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Related Experiment Video

Updated: Jul 5, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
00:08

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

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Optimizing Algorithm for Existing Fiber-Optic Displacement Sensor Performance.

Zeina Elrawashdeh1,2, Christine Prelle3, Frédéric Lamarque3

  • 1Institut Catholique d'Arts et Métiers (ICAM), Site of Grand Paris Sud, 77127 Lieusaint, France.

Sensors (Basel, Switzerland)
|January 23, 2024
PubMed
Summary

This study optimized a miniature fiber-optic linear displacement sensor for high-resolution measurements. Geometric optimization of the triangular grating achieved the best performance for precise displacement sensing.

Keywords:
displacementfiber-optic sensorglobal optimummeasurement rangeresolutionsensitivity

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Last Updated: Jul 5, 2025

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Area of Science:

  • Optics and Photonics
  • Sensor Technology
  • Metrology

Background:

  • Accurate linear displacement measurement is crucial in various scientific and industrial applications.
  • Miniature sensors offer advantages in space-constrained environments.
  • Existing sensors may lack the required resolution for specific micro-scale applications.

Purpose of the Study:

  • To describe the optimal design of a miniature fiber-optic linear displacement sensor.
  • To achieve sub-micrometric resolution over a millimetric measurement range.
  • To enhance sensor resolution through geometric optimization of its core components.

Main Methods:

  • The sensor design incorporates a triangular reflective grating and two fiber-optic probes.
  • A geometric optimization approach was applied to the grating's step angle.
  • The measurement principle based on optical feedback was analyzed.

Main Results:

  • The optimized design enables linear displacement measurement within a millimetric range.
  • Sub-micrometric resolution was achieved, demonstrating high precision.
  • A global optimum for the grating's step angle was identified, maximizing sensor resolution.

Conclusions:

  • The geometrically optimized miniature fiber-optic linear displacement sensor offers superior resolution.
  • This sensor design is suitable for applications requiring precise micro-displacement measurements.
  • The optimization methodology provides a pathway for developing advanced optical sensing devices.