CN102928503A - Electromagnetic acoustic emission nondestructive inspection device for metal plate - Google Patents
Electromagnetic acoustic emission nondestructive inspection device for metal plate Download PDFInfo
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- CN102928503A CN102928503A CN201210413837.XA CN201210413837A CN102928503A CN 102928503 A CN102928503 A CN 102928503A CN 201210413837 A CN201210413837 A CN 201210413837A CN 102928503 A CN102928503 A CN 102928503A
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- acoustic emission
- nondestructive inspection
- signal
- defects
- snakelike coil
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Abstract
The invention discloses an electromagnetic acoustic emission nondestructive inspection device for a metal plate. The electromagnetic acoustic emission nondestructive inspection device comprises a signal generator, a power amplifier, an impedance matcher, a serpentine coil and a serpentine coil-type signal reception probe. Through the utilization of the serpentine coil, an acoustic emission signal can be excited at defects (which are metal thin sheet crack-type surface defects) and thus nondestructive inspection and evaluation of the defects are realized. The serpentine coil is arranged above areas needing to be detected repeatedly and mainly and is applied with high-frequency high-amplitude pulse square wave excitation voltage; through energy focused excitation voltage, a high-energy eddy current is excited in the area needing to be detected; and a magnetostriction force and a Lorentz force of a ferromagnetic material stimulate the defects to emit acoustic emission signals so that nondestructive inspection and evaluation of the defects are realized. The electromagnetic acoustic emission nondestructive inspection device can effectively improve mobile defect, local closed defect and microcrack detection capacities of an acoustic emission technology and has a good industrial application value.
Description
Technical field
The present invention is a kind of acoustic emission detection method, specifically is exactly a kind ofly to utilize snakelike coil to encourage acoustic emission signal to carry out the method for nondestructive examination in sheet metal.
Background technology
Development along with manufacturing technology, require material under high temperature, high pressure, high-speed and high load capacity, good Performance And Reliability to be arranged, this is so that traditional flaw detection is difficult to satisfy detection speed and the detection sensitivity demand that nondestructive examination detects, and acoustic emission becomes effective detection technique of visual plant and main equipment with its high sensitivity and dynamic monitoring characteristic.
How Electromagnetic Testing Technology and acoustic emission are combined, with difficulty and the complexity of processing at the prerequisite decline low signal that keeps the acoustic emission advantage, to be suitable for actual commercial Application, become an important research direction.
Summary of the invention
Technical matters to be solved by this invention is to use snakelike coil to locate to excite acoustic emission signal in defective (the sheet metal crack type surface imperfection of ferromagnetic material), thereby realize the detection to mobile defect, local closed defective and microcrack.The exciting current of snakelike coil is from 0 to maximum amplitude, with the formal distribution of arithmetic progression, by analyzing acoustic emission signal and without the relation of exciting current defective being judged.
The technical solution used in the present invention is: signal generator (2), power amplifier device (3), impedance matching box, snakelike coil (4), serpentine ring type probe receiver.
The signal circuit that the control loop that signal generator (2) is comprised of a single-chip microcomputer and DDS chip form forms, for the power amplifier device (3) of back provides accurately drive end high-frequency impulse input signal of frequency.
Power amplifier device (3) is a D class full-bridge inverting power amplifier, and for the transformer of back provides the alternating voltage of low distortion, the alternating voltage that amplifies through transformer provides energy by impedance matching box for snakelike coil.
Snakelike coil (4) is made snakelike coil for using printed-board technology at circuit board, uses permanent magnet to improve acoustic emission effect, covers the wear-resisting compound substance of one deck at surface of contact.
Serpentine ring type probe receiver adopts and the identical structure of snakelike coil (4).
Description of drawings
Fig. 1 is one-piece construction block diagram of the present invention;
Fig. 2 is the signal generator schematic diagram;
Fig. 3 is the power amplifier device after the optimal design;
Fig. 4 is the schematic diagram of snakelike coil.
Embodiment
Below in conjunction with example and accompanying drawing the acoustic emission detection method of snakelike coil is made detailed description.
As shown in Figure 1, the alternating current of 220v is exported to power amplifier device (3) through the direct current of overcommutation realization 190v, be square-wave voltage by signal generator (2) power ratio control multiplying arrangement (3) with its inversion, after transformer boosts, become the input voltage of impedance matching box.Snakelike coil is the load of transformer after impedance matching box carries out impedance matching.The square-wave pulse that is loaded into snakelike coil (4) excites eddy current to produce acoustic emission signal at sheet metal, and serpentine ring type probe receiver collection signal also outputs to prime amplifier, realizes eddy current excitation acoustic emission signal.
