Electromagnetic ultrasonic power supply device
A power supply device, electromagnetic ultrasonic technology, applied in the direction of material analysis using acoustic wave emission technology, can solve the difficult problems of non-destructive testing detection speed and detection sensitivity requirements, and achieve good industrial application value
Inactive Publication Date: 2014-02-26
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology
[0002] With the development of manufacturing technology, materials are required to have good performance and reliability under high temperature, high pressure, high speed and high load, which makes it difficult for traditional EMAT technology to meet the detection speed and detection sensitivity requirements of nondestructive testing. Emission technology has become an important supplementary technology to EMAT technology due to its high sensitivity and dynamic monitoring characteristics, which can effectively improve the detection ability of EMAT for active defects, partially closed defects and micro cracks
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[0012] An electromagnetic ultrasonic power supply device will be described in detail below in combination with examples and accompanying drawings.
[0013] Such as figure 1 As shown, the 220v AC is rectified to achieve 190v DC output to the power amplifier (3), and the power amplifier (3) is controlled by the signal generator (2) to invert it into an AC voltage, and after the voltage is boosted by the transformer, becomes the input voltage of the impedance matcher. The resonant circuit composed of the resonant capacitor and the EMAT transmitting probe is the load of the transformer after the impedance matching is carried out by the impedance matching device. The sinusoidal voltage obtained by loading into the resonant circuit excites the eddy current on the metal plate through the EMAT transmitting probe (4) to generate an acoustic emission signal, and uses the EMAT receiving probe to collect the signal and output it to the preamplifier to realize the eddy current excitation ...
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The invention discloses an electromagnetic ultrasonic power supply device which comprises a signal generator, a power amplification device, an impedance matcher, an EMAT (electro magnetic acoustic transducer) emitting probe and an EMAT receiving probe. The electromagnetic ultrasonic power supply device can excite an acoustic emission signal at a defect (namely a crack type surface defect of a metal sheet of a ferromagnetic material) through the common EMAT emitting probe, so that non-destructive detection and evaluation of the defect can be realized. The EMAT emitting probe is arranged above a region needing rechecking or an important detection region and is fed with pulse sine wave excitation voltage with high frequency and high amplitude, and high-energy eddy current is excited on the region to be detected through the energy-focused excitation voltage; furthermore, the defect is excited to emit the acoustic emission signal through magnetostrictive force and lorentz force of the ferromagnetic material, and thus the non-destructive detection and the evaluation of the defect are realized. The device can effectively improve the detection capacity of an EMAT to movable defects, locally closed defects and tiny cracks and has a high industrial application value.
Description
technical field [0001] An electromagnetic ultrasonic power supply device is the innovative application and development of the principle of EMAT non-destructive flaw detection technology. Arrange the EMAT transmitting probe above the area to be re-inspected and the key detection area, pass a high-frequency, high-amplitude pulsed sine wave excitation voltage, and use the energy-focused excitation voltage to excite high-energy eddy currents on the area to be inspected, using ferromagnetic materials The magnetostrictive force and Lorentz force excite the defect itself to emit an acoustic emission signal to realize the non-destructive detection and evaluation of the defect. This device can effectively improve the detection ability of EMAT for active defects, partially closed defects and micro cracks, and has good industrial performance. Value. Background technique [0002] With the development of manufacturing technology, materials are required to have good performance and relia...
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IPC IPC(8): G01N29/14
Inventor 金亮张献李劲松杨庆新李阳刘素贞张闯
Owner TIANJIN POLYTECHNIC UNIV