Self-Referencing Multiplexing Technique For Intensity Modulating Fiber Optic Sensors

W B Spillman Jr.; J R. Lord

doi:10.1117/12.937514

28 April 1987 Self-Referencing Multiplexing Technique For Intensity Modulating Fiber Optic Sensors

W B Spillman Jr., J R. Lord

Proceedings Volume 0718, Fiber Optic and Laser Sensors IV; (1987) https://doi.org/10.1117/12.937514
Event: Cambridge Symposium-Fiber/LASE '86, 1986, Cambridge, MA, United States

Abstract

An all-optical technique for multiplexing and self-referencing a number of intensity modulating fiber optic sensors is described. The optical transducers are fabricated as integral parts of recirculating optical fiber loops connected in parallel between transmit and receive optical fibers. A portion of an input pulse is tapped off by each sensor loop module. Successive fractions are tapped off on each circulation around the loop and transmitted to a detector. These form pulse trains that characterize each sensor's output. The relative magnitudes of the components of the pulse train are insensitive to lead and connector losses between the sensor modules and the source and detector. Time division multiplexing of the sensor return signals is created by the delays introduced by the fiber leads between the sensor modules. This paper details the response of a single sensor loop versus theoretical performance, and a three sensor system is demonstrated.

Citation Download Citation

W B Spillman Jr. and J R. Lord "Self-Referencing Multiplexing Technique For Intensity Modulating Fiber Optic Sensors", Proc. SPIE 0718, Fiber Optic and Laser Sensors IV, (28 April 1987); https://doi.org/10.1117/12.937514

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