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A Quasi-Distributed Fiber-Optic Temperature Sensor With a Resolution of 0.07 ^{\circ} C Based on Fresnel Reflection

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4 Author(s)
Huang, Xu Guang ; Lab. of Photonic Inf. Technol., Univ. in Guangzhou U-City, Guangzhou, China ; Yi Ting Wu ; Hao Yang ; Yi Kun Xiong

A quasi-distributed fiber-optic temperature sensor for monitoring ambient temperature with a measured temperature resolution of approximately 0.07degC is presented. The sensor operates based on temperature-dependent Fresnel reflection from each interface between a distributed fiber tip and a thermooptic medium, and on the parallel demultiplexing of an arrayed waveguide grating. Thin-film filters are utilized to achieve wavelength-division multiplexing-distributed sensing. Good long-term stability and negligible channel crosstalk between two adjacent sensing heads with a wavelength spacing of 0.8 nm are experimentally achieved. Such a sensor would have biomedical and industrial applications where accurate measurements of temperatures and their locations are essential.

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Lightwave Technology, Journal of  (Volume:27 ,  Issue: 14 )