Variable coupler fiber optic sensor hydrophone
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United States of America Patent
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Sep 23, 1997
Grant Date -
N/A
app pub date -
Jul 6, 1989
filing date -
Jul 6, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rigid plate with an aperture therethrough has a variable coupler fiber optic sensor encapsulated in the aperture by an encapsulant having an index of refraction that varies with applied stress. Incident light applied to an input fiber of the coupler is coupled to the output fibers thereof in a ratio dependent on the stress applied to the encapsulant. In an alternative embodiment, a well in a member superposed with respect to the plate is filled with a low bulk modulus material which abuts the encapsulant.
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