Optical fiber sensors with full common-mode compensation and measurand sensitivity enhancement
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United States of America Patent
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Feb 5, 1991
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N/A
app pub date -
Jan 17, 1989
filing date -
Jan 17, 1989
priority date (Note) -
Expired
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Abstract
Optical interferometric sensors exhibiting enhanced measurand sensitivity and complete common-mode compensation. The sensors add two additional light couplers and two optical paths with predetermined path lengths to known optical sensors such as the Mach-Zehnder, Recirculating Delay Line, Michelson-Morley, and Fabry-Perot sensors to produce sensors which exhibit complete common-mode compensation thereby greatly improving measured signal-to-noise ratio. An electronic feedback circuit can be employed in any of the sensors resulting in enhanced measured sensitivity.
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