Method and apparatus for sensing ultrasonic energy

Details Method and apparatus for sensing ultrasonic energy Method and apparatus for sensing ultrasonic energy

1980-02-21

1981-06-30

Corbin, John K.

Optics: measuring and testing

Material strain analysis

By light interference detector

356319, 356360, G01B 1116, G01B 902

Patent

active

042759633

ABSTRACT:
The acoustic energy responsive deformation of a workpiece surface is sensed in a contact-free manner by optical means using a laser which illuminates the surface at which deformation is expected. The reflection light energy is transmitted to an optical interferometer as previously shown in the art. The present improvement comprises the use of a multi-wavelength laser beam light and separating the light after passing through the interferometer into the distinct wavelengths. Each light signal corresponding to a specific wavelength is converted individually to an electrical signal, each electrical signal is rectified, and the plurality of rectified signals are then averaged in an electrical summing means.

REFERENCES:
patent: 3145252 (1964-08-01), Herriott
patent: 3804521 (1974-04-01), Sprague
patent: 4046477 (1977-09-01), Kaule
patent: 4145140 (1979-03-01), Fujii
patent: 4180324 (1979-12-01), Primbsch
Abdulladir et al. "Optical Surface Roughness & Slopes Measurements with a Double Beam Spectrophotometer", Rev. Sci. Instrum. 11-1974, pp. 1356-1360.

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