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Instrumented Flexible Glass Structure: A Bragg Grating Inscribed with Femtosecond Laser Used as a Bending Sensor.

Loïc Amez-Droz1,2, Matéo Tunon de Lara2,3, Christophe Collette1,4

  • 1Department of Aerospace and Mechanical Engineering, Université de Liège, Allée de la Découverte 9, 4000 Liege, Belgium.

Sensors (Basel, Switzerland)
|October 14, 2023
PubMed
Summary

This study introduces a novel Bragg Grating sensor inscribed within fused silica flexures for precise strain and micro-force measurement. This innovation enables stable sensing in demanding environments, like surgical applications.

Keywords:
Bragg grating sensorcompliant mechanismfemtosecond laserfused silica

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Fused silica glass offers excellent mechanical, thermal, and optical properties but is challenging to shape.
  • Femtosecond-laser-assisted etching enables manufacturing of monolithic flexible mechanisms in fused silica.
  • Instrumenting these delicate structures for sensing applications presents significant challenges.

Purpose of the Study:

  • To develop a method for instrumenting flexible fused silica mechanisms with strain sensors.
  • To propose and characterize a Bragg Grating sensor inscribed within a fused silica flexure.
  • To evaluate the potential of this sensor for micro-force measurement.

Main Methods:

  • Inscribing a Bragg Grating sensor directly into a fused silica flexure.
  • Interfacing the inscribed sensor with an optical fiber.
  • Utilizing a spectrum analyzer to record strain data.
  • Characterizing the strain sensitivity and micro-force resolution of the sensor.

Main Results:

  • The Bragg Grating sensor demonstrated a strain sensitivity of 1.2 pm/μϵ.
  • The sensor's micro-force resolution was determined to be 30 μN over a range exceeding 10 mN.
  • The developed sensor is capable of recording deformation and force with high precision.

Conclusions:

  • The proposed method successfully integrates Bragg Grating sensors into fused silica flexures for strain and micro-force sensing.
  • This technology offers a stable and precise sensing solution for applications in harsh environments.
  • Potential applications include surgical tools and other precision instrumentation requiring robust sensing capabilities.