Abstract
A quasi-distributed fiber-optic temperature sensor for monitoring ambient
temperature with a measured temperature resolution of approximately 0.07 $^{\circ}$C 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.
© 2009 IEEE
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