Affiliation:
1. Zhejiang Normal University
2. Hong Kong Polytechnic University
3. Yangtze Optical Electronics Co., Ltd. (YOEC)
Abstract
A highly sensitive inline gas pressure sensor based on the hollow core Bragg fiber (HCBF) and harmonic Vernier effect (VE) is proposed and experimentally demonstrated. By sandwiching a segment of HCBF between the lead-in single-mode fiber (SMF) and the hollow core fiber (HCF), a cascaded Fabry–Perot interferometer is produced. The lengths of the HCBF and HCF are precisely optimized and controlled to generate the VE, achieving a high sensitivity of the sensor. Meanwhile, a digital signal processing (DSP) algorithm is proposed to research the mechanism of the VE envelope, thus providing an effective way to improve the sensor’s dynamic range based on calibrating the order of the dip. Theoretical simulations are investigated and matched well with the experimental results. The proposed sensor exhibits a maximum gas pressure sensitivity of 150.02 nm/MPa with a low temperature cross talk of 0.00235 MPa/∘C. All these advantages highlight the sensor’s enormous potential for gas pressure monitoring under various extreme conditions.
Funder
Shenzhen Municipal Science and Technology Innovation Council
Innovation and Technology Fund
Hong Kong Polytechnic University
Subject
Atomic and Molecular Physics, and Optics
Cited by
4 articles.
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