Method and apparatus for receiving ultrasonic energy by optical means
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United States of America Patent
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-
Aug 24, 1982
Grant Date -
N/A
app pub date -
Nov 10, 1980
filing date -
Jan 25, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
When sensing the presence of ultrasonic energy in a workpiece portion by illuminating such portion with light from a single-mode frequency stabilized laser, the reflected light, frequency modulated by the Doppler effect due to the ultrasonic energy induced deflection of the workpiece portion, is passed through a gas filled light filter. The frequency modulated light is amplitude modulated by the filter by selecting the frequency of the laser to cause a point of operation which is located along a steep slope portion of the absorption curve characteristic of the filter. To increase the steepness of the slope portion of the filter, the present invention discloses the use of laser light to saturate the filter in a part region.
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