Analysis of temperature-insensitive sensor probe for SRI measurement via etched cladding FM-FBG

Xiao Liang; Zhaoxin Geng; Jingcong Li; Zhiming Liu

doi:10.1117/12.2547861

18 December 2019 Analysis of temperature-insensitive sensor probe for SRI measurement via etched cladding FM-FBG

Xiao Liang, Zhaoxin Geng, Jingcong Li, Zhiming Liu

Proceedings Volume 11340, AOPC 2019: Optical Fiber Sensors and Communication; 113401J (2019) https://doi.org/10.1117/12.2547861
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

A novel temperature-insensitive sensor probe is proposed and experimentally characterized. The sensor probe uses an etching cladding Few Mode Fiber Bragg Grating (FM-FBG) to sense the surrounding refractive indexes (SRI), which depends on the reflection peaks. To compensate for the temperature effect in SRI sensing, various guides modes in FM-FBG that have the different sensing behaviors are used for implementation. Both the propagation characteristics and operation principle of such a sensor are demonstrated in detail. A sensitivity of ~2 nm per refractive index unit (RIU) are obtained within the SRI range of 1.333–1.373. This sensor is temperature independent due to the temperature-insensitive nature of wavelength differential Δλ between the two reflection peaks of the etching cladding FM-FBG.

Citation Download Citation

Xiao Liang, Zhaoxin Geng, Jingcong Li, and Zhiming Liu "Analysis of temperature-insensitive sensor probe for SRI measurement via etched cladding FM-FBG", Proc. SPIE 11340, AOPC 2019: Optical Fiber Sensors and Communication, 113401J (18 December 2019); https://doi.org/10.1117/12.2547861

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KEYWORDS

Sensors

Cladding

Fiber Bragg gratings

Temperature metrology

Etching

Refractive index

Fiber optics sensors

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