Measuring and testing – Vibration – By mechanical waves
Patent
1984-06-13
1986-04-15
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73655, 73657, G01N 2904, G01H 900
Patent
active
045819394
ABSTRACT:
The surface of a specimen to be inspected is irradiated with a light having an intensity which varies from a position distant from the material, so that ultrasonic beams are generated in the material to be inspected. A coherent light is also projected onto a fixed surface provided at a given position and onto the surface of said material to be inspected. Vibration generated in the surface of said material due to ultrasonic beams reflected by a defect in the material, is detected in the form of change in phase of the coherent light that is reflected by the surface of the material. The change of difference in phase between the coherent light reflected by said fixed surface and the coherent light reflected by the surface of the material is measured with the lapse of time, in order to detect the flaw.
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Birmiel Howard A.
Hitachi , Ltd.
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