Gas pressure sensor based on a hollow cavity modulated phase shifted fiber Bragg grating

Shengzhen Lu; Junxian Luo; Shen Liu; Yiping Wang

doi:10.1117/12.2604486

1 November 2021 Gas pressure sensor based on a hollow cavity modulated phase shifted fiber Bragg grating

Shengzhen Lu, Junxian Luo, Shen Liu, Yiping Wang

Proceedings Volume 12057, Twelfth International Conference on Information Optics and Photonics; 120570X (2021) https://doi.org/10.1117/12.2604486
Event: Twelfth International Conference on Information Optics and Photonics, 2021, Xi'an, China

Abstract

A new type of gas pressure sensor based on a phase-shifted fiber Bragg grating (PS-FBG) modulated by a hollow cavity is proposed and demonstrated. The device was fabricated by fusing a hollow-core fiber (HCF) between two single-mode fibers (SMFs) exhibiting FBGs inscribed using line-by-line femtosecond (fs) laser etching. A pair of micro-channels were drilled orthogonally to the HCF using an fs laser, to allow the argon gas to get in and out freely. This sensor has high spectral accuracy, for example, the Q factor is about 7302, which can be improved by reducing the number of grating pitches. Further, a high pressure sensitivity of 1.22 nm/Mpa was obtained, which corresponds to an improved sensor with a grating pitch of 300 and a cavity length of 88.3 um. In addition, the device exhibited a low temperature sensitivity of 8.92 pm/oC.

Citation Download Citation

Shengzhen Lu, Junxian Luo, Shen Liu, and Yiping Wang "Gas pressure sensor based on a hollow cavity modulated phase shifted fiber Bragg grating", Proc. SPIE 12057, Twelfth International Conference on Information Optics and Photonics, 120570X (1 November 2021); https://doi.org/10.1117/12.2604486

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