研究目的
Investigating the sensitivity enhancement of gas pressure measurement using cascaded Fabry–Pérot interferometers with Vernier effect.
研究成果
The proposed cascaded FPIs configuration for gas pressure sensing achieves a sensitivity of -65.482 nm/MPa with Vernier effect, significantly improved over a single sensing FPI. This ultra-high sensitivity makes the sensor suitable for practical applications in gas pressure and concentration monitoring.
研究不足
Temperature crosstalk is a concern as the two FPIs with different configurations show very different responses to temperature fluctuation, which necessitates temperature compensated designs for accurate gas pressure measurement.
1：Experimental Design and Method Selection:
The experiment involves designing a cascade configuration of two Fabry–Pérot interferometers (FPIs) with different free spectral ranges (FSR) to exploit the Vernier effect for sensitivity enhancement in gas pressure measurement.
2：Sample Selection and Data Sources:
Two FPIs are fabricated using hollow core fiber (HCF) and single mode fiber (SMF), with one FPI serving as the sensing element and the other as the reference.
3：List of Experimental Equipment and Materials:
Femtosecond laser for drilling an opening on the HCF of the sensing FPI, high precision barometer (ConST 211) for monitoring gas pressure, and optical spectrum analyzer (OSA) for spectrum analysis.
4：Experimental Procedures and Operational Workflow:
The sensing FPI is exposed to varying gas pressures in a closed chamber, and the reflection spectrum is monitored for shifts. The reference FPI remains unaffected by pressure changes.
5：Data Analysis Methods:
The wavelength shift of the envelope extracted from the superimposed spectrum of the cascaded FPIs is analyzed to determine gas pressure sensitivity.
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