An all-fiber Fabry-Pérot interferometer for pressure sensing in different gaseous environments |
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| Affiliation: | 1. INESC Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal;2. Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal;1. Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang Provincial Key Laboratory for Sensing Technologies, Zhejiang University, Hangzhou 310058, China;2. Yangtze Optical Electronics Co., Ltd. (YOEC), East Lake Hi-Tech Developzone, Wuhan, 430205, China;3. Department of Electromagnetic Engineering, School of Electrical Engineering, Stockholm S-100 44, Sweden;1. Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China;2. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanic, Chinese Academy of Sciences, Xi’an 710119, China;3. Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, China;4. Department of Physics, Yonsei University, Seoul 03722, Republic of Korea |
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| Abstract: | A gas pressure sensor based on an all-fiber Fabry-Pérot interferometer (FFPI) is reported. The sensing head consists of a small section of silica rod spliced with a large offset between two single-mode fibers. The silica rod is used only as mechanical support so that an air cavity can be formed between both SMF. It is shown that the FFPI sensor is sensitive to gas pressure variation and when submitted to different gaseous environments, namely carbon dioxide, nitrogen and oxygen – sensitivities of 6.2, 4.1 and 3.6 nm/MPa, respectively, were attained. The refractive index change on nitrogen environment by means of gas pressure variation was also determined and a sensitivity of 1526 nm/RIU was obtained. The response of the sensing device to temperature variations in air was also studied and a sensitivity of −14 pm/°C was attained. |
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| Keywords: | Optical fiber sensors Gas sensing Fabry-Pérot |
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