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A Fresnel-reflection-based fiber sensor for simultaneous measurement of liquid concentration and temperature

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3 Author(s)
Zhao, Jia Rong ; Laboratory of Photonic Information Technology, South China Normal University, Guangzhou 510006, China ; Xu Guang Huang ; Chen, Ji Huan

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We present a quasidistributed fiber sensor for simultaneous measurement of liquid concentration and temperature based on Fresnel reflection. Thin-film filters combined with an arrayed waveguide grating are utilized to achieve wavelength-division-multiplexing distributed sensing. By measuring the Fresnel-reflection signals from the sensing heads, each of which consists of two fiber sensing tips, simultaneous measurement of liquid concentration and temperature is obtained. The experimental results reveal that the sensing system can discriminate the concentration and temperature of a NaClH2O liquid with high concentration and temperature accuracies of ±0.07 % and ±0.35 °C, respectively.

Published in:

Journal of Applied Physics  (Volume:106 ,  Issue: 8 )

Date of Publication:

Oct 2009

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