Fiber optic sensor
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United States of America Patent
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-
Oct 25, 1994
Grant Date -
N/A
app pub date -
Oct 30, 1987
filing date -
Oct 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fiber optic sensor includes a generally cylindrical housing including a fiber optic transmitter in one end connected to a source of light, a sensor within the housing attached to the cylindrical wall of the housing exposed to the transmitted light and responsive to a sensed condition such as acoustic pressure waves to modulate the light, and a fiber optic receiver for receiving the modulated light and supplying it to an external circuit. The sensor may be a thin film fastened to the wall or it may include a diffraction pattern on a reflective inside surface of the wall which will produce a modulated light output with movement of the wall. The thin film may be fastened to the wall directly or suspended by means of Euler struts. The thin film may include a reflective spot and/or a moire pattern for modulating the light. Another embodiment includes a resiliently mounted mass fastened to a thin film which may have quadrature or other patterns which would alter the light modulation pattern depending upon the direction of a sensed acceleration.
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