CN101813534A - Method and device for continuously measuring stress of ferromagnetic material in contact-less mode - Google Patents
Method and device for continuously measuring stress of ferromagnetic material in contact-less mode Download PDFInfo
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- CN101813534A CN101813534A CN200910006498A CN200910006498A CN101813534A CN 101813534 A CN101813534 A CN 101813534A CN 200910006498 A CN200910006498 A CN 200910006498A CN 200910006498 A CN200910006498 A CN 200910006498A CN 101813534 A CN101813534 A CN 101813534A
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Abstract
The invention relates to a method and a device for continuously measuring stress of a ferromagnetic material in a contact-less mode. The method comprises the following steps of: generating magnetic fields in isolated coils through current to magnetize a measured object; feeding an alternating current (AC) with attenuated amplitude into an excitation coil, and then feeding a direct current (DC) into the excitation coil, wherein an induction coil outputs a voltage signal related to the stress of a measured material when the alternating current is fed into the excitation coil. The measuring device comprises an impulse current generator of which the amplitude is attenuated over time, a direct-current power supply, an alternating current generator with constant amplitude, a compensator and a voltage signal processor. The method and the device have the advantages of continuously monitoring changes of the stress of the ferromagnetic material, realizing online stress measurements of various iron and steel products such as performing contact-less continuous measurements on steel cable loads of suspension bridges, dynamic loads of steel cables of hoisting equipment, internal stress of steel bars and the like, and providing necessary safety monitoring for traffic facilities, engineering machinery and building structures.
Description
Technical field the invention belongs to detection technique, is specifically related to a kind of method and apparatus with noncontact mode continuously measuring stress of ferromagnetic material.
Background technology is at present with the method for noncontact mode continuously measuring stress of ferromagnetic material, be on the measured material surface, to place a resonance coil that constitutes by inductance and electric capacity, by with the discontiguous coupled circuit of measurand, survey because the measurand magnetoconductivity that stress causes changes the coil resonance frequency change that causes, thereby obtain measurand and descend stress continually varying information in working order, typical scenario such as TYREN, Carl, H. Fa Ming patented technology WO 91/00494, PCT/SE 90/0044.
The weak point of this scheme is that the eddy current that measurand produces exerts an influence to resonance frequency.In addition, different spatial ferromagnetic material magnetoconductivity changes coil resonance frequency influence difference, and is very complicated by the process of frequency inversion stress.
Summary of the invention the purpose of this invention is to provide a kind of new method and apparatus, with the stress of noncontact mode continuous coverage ferromagnetic material inside.Utilize the present invention, can obtain stress continually varying information, realize the measurement of stress online in real time.
Method of the present invention is, adopt magnetizing coil (1), inductive coil (2), drive coil (3) and the compensating coil (4) of isolating mutually, be reduced to zero exchange current to magnetizing coil (1) feed-in amplitude gradually by maximum value, after this to its feed-in DC current, and to drive coil (3) feed-in exchange current, to coil (4) feed-in offset current, the output continuous signal relevant in inductive coil (2) two ends with tested ferromagnetic material stress.
Realization the inventive system comprises magnetizing coil (1), inductive coil (2), drive coil (3) and the compensating coil (4) of mutual isolation, the generation amplitude is reduced to zero exchange current pulse producer gradually by maximum value, produce the direct supply of bias current, produce the alternating current generator of pumping signal, the compensation voltage signal generator of compensation bias current random variation, and inductive signal processing unit.
Technical scheme of the present invention is compared with the prior art scheme, and its beneficial effect is to obtain stress continually varying information.According to the present invention, can make the non-contact magnetically stress detection device that is used for multiple object, realize the stress continuous monitoring, find stress loading moment sudden change, for bridge, building structure, power system and hoisting device safe operation provide necessary monitoring technology means.
Description of drawings
Fig. 1 illustrates the current waveform that passes through magnetizing coil that the present invention adopts
Fig. 2 illustrates the current waveform by drive coil
Fig. 3 illustrates measurement mechanism circuit block diagram of the present invention
Fig. 4 illustrates the compensator circuit block diagram that links to each other with compensating coil
Fig. 5 illustrates inductive coil output voltage signal detector circuit block diagram
Embodiment
Below in conjunction with drawings and Examples method and apparatus of the present invention is described in detail.
