Sang Xin-Zhu et al 2006 Chinese Phys. Lett. 23 3202 doi:10.1088/0256-307X/23/12/022
Sang Xin-Zhu1, Yu Chong-Xiu1, Yan Bin-Bin1, Ma Jian-Xin1, Meng Zhao-Fang1, T. Mayteevarunyoo2 and Lu Nai-Guang3
Show affiliationsTo reduce temperature sensitivity of the fibre Bragg grating (FBG) chemical sensor, a simple method is proposed by measuring the peak wavelength difference between an etched FBG and an un-etched one in an optical fibre. Thermal characteristics and chemical sensitivity of the sensor are experimentally investigated. The experimental results indicate that the etched FBG and the rest one have almost the same thermal response, and concentration changes of the surrounding chemical solutions can be detected by measuring the peak wavelength difference between them. The sensor has been used to measure the concentrations of propylene glycol solutions and sugar solutions, and it could detect 0.7% and 0.45% concentration changes for them with an optical spectrum analyser in resolution of 10 pm.
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
Issue 12 (December 2006)
Received 15 August 2006
Sang Xin-Zhu et al 2006 Chinese Phys. Lett. 23 3202
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