Apparatus and method for the remote detection of vibrations of d

Details Apparatus and method for the remote detection of vibrations of d Apparatus and method for the remote detection of vibrations of d

1975-01-02

1976-04-27

Queisser, Richard C.

Measuring and testing

Moisture content or absorption characteristic of material

356109, G01H 900

Patent

active

039525830

ABSTRACT:
Apparatus and method for the remote detection of vibrations of diffuse surfaces. A beam of coherent light incident on a vibrating diffuse surface is scattered. A photodetector sees the scattering as a time-varying intensity distribution related to the vibration frequency of the surface. The detected time-varying intensity distribution is converted into time-varying electrical currents which can be rendered audible by using a loudspeaker or visual by using an oscilloscope.

REFERENCES:
patent: 3476483 (1969-11-01), Weeks
patent: 3702737 (1972-11-01), Mottier
patent: 3804521 (1974-04-01), Sprague
N. Fernelius et al., Vibration Analysis Using Changes of Laser Speckle, .S.A., May 1971, pp. 566-572.

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