Decay to zero alternating impulse electric current and follow-up DC current gradually to magnetizing coil (1) feed-in amplitude in the measuring process, as shown in Figure 1, to the constant exchange current of drive coil (3) feed-in amplitude, (horizontal ordinate T express time among Fig. 1 and Fig. 2 as shown in Figure 2, ordinate I represents the electric current of feed-in), to compensating coil (4) feed-in compensation voltage signal, obtain the voltage signal relevant with measured material stress from inductive coil (2) two ends.The amplitude of feed in winding (1) decays to zero alternating impulse electric current frequency gradually between 0.1 to 10000HZ, maximum amplitude is between 0.01～1A, amplitude decays to the zero duration between 0.1～200 second by maximal value, the DC current amplitude of follow-up feed in winding (1) is between 0.001～2A, the exchange current amplitude of feed-in drive coil (3) is between 0.001～2A, and frequency is between 0.1～10000HZ.
Measurement mechanism comprise mutual isolation magnetizing coil (1), inductive coil (2), drive coil (3) and and compensating coil (4), amplitude be reduced to zero exchange current pulse producer (5), direct supply (6), voltage signal treating apparatus (7), alternating current generator (8) and compensating signal generator (9) gradually, as shown in Figure 3.Compensating signal generator (9) is made of sample resistance (10), reference voltage source (11), differential amplifier (12) and power amplifier (13), and the output terminal of power amplifier (13) links to each other with compensating coil (4), as shown in Figure 4.What inductive coil (2) was exported comprises wave detector (14) and wave filter (15) with measured material stress associated voltage Signal Processing device (7), as shown in Figure 5.
Claims (6)
1. method with noncontact mode continuously measuring stress of ferromagnetic material, use the magnetizing coil (1) and the inductive coil (2) of isolating mutually, make tested ferromagnetic material magnetization to magnetizing coil feed-in exciting curent, it is characterized in that, also use drive coil (3) and compensating coil (4), be reduced to zero exchange current to magnetizing coil (1) feed-in amplitude gradually by maximum value, after this to its feed-in DC current, and to drive coil (3) feed-in exchange current, to coil (4) feed-in offset current, the output continuous signal relevant in inductive coil (2) two ends with tested ferromagnetic material stress.
2. a kind of method according to claim 1 with noncontact mode continuously measuring stress of ferromagnetic material, it is characterized in that, the amplitude of feed-in magnetizing coil (1) decays to zero alternating impulse electric current frequency gradually between 0.1 to 10000HZ, maximum amplitude is between 0.01～1A, amplitude decays to the zero duration between 0.1～200 second by maximal value, and the DC current amplitude of follow-up feed-in is between 0.001～2A.
3. according to the described a kind of method with noncontact mode continuously measuring stress of ferromagnetic material of claim 1, it is characterized in that the exchange current amplitude of feed-in drive coil (3) is between 0.001～2A, frequency is between 0.1～10000HZ.
4. device with noncontact mode continuously measuring stress of ferromagnetic material, the magnetizing coil (1) and the inductive coil (2) that comprise mutual isolation, it is characterized in that, comprise that also drive coil (3), compensating coil (4), output current amplitude are reduced to zero alternating impulse current feedback circuit (5), direct supply (6), voltage signal treating apparatus (7), alternating current generator (8) and compensating signal generator (9) gradually by maximum value.
5. a kind of device according to claim 4 with noncontact mode continuously measuring stress of ferromagnetic material, it is characterized in that, compensating signal generator (9) is made of sample resistance (10), reference voltage source (11), differential amplifier (12) and power amplifier (13), and the output terminal of power amplifier (13) links to each other with compensating coil (4).
