5 March 1993 Multiplexed fiber optic temperature-sensing system
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Abstract
A multiplexed temperature sensing system is constructed by cascading three temperature sensors along one multimode fiber such that each individual sensor responds to its local temperature disturbance. The sensing element of each sensor is a dielectric edge filter with a specific cutoff wavelength. White light serves as the light source. The performance of this sensor is based on the temperature dependence of the reflection or transmission spectrum of each filter. The reflected or transmitted light from the filter is then sent to two dielectric bandpass filters, which are selected for each particular edge filter and referred to as the sensing and reference filters, respectively. A photometer is placed behind each bandpass filter. The ratio of the sensing filter power to the reference filter power is a function of temperature. Since the cutoff wavelengths of these edge filters (sensors) along the fiber are well separated, the multiplexed signals are divided by different pairs of bandpass filters. In the corresponding experiments, three edge filters were cascaded and 100/104 micrometers graded index fibers were used. A resolution of each temperature sensor was determined to be +/- 0.2 degree(s)C over the temperature range of 30 degree(s)C to 100 degree(s)C.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anbo Wang, George Z. Wang, Kent A. Murphy, Mark S. Miller, Richard O. Claus, "Multiplexed fiber optic temperature-sensing system", Proc. SPIE 1797, Distributed and Multiplexed Fiber Optic Sensors II, (5 March 1993); doi: 10.1117/12.141285; https://doi.org/10.1117/12.141285
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