CN104049031A - Subsurface defect detection device and method based on alternative current electromagnetic field - Google Patents
Subsurface defect detection device and method based on alternative current electromagnetic field Download PDFInfo
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- CN104049031A CN104049031A CN201410261624.9A CN201410261624A CN104049031A CN 104049031 A CN104049031 A CN 104049031A CN 201410261624 A CN201410261624 A CN 201410261624A CN 104049031 A CN104049031 A CN 104049031A
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Abstract
The invention discloses a subsurface defect detection device and method based on an alternative current electromagnetic field. The subsurface defect detection device comprises an excitation coil, a magnetic core, a detection coil, a signal adjuster, an A/D (Analog-to-Digital) acquisition card, a computer, a power supply, a pulse signal exciter and a power amplifier. Compared with the prior art, the subsurface defect detection device generates a periodic pulse signal through a pulse signal generator, the periodic pulse signal is applied to an excitation probe, then an alternating pulse magnetic field is sensed on the subsurface and the deep layer of a workpiece, filtering and denoising are continued by a signal modulation circuit, the data acquisition card based on a USB (Universal Serial Bus) is adopted for acquisition, an instantaneous signal analysis method is adopted to draw sensation voltage signal peak value waveforms in the BX direction and the BZ direction, and thus intelligent recognition and quantification on subsurface defects and deep layer defects are achieved. By virtue of the subsurface defect detection device and method, the defects of a deep layer defect alternative current electromagnetic field detection technique are effectively made up, and a completely novel method is provided for high-sensitivity comprehensive rapid quantitative recognition on subsurface detects and deep layer detects of a structural body, and the essential safety level of a facility structure is improved.
Description
Technical field
The present invention relates to a kind of electromagnetic nondestructive method, relate in particular to a kind of subsurface defect pick-up unit and detection method based on ac magnetic field.
Background technology
It is a kind of non-contact electromagnetic Dynamic Non-Destruction Measurement that ac magnetic field detects (ACFM), because it has non-contact detecting, mathematical model is clear and definite, quantitatively accuracy of identification is high, detection speed is fast, to probe lift from the distinct advantages such as motion-insensitive, be widely used in the fields such as civil engineering work, petrochemical complex, electric power and nuclear industry.But, owing to mostly encouraging with the single frequency sinusoidal ac signal about 6000Hz in ACFM technical know-how at present, due to kelvin effect, induction current concentrates on surface of the work, the induction field depth of penetration is more shallow, cannot realize the detection of non-surface imperfection in workpiece, generally be only applicable to the detection of surface imperfection, cause existing ACFM technology and equipment can not meet the complete detection demand of the dissimilar deep zone defect of device structure thing, greatly reduce practicality and the detection efficiency of ac magnetic field detection technique, development and the in-depth of this technology have been limited to a great extent, how to improve ACFM detection technique the detection sensitivity concealing defects of the sub-surface of works and deep layer is seemed to very important.
Summary of the invention
Object of the present invention provides a kind of subsurface defect pick-up unit and detection method based on ac magnetic field with regard to being in order to address the above problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of subsurface defect pick-up unit based on ac magnetic field, comprise drive coil, magnetic core, magnetic test coil, signal conditioner, A/D capture card, computing machine, power supply, pulse signal driver and power amplifier, described magnetic test coil is positioned at the below at described magnetic core middle part and presses close to the workpiece, defect place of workpiece, the signal output part of described magnetic test coil is connected with described computing machine with described A/D capture card by described signal conditioner successively, described power supply is connected with described pulse signal driver with described signal conditioner simultaneously, the signal output part of described pulse signal driver is connected with described drive coil by described power amplifier, described drive coil is positioned at the stage casing of described magnetic core.
Particularly, described signal conditioner is comprised of prime amplifier AD620 and Butterworth filter, and A/D capture card is a kind of data collecting card based on usb bus.
