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Temperature-Insensitive Chemical Sensor with Twin Bragg Gratings in an Optical Fibre |
| SANG Xin-Zhu1;YU Chong-Xiu1;YAN Bin-Bin1;MA Jian-Xin1;MENG Zhao-Fang1;Mayteevarunyoo T.²;LU Nai-Guang3 |
| ¹Key Laboratory of Optical Communication and Lightwave Technologies, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876
²Department of Telecommunication Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand
³Department of Electronic Information Engineering, Beijing Institute of Machinery, Beijing 100085
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| Cite this article: |
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SANG Xin-Zhu, YU Chong-Xiu, YAN Bin-Bin et al 2006 Chin. Phys. Lett. 23 3202-3204 |
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Abstract To 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.
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| Keywords:
07. 07. Df
42. 81. Pa
07. 06. Vg
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Published: 01 December 2006
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