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Research on a Novel Fabry⁻Perot Interferometer Model Based on the Ultra-Small Gradient-Index Fiber Probe.

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A new gradient-index fiber probe enhances Fabry-Perot (F-P) interferometer performance for micro-vibration measurements. This novel F-P interferometer shows significantly higher output voltage than traditional single-mode fiber systems.

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Area of Science:

  • Optics and Photonics
  • Fiber Optic Sensing
  • Metrology

Background:

  • Fabry-Perot (F-P) interferometers are crucial for precise measurements.
  • Traditional single-mode fiber (SMF) F-P interferometers have limitations in sensitivity and output voltage.
  • Miniaturization is key for sensing in confined spaces.

Purpose of the Study:

  • To investigate a novel F-P interferometer model utilizing an ultra-small gradient-index (GRIN) fiber probe.
  • To enhance the performance of F-P interferometers for micro-vibration and displacement measurements.
  • To compare the novel GRIN fiber F-P interferometer with traditional SMF F-P interferometers.

Main Methods:

  • Development of a theoretical model integrating an ultra-small GRIN fiber probe with the F-P interferometer's signal arm.
  • Construction of an experimental system for vibration measurements.
  • Performance evaluation of the novel F-P interferometer system at various working distances and cavity lengths.

Main Results:

  • The novel GRIN fiber F-P interferometer achieved an output voltage of 3.9 V at a working distance of 0.506 mm.
  • This output voltage is substantially higher than the 0.48 V from an SMF F-P interferometer at the same position.
  • The novel interferometer consistently demonstrated higher output voltage than the SMF F-P interferometer within a cavity length range of 0.1–2 mm.

Conclusions:

  • The novel F-P interferometer based on an ultra-small GRIN fiber probe offers superior performance.
  • It provides significantly higher output voltage compared to conventional SMF F-P interferometers.
  • This technology is promising for precise micro-vibration and displacement measurements in narrow or confined spaces.