by the modern times identical for three models suddenly You are element Hall1、Hall2、Hall3Along being perpendicular on the direction of tested component placement, its coordinate is respectively Z1、 Z2、Z3, record the magnetic field intensity near tested component and be respectively H1、H2、H3.Linear fit is used to obtain directly Line equation Hx=f (Z), then tangential magnetic field H of tested component surface (Z=0) is obtained with equation linear extrapolationx。
After the integrated conversion of output voltage of the induction coil being around in measured material or structure, obtain magnetic induction strong Degree B, utilizes the feedback control flow process figure that accompanying drawing 3 is announced, tangential to magnetic induction density B and surface successively Magnetic field intensity H two paths of signals is adjusted so that it is meet requirement set in advance.

Claims (2)

1. micro-magnetic probe excitation feedback based on linear extrapolation, it is characterised in that: realize the method Content be divided into three parts: Part I is magnetic excitation circuit, including excitation coil (1), magnetic field adjust structure (2), U-shaped yoke (3), excitation coil (1) is wrapped on U-shaped yoke (3), and magnetic field adjusts structure (2) and sets Putting the centre in U-shaped yoke (3), excitation coil (1), magnetic field adjust structure (2), U-shaped yoke (3) Formed with measured material or structure (5) and connect magnetic circuit；Part II is magnetic-field measurement module, including Hall unit Part linear array (4) and induction coil (6)；Part III is feedback control module (7)；
Hall element linear array (4) inside U-shaped magnetic excitation circuit, uses the Hall element of three same model Hall1、Hall2、Hall3Along being perpendicular in measured material or structure (5) surface direction layout, to measure three The tangential magnetic field intensity of height and position, is designated as H respectively1、H2、H3；At model residing for Hall element linear array (4) In enclosing, tangential magnetic field intensity HxIt is distributed along vertical dimension Z-direction approximately linear, utilizes three Hall elements to survey Tangential magnetic field intensity H measuredxAnd their position coordinates Z, matching obtains tangential magnetic field intensity with vertical Linear equation H between height coordinatex=f (Z), wherein the span of Z is [0, ZL] or [0, ZH], outside utilizing linearly The method pushed away calculates material or structure (5) surface (Z=0) tangential magnetic field intensity H accuratelyx；For improving line The property extrapolation certainty of measurement to surface tangential magnetic field intensity, this method devises and can reduce vertical measured material Or the magnetic field of the tangential magnetic field intensity gradient in body structure surface direction adjusts structure (2)；In U-shaped magnetic excitation circuit After placement magnetic field, side adjusts structure (2), tangential magnetic field intensity gradient reduces and range of linearity expands, from ZLBring up to ZH；
After the integrated conversion of output voltage of the induction coil (6) being around in measured material or structure (5), To magnetic induction density B, for realizing the accurate test of saturation hysteresis loop, with magnetic induction maximum Bmax And surface tangential magnetic field intensity peak value difference δ HmaxFor control variable, use and swashed by data collecting card, arbitrary signal Encourage board and the feedback control module (7) controlling software composition based on LabVIEW platform, anti-by iteration Feedback, makes magnetic induction density B and surface tangential magnetic field intensity H two paths of signals meet wanting set by control variable Ask, promote the accurate measurement to saturation hysteresis loop of the open loop magnetic path test system.
Micro-magnetic probe excitation feedback based on linear extrapolation the most according to claim 1, its It is characterised by: the feedback control of feedback control module (7) is carried out the most in two steps,
The first step, adjusts driving voltage VExcitationT () controls magnetic induction amplitude BmaxReach required value, tool Body iterative formula is as follows:
In formula, i is iterations
During the i-th rank iteration, between requirement maximum amplitude and the true amplitude of controlled magnetic induction density B Difference, its expression formula isFor the maximum amplitude required, for i & lt Real amplitude during iteration
kBmaxCorrection factor, describes the driving voltage amplitude rate of change relative to controlled magnetic induction amplitude, Expression formula is kBmax=δ Vmax/δBmax
The maximum amplitude of driving voltage during ith iteration
Bias voltage during ith iteration
Loop termination condition is ith iterationValue meets(wherein m is basis The constant that specific requirement is manually set, is often 0～10%, depending on concrete error)；
Second step, regulates symmetry, the half of the difference of the absolute value of the positive and negative maximum amplitude of tangential magnetic field | δ Hmax/2 It is to judge parameter, if not its value zero, is iterated regulation and makes until i & lt is satisfied Wherein n is the constant being manually set according to specific requirement, is often 0～10%；
Meeting after requiring, feedback control regulation terminates.
CN201610162336.7A 2016-03-21 2016-03-21 Micro- magnetic probe excitation feedback based on linear extrapolation Active CN105842635B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107240474A (en) * 2017-07-28 2017-10-10 胡明建 A kind of design method being focused with superconductor to the superconductor coil magnetic line of force
CN108957368A (en) * 2018-03-27 2018-12-07 中国电力科学研究院有限公司 A kind of system and method measuring magnetic characteristic under silicon steel material D.C. magnetic biasing state
CN111157609A (en) * 2019-12-31 2020-05-15 钢研纳克检测技术股份有限公司 Surface tangential magnetic field high-precision measurement system and method based on orthogonal analysis
CN113705050A (en) * 2021-08-26 2021-11-26 哈尔滨工程大学 Virtual experimental platform for superconducting quantum interferometer teaching
CN114467010A (en) * 2019-10-16 2022-05-10 ams有限公司 Sensor front-end and method for operating a sensor device

