Material near-surface macro-micro defect integrated ultrasonic detection method based on spatial modulation laser ultrasonic sound spectrum
A technology of laser ultrasound and space modulation, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, use of sound waves/ultrasonic waves/infrasonic waves for solid analysis, and material analysis. and other problems, to achieve the effect of improving detection coverage, good accessibility, and strong detection ability
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[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0019] The present invention is an integrated ultrasonic detection method for macro and micro defects near the surface of materials based on spatially modulated laser ultrasonic sound spectrum, such as figure 1 As shown, first, the double-pitch optical mask 2 is used to make the high-energy pulsed laser beam 1 irradiated on the surface of the material to be tested form two kinds of grid-shaped laser spots 3 with periodic distribution, and simultaneously excite the laser beams with wavelengths λ and λ in the measured area. a and lambda b (respectively corresponding to the first center frequency f a and the second center frequency f b ) of the first row of ultrasonic surface waves 4 and the second row of ultrasonic surface waves 5, and then the laser ultrasonic detection unit 6 receives the surface wave signal 7 on the surface side of the mater...
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