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Two-Parameter Elliptical Fitting Method for Short-Cavity Fiber Fabry⁻Perot Sensor Interrogation.

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  • 1School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710021, China. zhangxiongxing@xatu.edu.cn.

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Summary
This summary is machine-generated.

A new method accurately measures short fiber Fabry-Perot sensors using improved elliptical fitting. This technique resolves cavity length for sensors lacking full spectral periods, achieving high resolution and accuracy.

Keywords:
elliptical fitting methodfiber Fabry–Perot sensorshort cavitywhite light interference

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Area of Science:

  • Optics and Photonics
  • Sensor Technology
  • Signal Processing

Background:

  • White light spectral interrogation is crucial for fiber Fabry-Perot (FP) sensors.
  • Short cavity FP sensors present challenges due to incomplete spectral periods.
  • Amplified spontaneous emissions (ASEs) are common white light sources.

Purpose of the Study:

  • To develop a robust data processing method for interrogating short cavity fiber FP sensors.
  • To address the limitations of existing methods for sensors with incomplete reflection spectra.
  • To improve the accuracy and resolution of cavity length measurements.

Main Methods:

  • An improved elliptical fitting equation with only two undetermined coefficients was developed.
  • The method processes spectral data from white light sources like ASEs.
  • Extrinsic fiber Fabry-Perot air-gap sensors with short cavities (<30 μm) were used for verification.

Main Results:

  • The proposed method successfully interrogates short cavity fiber FP sensors.
  • High resolution cavity length measurements were achieved even with incomplete spectral periods.
  • Experimental verification demonstrated an accuracy better than 0.55%.

Conclusions:

  • The improved elliptical fitting method offers a reliable solution for short cavity fiber FP sensor interrogation.
  • This technique enhances the performance of white light spectral interrogation systems.
  • The method provides a practical approach for accurate sensor characterization in various applications.