A subsurface defect detection method based on ac magnetic field, comprises the following steps:
(1) pulse signal generator produces the cyclic pulse signal of certain frequency and amplitude;
(2) magnetic core that employing material is manganese-zinc ferrite is as the skeleton of incentive probe, and thereon the coil of the certain number of turn of coiling as drive coil, the two forms incentive probe, is provided for extracting the magnetic test coil of workpiece distortion signal in the indentation, there of magnetic core simultaneously;
(3) pulse signal step (1) being produced, is loaded into the incentive probe in step (2) through power amplifier, according to the kelvin effect of alternating current, on the sub-surface of workpiece and deep layer place induce the pulsed magnetic field of alternation;
(4) utilize detection probe in step (2) to extract the distorted signal of surface of the work X and Z direction, then input signal conditioning circuit carries out signal filtering and de-noising, then through data collecting card, collects computing machine and carry out signal processing and demonstration;
(5) according to the defect characteristic signal of computer acquisition, utilize transient signal analytical approach, extract the peak value that BX and the BZ induced voltage signal of detection probe in each position of surface of the work distributes, draw out along the BX of test path direction and the peak value squiggle of BZ, realize Intelligent Recognition and quantification to the sub-surface of workpiece and deep zone defect.
Further, the detection probe of described step (2) is mainly comprised of BX magnetic test coil and the BZ magnetic test coil of quadrature, is respectively used to extract induced voltage signal in the distortion value of X and Z direction.
Beneficial effect of the present invention is:
The present invention is a kind of subsurface defect pick-up unit and detection method based on ac magnetic field, compared with prior art, the present invention produces cyclic pulse signal by pulse signal generator, be carried on incentive probe, thereby on the sub-surface of workpiece and deep layer place induce the pulsed magnetic field of alternation, by signal conditioning circuit, continue filtering and denoising, the data collecting card collection of utilization based on usb bus, adopt transient signal analytical approach to draw out the induced voltage signal peak value waveform of BX and BZ direction, realize Intelligent Recognition and the quantification of subsurface defect and deep zone defect.The present invention effectively makes up the deficiency of deep zone defect ac magnetic field detection technique, for the sub-surface of structure and the comprehensive fast quantification identification of deep zone defect high sensitivity provide a kind of brand-new method, improves the essential safety level of equipment configuration.
Accompanying drawing explanation
Fig. 1 is the structural representation of subsurface defect pick-up unit of the present invention.
In figure: 1-drive coil, 2-magnetic core, 3-magnetic test coil, 4-workpiece, 5-workpiece, defect place.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1: a kind of subsurface defect pick-up unit based on ac magnetic field, comprise drive coil 1, magnetic core 2, magnetic test coil 3, signal conditioner, A/D capture card, computing machine, power supply, pulse signal driver and power amplifier, the workpiece, defect place 5 of workpiece 4 is also pressed close in the below at 3 magnetic core 2 middle parts of magnetic test coil, the signal output part of magnetic test coil 3 is connected with computing machine with A/D capture card by signal conditioner successively, power supply is connected with pulse signal driver with signal conditioner simultaneously, the signal output part of pulse signal driver is connected with drive coil 1 by power amplifier, drive coil 1 is positioned at the stage casing of magnetic core 2, signal conditioner is comprised of prime amplifier AD620 and Butterworth filter, A/D capture card is a kind of data collecting card based on usb bus.
As shown in Figure 1: a kind of subsurface defect detection method based on ac magnetic field, comprises the following steps:
(1) pulse signal generator produces the cyclic pulse signal of certain frequency and amplitude;
(2) magnetic core that employing material is manganese-zinc ferrite is as the skeleton of incentive probe, and thereon the coil of the certain number of turn of coiling as drive coil, the two forms incentive probe, is provided for extracting the magnetic test coil of workpiece distortion signal in the indentation, there of magnetic core simultaneously;
(3) pulse signal step (1) being produced, is loaded into the incentive probe in step (2) through power amplifier, according to the kelvin effect of alternating current, on the sub-surface of workpiece and deep layer place induce the pulsed magnetic field of alternation;
(4) utilize detection probe in step (2) to extract the distorted signal of surface of the work X and Z direction, then input signal conditioning circuit carries out signal filtering and de-noising, then through data collecting card, collects computing machine and carry out signal processing and demonstration;
(5) according to the defect characteristic signal of computer acquisition, utilize transient signal analytical approach, extract the peak value that BX and the BZ induced voltage signal of detection probe in each position of surface of the work distributes, draw out along the BX of test path direction and the peak value squiggle of BZ, Intelligent Recognition and the quantification of realization to the sub-surface of workpiece and deep zone defect, the detection probe of described step (2) is mainly comprised of BX magnetic test coil and the BZ magnetic test coil of quadrature, is respectively used to extract induced voltage signal in the distortion value of X and Z direction.