As shown in Figure 2, the control signal that transfers the DDS chip to from the signal of keyboard or computer after single-chip microcomputer receives realizes that stable high-frequency controling signal exports driving power multiplying arrangement (3).
As shown in Figure 3, D class full-bridge inverting power amplifier device by Q1, Q2, Q3 and Q4 alternately to turn on and off the 190V dc inversion be alternating voltage, for the transformer of back provides the alternating voltage of low distortion, the alternating voltage that amplifies through transformer provides energy by impedance matching box for serpentine ring type probe receiver.
As shown in Figure 4, serpentine ring type probe receiver uses permanent magnet to improve acoustic emission effect for using printed-board technology to make snakelike coil at circuit board, covers the wear-resisting compound substance of one deck at surface of contact.
Substantive distinguishing features of the present invention is that the voltage waveform that is loaded into coil is square-wave pulse.
Substantial advantage of the present invention is under the pulse excitation, and the acoustic emission signal of fault location can comprise more defect information, can improve the detectability to the defective comprehensive state.
Claims (4)
1. the electromagnetic sound of sheet metal emission non-destructive detection device is characterized in that being provided with: signal generator (2), power amplifier device (3), impedance matching box, snakelike coil (4), serpentine ring type probe receiver.
2. a kind of acoustic emission detection system of metal material according to claim 1, be further characterized in that, the alternating current of 220v is exported to power amplifier device (3) through the direct current of overcommutation realization 190v, be alternating voltage by signal generator (2) power ratio control multiplying arrangement (3) with its inversion, after transformer boosts, become the input voltage of impedance matching box; Snakelike coil carries out being the load of transformer after the impedance matching; The square-wave pulse that is loaded into snakelike coil (4) excites eddy current to produce acoustic emission signal at sheet metal, uses snakelike coil collection signal and outputs to prime amplifier, realizes eddy current excitation acoustic emission signal.
3. the acoustic emission detection system of a kind of metal material according to claim 1, be further characterized in that, the exciting current of the acoustic emission detection method of snakelike coil from starting point to maximum amplitude, with the formal distribution of arithmetic progression, by analyzing acoustic emission signal and without the relation of exciting current defective being judged.
4. the acoustic emission detection system of a kind of metal material according to claim 1, be further characterized in that, D class full-bridge inverting power amplifier device by Q1, Q2, Q3 and Q4 alternately to turn on and off the 190V dc inversion be alternating voltage, for the transformer of back provides the alternating voltage of low distortion, the alternating voltage that amplifies through transformer provides energy by impedance matching box for the acoustic emission detection method of snakelike coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210413837.XA CN102928503A (en) | 2012-10-24 | 2012-10-24 | Electromagnetic acoustic emission nondestructive inspection device for metal plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210413837.XA CN102928503A (en) | 2012-10-24 | 2012-10-24 | Electromagnetic acoustic emission nondestructive inspection device for metal plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102928503A true CN102928503A (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201210413837.XA Pending CN102928503A (en) | 2012-10-24 | 2012-10-24 | Electromagnetic acoustic emission nondestructive inspection device for metal plate |
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| CN (1) | CN102928503A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271572A (en) * | 2017-07-31 | 2017-10-20 | 沈阳工业大学 | Electromagnetic acoustic sheet metal flaw detection transducer |
| CN111279182A (en) * | 2019-01-18 | 2020-06-12 | 合刃科技（深圳）有限公司 | Method and system for detecting metal surface |
| CN111537599A (en) * | 2020-05-28 | 2020-08-14 | 中国特种设备检测研究院 | Magneto acoustic emission detection method for fatigue damage of ferromagnetic metal component |
-
2012
- 2012-10-24 CN CN201210413837.XA patent/CN102928503A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271572A (en) * | 2017-07-31 | 2017-10-20 | 沈阳工业大学 | Electromagnetic acoustic sheet metal flaw detection transducer |
| CN107271572B (en) * | 2017-07-31 | 2023-09-26 | 沈阳工业大学 | Electromagnetic ultrasonic metal sheet flaw detection transducer |
| CN111279182A (en) * | 2019-01-18 | 2020-06-12 | 合刃科技（深圳）有限公司 | Method and system for detecting metal surface |
| WO2020147096A1 (en) * | 2019-01-18 | 2020-07-23 | 合刃科技（深圳）有限公司 | Method and system for metal surface detection |
| CN111537599A (en) * | 2020-05-28 | 2020-08-14 | 中国特种设备检测研究院 | Magneto acoustic emission detection method for fatigue damage of ferromagnetic metal component |
| CN111537599B (en) * | 2020-05-28 | 2024-03-19 | 中国特种设备检测研究院 | Magneto acoustic emission detection method for fatigue damage of ferromagnetic metal component |
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Application publication date: 20130213 |