CN102590353A - Acoustic emission excitation device of EMAT (Electro Magnetic Acoustic Transducer) transmitting probe - Google Patents
Acoustic emission excitation device of EMAT (Electro Magnetic Acoustic Transducer) transmitting probe Download PDFInfo
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- CN102590353A CN102590353A CN2012100076571A CN201210007657A CN102590353A CN 102590353 A CN102590353 A CN 102590353A CN 2012100076571 A CN2012100076571 A CN 2012100076571A CN 201210007657 A CN201210007657 A CN 201210007657A CN 102590353 A CN102590353 A CN 102590353A
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- emat
- transmitting probe
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Abstract
The invention discloses an acoustic emission excitation device of an EMAT (Electro Magnetic Acoustic Transducer) transmitting probe. The acoustic emission excitation device comprises a signal generator, a power amplification device, an impedance matcher, an EMAT transmitting probe and an EMAT receiving probe. According to the invention, an acoustic emission signal can be excited at a defect (crack type surface defect of a sheet metal of a ferromagnetic material) by using a normal EMAT transmitting probe, so that nondestructive testing and nondestructive evaluation of the defect can be realized. The nondestructive testing and nondestructive evaluation of the defect is realized by the steps of: arranging the EMAT transmitting probe above an area which needs recheck and key detection, putting through a high-frequency and high-amplitude pulse sine wave excitation voltage, exciting high-energy eddy on an area to be detected through energy focused excitation voltage and exciting the defect per se to send out an acoustic emission signal by utilizing magnetostriction force and Lorentz force of the ferromagnetic material. The acoustic emission excitation device has the advantages of improving detection capability of the EMAT for movable defects, local closed defects and micro-cracks efficiently and having a good industrial application value.
Description
Technical field
The acoustic emission excitation apparatus of EMAT transmitting probe is the innovation and application and the development of EMAT nondestructive testing technique principle.The EMAT transmitting probe is arranged in the top that needs reinspection and focus detection area territory; Pass to the pulsed sine wave driving voltage of high frequency, amplitude; Driving voltage through energy focusing excites the high energy eddy current on zone to be detected; Utilize the magnetostrictive force and the Lorentz force of ferromagnetic material to excite defective self to send lossless detection and assessment that acoustic emission signal realizes defective; This device can improve the detectability of EMAT to mobile defect, local closed defective and microcrack effectively, has the favorable industrial using value.
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 makes traditional EMAT technology be difficult to satisfy detection speed and the detection sensitivity demand that nondestructive examination detects; Acoustic emission becomes the important additional technology of EMAT technology with its high sensitivity and dynamic monitoring characteristic, can improve the detectability of EMAT to mobile defect, local closed defective and microcrack effectively.
Summary of the invention
Technical matters to be solved by this invention is, uses common EMAT transmitting probe, locates to excite acoustic emission signal in defective (the sheet metal crack type surface imperfection of ferromagnetic material), thereby realizes the detection to mobile defect, local closed defective and microcrack.The exciting current of EMAT transmitting probe, distributes with the form of arithmetic progression to maximum amplitude from starting point, through analyzing acoustic emission signal and without the relation of exciting current defective being judged.
The technical scheme that the present invention adopts is: signal generator (2), and power amplifier device (3), impedance matching box, EMAT transmitting probe (4), EMAT accepts probe.
The signal circuit that the control loop that signal generator (2) is made up of a single-chip microcomputer and DDS chip are formed is formed, for the power amplifier device (3) of back provides frequency drive end high-frequency impulse input signal accurately.
Power amplifier device (3) is a D class full-bridge inverting power amplifier; For transformer at the back provides the low alternating voltage that distorts, the alternating voltage that amplifies through transformer is that the resonant tank that resonant capacitance and EMAT transmitting probe are formed provides energy through impedance matching box.
EMAT transmitting probe (4) is the EMAT probe of a low-frequency range, uses printed-board technology on circuit board, to make the inflection coil, uses permanent magnet to improve the acoustic emission effect, on surface of contact, covers the wear-resisting compound substance of one deck.EMAT accepts probe and adopts the structure identical with EMAT to form, and sends out the signal excitation and the receiving system of a receipts pattern one to one.
Description of drawings
Fig. 1 is an 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 EMAT transmitting probe.
Embodiment
Below in conjunction with instance and accompanying drawing the acoustic emission excitation apparatus of EMAT transmitting probe 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; Is alternating voltage through signal generator (2) power controlling multiplying arrangement (3) with its inversion, after transformer boosts, becomes the input voltage of impedance matching box.The resonant tank that resonant capacitance and EMAT transmitting probe are formed is the load of transformer after impedance matching box carries out impedance matching.Be loaded into the sinusoidal voltage that obtains in the resonant tank and on sheet metal, excite eddy current to produce acoustic emission signal, use EMAT to accept to pop one's head in acquired signal and output to prime amplifier, realize eddy current excitation acoustic emission signal through EMAT transmitting probe (4).