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GB2269497A (en) * 1992-08-05 1994-02-09 Yang Tai Her DC electric motor control arrangement
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CN103635798A (en) * 2011-04-27 2014-03-12 曼彻斯特大学 Electromagnetic sensor and calibration therefor
CN103645243A (en) * 2013-11-28 2014-03-19 南京航空航天大学 Electromagnetic nondestructive detection system of power transmission line
CN104335061A (en) * 2012-06-08 2015-02-04 株式会社藤仓 Magnetic element control device, magnetic element control method and magnetic detection device

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US3609530A (en) * 1968-03-13 1971-09-28 Atomic Energy Authority Uk Magnetic leakage field flaw detector with compensation for variation in spacing between magnetizer and test piece
GB2269497A (en) * 1992-08-05 1994-02-09 Yang Tai Her DC electric motor control arrangement
CN1584621A (en) * 2004-05-28 2005-02-23 清华大学 Horizontal magnetic coupler mechanical loading and measuring systems
CN101858963A (en) * 2009-04-08 2010-10-13 常州信息职业技术学院 Method for measuring static magnetic characteristic
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CN104335061A (en) * 2012-06-08 2015-02-04 株式会社藤仓 Magnetic element control device, magnetic element control method and magnetic detection device
CN103645243A (en) * 2013-11-28 2014-03-19 南京航空航天大学 Electromagnetic nondestructive detection system of power transmission line

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107240474A (en) * 2017-07-28 2017-10-10 胡明建 A kind of design method being focused with superconductor to the superconductor coil magnetic line of force
CN108957368A (en) * 2018-03-27 2018-12-07 中国电力科学研究院有限公司 A kind of system and method measuring magnetic characteristic under silicon steel material D.C. magnetic biasing state
CN114467010A (en) * 2019-10-16 2022-05-10 ams有限公司 Sensor front-end and method for operating a sensor device
CN111157609A (en) * 2019-12-31 2020-05-15 钢研纳克检测技术股份有限公司 Surface tangential magnetic field high-precision measurement system and method based on orthogonal analysis
CN113705050A (en) * 2021-08-26 2021-11-26 哈尔滨工程大学 Virtual experimental platform for superconducting quantum interferometer teaching
CN113705050B (en) * 2021-08-26 2023-10-27 哈尔滨工程大学 Teaching virtual experiment platform for superconducting quantum interferometer

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