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Cascaded-Cavity Fabry-Perot Interferometric Gas Pressure Sensor based on Vernier Effect
Peng Chen1, Yutang Dai2, Dongsheng Zhang3
1National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China. chenpeng16@whut.edu.cn.
Sensors (Basel, Switzerland)
|November 2, 2018
Summary
A novel extrinsic Fabry-Perot interferometer (EFPI) sensor utilizing the Vernier effect significantly enhances gas pressure sensing. This compact sensor demonstrates a 32.8 times higher sensitivity compared to conventional designs.
Area of Science:
- Optoelectronics
- Fiber Optics Sensing
- Interferometry
Background:
- Fiber optic sensors offer advantages in harsh environments.
- Fabry-Perot interferometers (FPis) are sensitive to external stimuli.
- Enhancing the sensitivity of FPIs is crucial for precise measurements.
Purpose of the Study:
- To fabricate and investigate an extrinsic Fabry-Perot interferometer (EFPI) sensor for gas pressure sensing.
- To leverage the Vernier effect for enhanced sensor sensitivity.
- To evaluate the sensor's performance, including sensitivity and temperature cross-sensitivity.
Main Methods:
- Fabrication of a double fiber FPI within a glass capillary tube.
- Utilizing femtosecond laser ablation for creating gas passages and fusion holes.
- Employing the Vernier effect to amplify the interferometric response.
- Experimental characterization of gas pressure sensing performance.
Main Results:
- The developed EFPI sensor exhibits a high sensitivity of 86.64 nm/MPa within the 0–0.6 MPa range.
- Sensitivity is 32.8 times greater than open-cavity EFPI sensors lacking the Vernier effect.
- Measured temperature cross-sensitivity is approximately 5.18 KPa/°C.
Conclusions:
- The proposed Vernier-effect-enhanced EFPI sensor offers significantly improved gas pressure sensitivity.
- The sensor features a compact structure and straightforward fabrication process.
- This technology holds considerable promise for advanced gas sensing applications.
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