As shown in Figure 2, the control signal that after single-chip microcomputer receives, transfers the DDS chip to from the signal of keyboard or computer 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 through Q1, Q2, Q3 and Q4 alternately to turn on and off the 190V dc inversion be alternating voltage; For transformer at the back provides the low alternating voltage that distorts, the alternating voltage that amplifies through transformer is that the resonant tank that resonant capacitance and EMAT transmitting probe are formed provides energy through impedance matching box.
As shown in Figure 4, the EMAT transmitting probe is the EMAT probe of a low-frequency range, uses printed-board technology on circuit board, to make the inflection coil, uses permanent magnet to improve the acoustic emission effect, on surface of contact, covers the wear-resisting compound substance of one deck.
Claims (4)
1.EMAT the acoustic emission excitation apparatus of transmitting probe is characterized in that being provided with: signal generator (2), power amplifier device (3), impedance matching box, EMAT transmitting probe (4), EMAT accepts probe.
2. the acoustic emission excitation apparatus of EMAT transmitting probe according to claim 1; Its characteristic also is; The alternating current of 220v is exported to power amplifier device (3) through the direct current of overcommutation realization 190v; Is alternating voltage through signal generator (2) power controlling multiplying arrangement (3) with its inversion, after transformer boosts, becomes the input voltage of impedance matching box; The resonant tank that resonant capacitance and EMAT transmitting probe are formed is the load of transformer after impedance matching box carries out impedance matching; Be loaded into the sinusoidal voltage that obtains in the resonant tank and on sheet metal, excite eddy current to produce acoustic emission signal, use EMAT to accept to pop one's head in acquired signal and output to prime amplifier, realize eddy current excitation acoustic emission signal through EMAT transmitting probe (4).
3. the acoustic emission excitation apparatus of EMAT transmitting probe according to claim 1; Its characteristic also is; The exciting current of EMAT transmitting probe, distributes with the form of arithmetic progression to maximum amplitude from starting point, through analyzing acoustic emission signal and without the relation of exciting current defective being judged.
4. the acoustic emission excitation apparatus of EMAT transmitting probe according to claim 1; Its characteristic also is; D class full-bridge inverting power amplifier device through Q1, Q2, Q3 and Q4 alternately to turn on and off the 190V dc inversion be alternating voltage; For transformer at the back provides the low alternating voltage that distorts, the alternating voltage that amplifies through transformer is that the resonant tank that resonant capacitance and EMAT transmitting probe are formed provides energy through impedance matching box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100076571A CN102590353A (en) | 2012-01-12 | 2012-01-12 | Acoustic emission excitation device of EMAT (Electro Magnetic Acoustic Transducer) transmitting probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100076571A CN102590353A (en) | 2012-01-12 | 2012-01-12 | Acoustic emission excitation device of EMAT (Electro Magnetic Acoustic Transducer) transmitting probe |
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| Publication Number | Publication Date |
|---|---|
| CN102590353A true CN102590353A (en) | 2012-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100076571A Pending CN102590353A (en) | 2012-01-12 | 2012-01-12 | Acoustic emission excitation device of EMAT (Electro Magnetic Acoustic Transducer) transmitting probe |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837581A (en) * | 2014-03-17 | 2014-06-04 | 中国科学院电工研究所 | Detection device for lithium ion battery |
| CN106053614A (en) * | 2016-05-18 | 2016-10-26 | 重庆大学 | Improved electromagnetic ultrasonic transducer of LCL resonance circuit and component parameter design method thereof |
| CN108896649A (en) * | 2018-04-28 | 2018-11-27 | 南京航空航天大学 | Method for estimating yield strength of ferromagnetic material based on electromagnetic ultrasound |
| CN112684013A (en) * | 2020-12-02 | 2021-04-20 | 哈尔滨工业大学 | Multi-wavelength electromagnetic ultrasonic transducer coil design method |
-
2012
- 2012-01-12 CN CN2012100076571A patent/CN102590353A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837581A (en) * | 2014-03-17 | 2014-06-04 | 中国科学院电工研究所 | Detection device for lithium ion battery |
| CN103837581B (en) * | 2014-03-17 | 2016-03-23 | 中国科学院电工研究所 | A kind of lithium ion battery pick-up unit |
| CN106053614A (en) * | 2016-05-18 | 2016-10-26 | 重庆大学 | Improved electromagnetic ultrasonic transducer of LCL resonance circuit and component parameter design method thereof |
| CN106053614B (en) * | 2016-05-18 | 2018-11-13 | 重庆大学 | The electromagnet ultrasonic changer and its component parameter design method of modified LCL resonance circuits |
| CN108896649A (en) * | 2018-04-28 | 2018-11-27 | 南京航空航天大学 | Method for estimating yield strength of ferromagnetic material based on electromagnetic ultrasound |
| CN108896649B (en) * | 2018-04-28 | 2021-05-07 | 南京航空航天大学 | Method for estimating yield strength of ferromagnetic material based on electromagnetic ultrasound |
| CN112684013A (en) * | 2020-12-02 | 2021-04-20 | 哈尔滨工业大学 | Multi-wavelength electromagnetic ultrasonic transducer coil design method |
| CN112684013B (en) * | 2020-12-02 | 2023-11-21 | 哈尔滨工业大学 | Design method of multi-wavelength electromagnetic ultrasonic transducer coil |
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Application publication date: 20120718 |