Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Instrumented Flexible Glass Structure: a Bragg Grating Inscribed with Femtosecond Laser used as a Bending Sensor

Loïc Amez-Droz
* ORCID logo ,
Matéo Tunon de Lara
,
Christophe Collette
,
Christophe Caucheteur
,
Pierre Lambert
Version 1 : Received: 25 August 2023 / Approved: 25 August 2023 / Online: 28 August 2023 (10:26:08 CEST)

A peer-reviewed article of this Preprint also exists.

Amez-Droz, L.; Tunon de Lara, M.; Collette, C.; Caucheteur, C.; Lambert, P. Instrumented Flexible Glass Structure: A Bragg Grating Inscribed with Femtosecond Laser Used as a Bending Sensor. Sensors 2023, 23, 8018. Amez-Droz, L.; Tunon de Lara, M.; Collette, C.; Caucheteur, C.; Lambert, P. Instrumented Flexible Glass Structure: A Bragg Grating Inscribed with Femtosecond Laser Used as a Bending Sensor. Sensors 2023, 23, 8018.

Abstract

Fused silica glass is a material with outstanding mechanical, thermal and optical properties. Being a brittle material, it is challenging to shape. In the last decade, the manufacturing of monolithic flexible mechanisms in fused silica has evolved with the femtosecond laser-assisted etching process. However, instrumenting those structures is demanding. To address this obstacle, this article proposes to inscribe a Bragg Grating sensor inside a flexure and interface it with an optical fibre to record the strain using a spectrum analyzer. The strain sensitivity of this Bragg Grating sensor is characterized at 1.2 pm/μϵ (1 μϵ = 1 microstrain). Among other applications, deformation sensing can be used to record a force. Its use as a micro-force sensor is estimated. The sensor resolution is limited by our recording equipment to 30 μN over a measurement range above 10 mN. This technology can offer opportunities for surgery applications or others where precision and stability in harsh environments are required.

Keywords

Compliant mechanism; fused silica; femtosecond laser; Bragg grating sensor

Subject

Engineering, Mechanical Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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