Expected Noise Levels For Interferometric Sensors Multiplexed Using Partially Coherent Light

R. H. Wentworth; H. J. Shaw

doi:10.1117/12.949792

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

R. H. Wentworth, H. J. Shaw

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.

Citation Download Citation

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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