Synchronous interrogation of multiple FBG sensors using multi-wavelength parallel swept light source

Diannan Hu; Zhaoying Wang; Quan Yuan; Taoran Xie; Dongfang Jia

doi:10.1117/12.2327121

23 October 2018 Synchronous interrogation of multiple FBG sensors using multi-wavelength parallel swept light source

Diannan Hu, Zhaoying Wang, Quan Yuan, Taoran Xie, Dongfang Jia

Proceedings Volume 10821, Advanced Sensor Systems and Applications VIII; 1082115 (2018) https://doi.org/10.1117/12.2327121
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

In this paper, a multi-wavelength parallel swept light source (MWPSS) is proposed for fiber Bragg grating (FBG) interrogation. The MWPSS has two main parts: a multi-wavelength light source used as a seed source and a synchronous lightwave synthesized frequency sweeper (SLSFS). The multi-wavelength of the seed source is shifted with a constant frequency sweeping step synchronously every circulation in the SLSFS. There is a one-to-one correspondence between the swept range of the seed source and the central reflection wavelength of each FBG sensor. By interrogating the data of reflection intensity in time-domain to calculate the difference between the center wavelength of each sensing FBG and the reference FBG, 10.055±0.005pm/°C temperature sensitivity and 1.614±0.002pm/με static strain sensitivity were obtained synchronously without cross-talk.

Citation Download Citation

Diannan Hu, Zhaoying Wang, Quan Yuan, Taoran Xie, and Dongfang Jia "Synchronous interrogation of multiple FBG sensors using multi-wavelength parallel swept light source", Proc. SPIE 10821, Advanced Sensor Systems and Applications VIII, 1082115 (23 October 2018); https://doi.org/10.1117/12.2327121

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