Expected Noise Levels For Interferometric Sensors Multiplexed Using Partially Coherent Light

R. H. Wentworth; H. J. Shaw

doi:10.1117/12.949792

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3 January 1986 Expected Noise Levels For Interferometric Sensors Multiplexed Using Partially Coherent Light

R. H. Wentworth, H. J. Shaw

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Proceedings Volume 0566, Fiber Optic and Laser Sensors III; (1986) https://doi.org/10.1117/12.949792
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

A method for multiplexing interferometric optical sensors is reviewed, and theoretical results are presented which predict the phase sensitivity of sensors multiplexed using this method. The multiplexing technique--"coherence multiplexing' is based on the use of a source whose coherence length is short compared to most system optical path length differences. The use of a single-mode semiconductor laser diode source typically leads to a min-imum detectable phase on the order of a milliradian per VHz. Small improvements result from the use of a noise-canceling balanced detection scheme. Sensitivity in the microradian per VHz regime might be achieved through the use of a shorter coherence length source such as a superluminescent diode.

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R. H. Wentworth and H. J. Shaw "Expected Noise Levels For Interferometric Sensors Multiplexed Using Partially Coherent Light", Proc. SPIE 0566, Fiber Optic and Laser Sensors III, (3 January 1986); https://doi.org/10.1117/12.949792

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