研究目的
Investigating the high-sensitivity measurement of gas refractive index using an all-fiber Fabry-Perot interferometer based on lateral offset splicing and Vernier Effect.
研究成果
The proposed gas RI sensor based on lateral offset splicing and Vernier Effect is highly sensitive to RI, with a sensitivity of 16335.96 nm/RIU, which is 11.12 times that of a single sensor FPI. The sensor has broad application prospects in gas composition detection, environmental monitoring, biosensors, and other fields.
研究不足
The method may be complex and expensive due to the use of femtosecond laser micromachining for producing an open cavity. The sensor's performance may be affected by temperature variations.
1：Experimental Design and Method Selection:
The sensor head consists of a closed reference FPI and an open sensing FPI connected by two optical fiber circulators. The sensing FPI is made into an open cavity by lateral offset splicing of single mode fibers (SMFs), and the reference FPI is spliced by SMF and fiber tube. The Vernier Effect is generated due to the close but unequal free spectral range (FSR) of the reference FPI and the sensing FPI.
2：Sample Selection and Data Sources:
The two FPIs are sealed in a gas chamber, and the gas RI in the gas chamber can be changed by an air pump.
3：List of Experimental Equipment and Materials:
Broadband light source (BBS), optical spectral analyzer (OSA), fiber circulators, single mode fibers (SMFs), fiber tube.
4：Experimental Procedures and Operational Workflow:
The light from the broadband light source passes through FPI1 and FPI2 successively and is received by the optical spectral analyzer. The reflective spectrum of FPI1, FPI2, and FPIs at RI=1.0002663 in the gas chamber are measured.
5：0002663 in the gas chamber are measured.
Data Analysis Methods:
5. Data Analysis Methods: The reflection spectrum function of the cavities is analyzed to determine the sensitivity of the gas RI measurement.
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