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27 November 1996 Wavelength-multiplexed multimode fiber optic sensor system
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The use of intensity based fiber optic senors has been limited to this point due to two factors. First, referencing the sensors is usually difficult because sensor modulation is indistinguishable from variable signal loss in other parts of the system. Secondly, the cost of the opto- electronics required for multiplexing numbers of these sensors has been prohibitive up to this time. In this paper, we present the results of an investigation into the use of wavelength multiplexing for intensity based fiber optic sensors as a solution to these problems. A demonstration system was fabricated using a transmissive star architecture and having fiber sensors plus a directly connected intensity reference channel. Three proximity sensors were multiplexed together with a fiber optic switch and fluid presence sensor. A theoretical basis is given for the system architecture chosen and performance details of the prototype system, which use cost effective off-the-shelf components for signal conditioning, are provided.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
William B. Spillman Jr., Robert D. LaClair, and W. W. Kuhns "Wavelength-multiplexed multimode fiber optic sensor system", Proc. SPIE 2838, Distributed and Multiplexed Fiber Optic Sensors VI, (27 November 1996);

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