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Proceedings Paper

The sensitivity of fiber Bragg grating based chemical sensor
Author(s): Zhaofang Meng; Binbin Yan; Xinzhu Sang; Chongxiu Yu; Kuiru Wang; Daxiong Xu
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Paper Abstract

The chemical sensing principle based on Fiber Bragg Grating (FBG) is presented. By deriving the relation between effective core index and surrounding index of etched FBG, the relation between Bragg wavelength and concentration of chemical solutions is analyzed, which is demonstrated in the experiment by measuring propylene glycol solutions. The factors influencing the sensitivity of chemical sensing is investigated. The results show that, the sensitivity of the Bragg wavelength of FBGs to the surrounding index can be enhanced with decreasing the diameter of FBGs by etching the fiber with HF solution. The sensitivity can be appreciably enhanced by etching the fiber diameters as small as 5.0 μm. A maximum sensitivity of 911.8 nm/riu is achieved. Since a shift of 0.01 nm can be detected, this leads to a detectable change of 1.1×10-5 in the surrounding index.

Paper Details

Date Published: 11 January 2008
PDF: 8 pages
Proc. SPIE 6830, Advanced Sensor Systems and Applications III, 68301I (11 January 2008); doi: 10.1117/12.756606
Show Author Affiliations
Zhaofang Meng, Beijing Univ. of Posts and Telecommunications (China)
Binbin Yan, Beijing Univ. of Posts and Telecommunications (China)
Xinzhu Sang, Beijing Univ. of Posts and Telecommunications (China)
Chongxiu Yu, Beijing Univ. of Posts and Telecommunications (China)
Kuiru Wang, Beijing Univ. of Posts and Telecommunications (China)
Daxiong Xu, Beijing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 6830:
Advanced Sensor Systems and Applications III
Yun-Jiang Rao; Yanbiao Liao; Gang-Ding Peng, Editor(s)

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