Claims (4)
1. the subsurface defect pick-up unit based on ac magnetic field, it is characterized in that: comprise drive coil, magnetic core, magnetic test coil, signal conditioner, A/D capture card, computing machine, power supply, pulse signal driver and power amplifier, described magnetic test coil is positioned at the below at described magnetic core middle part and presses close to the workpiece, defect place of workpiece, the signal output part of described magnetic test coil is connected with described computing machine with described A/D capture card by described signal conditioner successively, described power supply is connected with described pulse signal driver with described signal conditioner simultaneously, the signal output part of described pulse signal driver is connected with described drive coil by described power amplifier, described drive coil is positioned at the stage casing of described magnetic core.
2. the subsurface defect pick-up unit based on ac magnetic field according to claim 1, it is characterized in that: described signal conditioner is comprised of prime amplifier AD620 and Butterworth filter, A/D capture card is a kind of data collecting card based on usb bus.
3. the subsurface defect detection method based on ac magnetic field, is characterized in that, comprises the following steps:
(1) pulse signal generator produces the cyclic pulse signal of certain frequency and amplitude;
(2) magnetic core that employing material is manganese-zinc ferrite is as the skeleton of incentive probe, and thereon the coil of the certain number of turn of coiling as drive coil, the two forms incentive probe, is provided for extracting the magnetic test coil of workpiece distortion signal in the indentation, there of magnetic core simultaneously;
(3) pulse signal step (1) being produced, is loaded into the incentive probe in step (2) through power amplifier, according to the kelvin effect of alternating current, on the sub-surface of workpiece and deep layer place induce the pulsed magnetic field of alternation;
(4) utilize detection probe in step (2) to extract the distorted signal of surface of the work X and Z direction, then input signal conditioning circuit carries out signal filtering and de-noising, then through data collecting card, collects computing machine and carry out signal processing and demonstration;
(5) according to the defect characteristic signal of computer acquisition, utilize transient signal analytical approach, extract the peak value that BX and the BZ induced voltage signal of detection probe in each position of surface of the work distributes, draw out along the BX of test path direction and the peak value squiggle of BZ, realize Intelligent Recognition and quantification to the sub-surface of workpiece and deep zone defect.
4. the subsurface defect detection method based on ac magnetic field according to claim 3, it is characterized in that: the described detection probe of step (2) is mainly comprised of BX magnetic test coil and the BZ magnetic test coil of quadrature, is respectively used to extract induced voltage signal in the distortion value of X and Z direction.
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| CN104296984A (en) * | 2014-10-20 | 2015-01-21 | 国家电网公司 | Mechanical failure detecting method and device for large-scale generator stator winding end |
| CN107520257A (en) * | 2016-06-22 | 2017-12-29 | 上海宝钢工业技术服务有限公司 | Strip mechanical performance on-line detecting system |
| CN108692193A (en) * | 2018-05-31 | 2018-10-23 | 中国石油化工股份有限公司 | A kind of Pulsed Eddy Current Testing System and method of small-caliber pipeline defect |
| CN109342549A (en) * | 2018-11-28 | 2019-02-15 | 中国石油大学(华东) | A kind of aluminium alloy pipeline inside and outside wall flaw detection probe |
| CN110346839A (en) * | 2019-07-30 | 2019-10-18 | 海南电网有限责任公司白沙供电局 | A kind of power distribution network shaft tower chassis, pulling plate and chuck detection system and method |
| CN111290032A (en) * | 2020-03-11 | 2020-06-16 | 中国石油大学(华东) | Electromagnetic-based intelligent stratum metal identification device and identification method |
| CN111458400A (en) * | 2020-04-09 | 2020-07-28 | 中北大学 | Metal material defect detection system based on electromagnetic induction |
| CN111982968A (en) * | 2020-08-22 | 2020-11-24 | 西安交通大学 | Magnetic management self-adaptive magnetic saturation eddy current infrared evaluation method based on controllable excitation |
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| CN110346839A (en) * | 2019-07-30 | 2019-10-18 | 海南电网有限责任公司白沙供电局 | A kind of power distribution network shaft tower chassis, pulling plate and chuck detection system and method |
| CN111290032A (en) * | 2020-03-11 | 2020-06-16 | 中国石油大学(华东) | Electromagnetic-based intelligent stratum metal identification device and identification method |
| CN111458400A (en) * | 2020-04-09 | 2020-07-28 | 中北大学 | Metal material defect detection system based on electromagnetic induction |
| CN111982968A (en) * | 2020-08-22 | 2020-11-24 | 西安交通大学 | Magnetic management self-adaptive magnetic saturation eddy current infrared evaluation method based on controllable excitation |
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