Driving power supply device with high-impedance electromagnetic coil
A technology of electromagnetic coils and driving power, 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: 2014-03-12
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] A driving power supply device for high-impedance electromagnetic coils will be described in detail below in combination with examples and accompanying drawings.
[0013] like 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 c...
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The invention relates to a driving power supply device with a high-impedance electromagnetic coil, which comprises a signal generator, a power amplification device, an impedance matcher, an EMAT (electro magnetic acoustic transducer) transmitting probe and an EMAT receiving probe. According to the invention, the common EMAT transmitting probe is used and an acoustic emission signal can be excited at the position of a defect (a crack-type surface defect of a metal sheet made of a ferromagnetic material), so that non-destructive detection and estimation of the defect are implemented. The EMAT transmitting probe is arranged above a region which needs to be reinspected and intensively detected; a high-frequency high-amplitude pulse sine wave excitation voltage is applied; the excitation voltage subjected to energy focusing excites a high-energy eddy current in a region to be detected; the defect is excited by the magnetostriction force and the Lorentz force of the ferromagnetic material to emit the acoustic emission signal so as to implement non-destructive detection and estimation of the defect; the device can effectively improve detection capacity of an EMAT on a mobile defect, a local closed defect and a microcrack and has high industrial application value.
Description
technical field [0001] A driving power supply device for high-impedance electromagnetic coils is an 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 p...
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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