Non-contact wave velocity extracting method of like surface acoustic wave of plating layer structure
A wave velocity extraction, non-contact technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, process detection response signals, etc.
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[0040] Below in conjunction with specific example, content of the present invention is described in further detail:
[0041] Step 1): Establish the formula for wave velocity extraction.
[0042] In the case of single frequency excitation / reception, figure 2 In the schematic diagram of the propagation of the leaky surface wave shown, the propagation time of the direct reflection echo I on the upper surface and the propagation time of the leaky surface wave L are respectively:
[0043] t 1 = 2 ( R - Vz ) v w - - - ( 1 )
[0044] t 2 = 2 ( R ...
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