Separated-cavity Fabry-Perot interferometric gas pressure sensor based on hollow core Bragg fiber and Vernier effect

Zongru Yang; Weihao Yuan; Changyuan Yu

doi:10.1117/12.2642213

20 December 2022 Separated-cavity Fabry-Perot interferometric gas pressure sensor based on hollow core Bragg fiber and Vernier effect

Zongru Yang, Weihao Yuan, Changyuan Yu

Author Affiliations +

Proceedings Volume 12314, Optoelectronic Devices and Integration XI; 1231413 (2022) https://doi.org/10.1117/12.2642213
Event: SPIE/COS Photonics Asia, 2022, Online Only

Conference Poster

Abstract

An ultra-high sensitivity separated Fabry-Perot interferometers (FPIs) sensor for gas pressure measurement based on hollow core Bragg fiber (HCBF) and Vernier effect is proposed. The HCBF functions as an FPI cavity and possesses low transmission loss. The sensing unit was prepared by splicing an HCBF at the millimeter scale between the single-mode fiber (SMF) and the hollow silica tube (HST). The reference unit was fabricated by sandwiching the HCBF between two SMFs. Both FPIs with similar free spectral ranges (FSRs) were connected to the 3-dB coupler parallelly to generate the Vernier effect. Experimental results showed that the proposed sensor achieved high gas pressure sensitivity of 77.80 nm/MPa with a linearity of 0.9992. Moreover, a low-temperature crosstalk of ~0.095 kPa/℃ implies that the sensor is temperature insensitive. Compared to the traditional optical fiber gas pressure sensor, the proposed sensor features high sensitivity, stability, easy fabrication, and fast response.

Conference Presentation

Citation Download Citation

Zongru Yang, Weihao Yuan, and Changyuan Yu "Separated-cavity Fabry-Perot interferometric gas pressure sensor based on hollow core Bragg fiber and Vernier effect", Proc. SPIE 12314, Optoelectronic Devices and Integration XI, 1231413 (20 December 2022); https://doi.org/10.1117/12.2642213

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