Apparatus for sensing ultrasonic waves by optical means

Details Apparatus for sensing ultrasonic waves by optical means Apparatus for sensing ultrasonic waves by optical means

1981-04-20

1983-05-03

Birmiel, Howard A.

Measuring and testing

Vibration

Sensing apparatus

356358, G01B 902, G01N 2900

Patent

active

043816762

ABSTRACT:
An apparatus for sensing the acoustic energy responsive deformation of a workpiece surface by optical means, that is without physical contact with the workpiece surface, comprises the use of a laser light beam illuminating the workpiece surface portion along which the acoustic energy responsive deformation is manifest. The laser light incident upon the workpiece surface is reflected at the workpiece surface and, modulated responsive to the surface deflection, is transmitted to an optical phase interferometer and to a photoelectric means associated therewith. The output from the photoelectric means is transmitted to an evaluation unit. The improvement shown in this invention concerns means for maintaining the reflected light intensity at a predetermined level by comparing the reflected light intensity with a preset level and feeding a control signal to a light control means controlling the laser light intensity incident upon the workpiece surface.

REFERENCES:
patent: 4013366 (1977-03-01), Philbert
patent: 4046477 (1977-09-01), Kaule
patent: 4129041 (1978-12-01), Bickel

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