6. a kind of device according to claim 4 with noncontact mode continuously measuring stress of ferromagnetic material, it is characterized in that what inductive coil (2) was exported comprises wave detector (14) and wave filter (15) with measured material stress associated voltage Signal Processing device (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100064981A CN101813534B (en) | 2009-02-19 | 2009-02-19 | Method and device for continuously measuring stress of ferromagnetic material in contact-less mode |
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| CN2009100064981A CN101813534B (en) | 2009-02-19 | 2009-02-19 | Method and device for continuously measuring stress of ferromagnetic material in contact-less mode |
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| CN101813534A true CN101813534A (en) | 2010-08-25 |
| CN101813534B CN101813534B (en) | 2012-06-27 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013078981A1 (en) * | 2011-11-30 | 2013-06-06 | 浙江大学 | Stress monitoring device of magneto-elastic and magneto-electric effect type |
| CN103728060A (en) * | 2013-12-17 | 2014-04-16 | 柳州市自动化科学研究所 | Steel cable prestress magnetic flux impulse measurement method |
| CN103728059A (en) * | 2013-12-17 | 2014-04-16 | 柳州市自动化科学研究所 | Steel cable prestress value magnetic flux control system |
| CN103808453A (en) * | 2014-02-08 | 2014-05-21 | 安徽工程大学 | Electromagnetic vibration exciter with amplitude self-stabilization sine wave exciting force within operation bandwidth |
| CN106197764A (en) * | 2016-07-11 | 2016-12-07 | 南昌大学 | A kind of method of testing of iron-based amorphous alloy ribbon material piezomagnetism |
| CN110187183A (en) * | 2019-05-24 | 2019-08-30 | 太原理工大学 | Contactless original state Polluted Soil resistivity measurement device and method |
| CN111089664A (en) * | 2018-10-24 | 2020-05-01 | 华中科技大学 | Self-powered flexible pressure sensor and preparation method thereof |
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| CN107576425A (en) * | 2017-08-25 | 2018-01-12 | 北京科技大学 | A kind of device and method of non-contact measurement ferromagnetic material stress |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370238C (en) * | 2005-07-18 | 2008-02-20 | 吉林大学 | Apparatus for measuring internal stress of ferromagnetic material |
| CN101216460B (en) * | 2008-01-11 | 2011-01-26 | 清华大学 | AC and DC composite magnetisation based leakage detection recognition method for inside and outside wall defect |
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2009
- 2009-02-19 CN CN2009100064981A patent/CN101813534B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013078981A1 (en) * | 2011-11-30 | 2013-06-06 | 浙江大学 | Stress monitoring device of magneto-elastic and magneto-electric effect type |
| EP2787336A4 (en) * | 2011-11-30 | 2015-09-02 | Univ Zhejiang | Stress monitoring device of magneto-elastic and magneto-electric effect type |
| CN103728060A (en) * | 2013-12-17 | 2014-04-16 | 柳州市自动化科学研究所 | Steel cable prestress magnetic flux impulse measurement method |
| CN103728059A (en) * | 2013-12-17 | 2014-04-16 | 柳州市自动化科学研究所 | Steel cable prestress value magnetic flux control system |
| CN103808453A (en) * | 2014-02-08 | 2014-05-21 | 安徽工程大学 | Electromagnetic vibration exciter with amplitude self-stabilization sine wave exciting force within operation bandwidth |
| CN106197764A (en) * | 2016-07-11 | 2016-12-07 | 南昌大学 | A kind of method of testing of iron-based amorphous alloy ribbon material piezomagnetism |
| CN111089664A (en) * | 2018-10-24 | 2020-05-01 | 华中科技大学 | Self-powered flexible pressure sensor and preparation method thereof |
| CN111089664B (en) * | 2018-10-24 | 2020-12-29 | 华中科技大学 | Self-powered flexible pressure sensor and preparation method thereof |
| CN110187183A (en) * | 2019-05-24 | 2019-08-30 | 太原理工大学 | Contactless original state Polluted Soil resistivity measurement device and method |
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| Publication number | Publication date |
|---|---|
| CN101813534B (en) | 2012-06-27 |
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Effective date of registration: 20200309 Address after: 311106 building B2, Qidi Wanhua science and Technology Park, No. 511, Xingzhong Road, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Automation Technology Research Institute Sensing Technology Co., Ltd. Address before: 310012 No. 48 Huang Shan Road, Zhejiang, Hangzhou Patentee before: Hangzhou Automation Technology Research Institute Co., Ltd. |