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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
PubMed
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.

Keywords:
Vernier effectextrinsic Fabry-Perot interferometerfemtosecond lasergas pressure

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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.