Structure optimization of long-period fiber grating gas-sensing sensors

Yanping Xu; Zhengtian Gu; Jiabi Chen; Kan Gao

doi:10.1117/12.558957

15 September 2004 Structure optimization of long-period fiber grating gas-sensing sensors

Yanping Xu, Zhengtian Gu, Jiabi Chen, Kan Gao

Proceedings Volume 5547, Remote Sensing in Atmospheric Pollution Monitoring and Control; (2004) https://doi.org/10.1117/12.558957
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

The response of a long-period grating coated with the sol-gel derived films on the cladding of the fiber grating region to surrounding medium (gases) was studied in this paper based on coupled-mode theory. A four-layered numerical model is also developed to determine the dependence of the central wavelengths of the attenuation bands on the thin film optical parameters ( thickness d₃and refractive index n₃). By analyzing the relation between the sensitivity S_n and the thin film optical parameters and the fiber grating parameters (the grating period, the core index change and the grating length ), the optimal optical parameters of thin film layer of the sensor is obtained. Data simulation shows that the sensitivity of this scheme to refractive index of the films is predicted to be more than 10⁷. In the end a gas-sensitive long-period grating sensor is fabricated according to the theoretical optimization results. The preliminary gas-sensing experiment was performed, and a novel LPFG gas sensor special to C₂H₅OH and CH₄ was established.

Citation Download Citation

Yanping Xu, Zhengtian Gu, Jiabi Chen, and Kan Gao "Structure optimization of long-period fiber grating gas-sensing sensors", Proc. SPIE 5547, Remote Sensing in Atmospheric Pollution Monitoring and Control, (15 September 2004); https://doi.org/10.1117/12.558957

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