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Related Experiment Video

Updated: Feb 11, 2026

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Continuous-Wave Fiber Cavity Ringdown Pressure Sensing Based on Frequency-Shifted Interferometry.

Yiwen Ou1,2, Chunfu Cheng3,4, Zehao Chen5,6

  • 1Hubei Collaborative Innovation Center for High-Efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430068, China. ouyiwen@hbut.edu.cn.

Sensors (Basel, Switzerland)
|April 17, 2018
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Summary
This summary is machine-generated.

A new fiber cavity ringdown (FCRD) pressure sensor uses frequency-shifted interferometry (FSI) to measure light decay. This method offers a simple, cost-effective, and stable approach for accurate pressure detection.

Keywords:
fiber cavity ringdownfrequency-shifted interferometrypressure sensingsensitivity

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Area of Science:

  • Optical sensing
  • Fiber optics
  • Interferometry

Background:

  • Traditional cavity ringdown (CRD) and fiber cavity ringdown (FCRD) techniques often require optical pulsation and fast electronics.
  • Accurate and stable pressure sensing is crucial in various industrial and scientific applications.

Purpose of the Study:

  • To present a continuous-wave fiber cavity ringdown (FCRD) pressure-sensing method based on frequency-shifted interferometry (FSI).
  • To demonstrate a simplified FCRD scheme that avoids optical pulsation and fast electronics for pressure measurement.

Main Methods:

  • Utilized a continuous-wave fiber cavity ringdown (FCRD) setup incorporating frequency-shifted interferometry (FSI).
  • Employed a section of optical fiber with a stripped buffer layer as the sensor head within the fiber ringdown cavity (RDC).
  • Measured pressure by analyzing the spatial decay rate (CRD distance) of continuous light exiting the RDC.

Main Results:

  • Successfully measured pressures in the range of 0 to 10.4 MPa.
  • Achieved a sensitivity of 0.02356/(km∙MPa) with a measurement error of 0.1%.
  • Obtained a pressure resolution of 0.05 MPa, with sensitivity improvable by increasing sensor head interaction length.

Conclusions:

  • The proposed FSI-FCRD sensor offers a simple structure and low cost.
  • The sensor demonstrates high sensitivity and stability for pressure detection.
  • This method provides an advantageous alternative to traditional CRD and FCRD techniques.