Optical fiber sensors with full common-mode compensation and measurand sensitivity enhancement

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Date

1991-02-05

Authors

Buckman, A. Bruce

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United States Patent and Trademark Office

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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