Miniaturised gap sensor using fibre optic Fabry-Pérot interferometry for structural health monitoring

Tamer Y. Cosgun*, Adrian Dzipalski, Calum A. Ross, Robert R. Thomson, Matthew Kingston, Simon Brooks, William N. MacPherson

*Corresponding author for this work

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Abstract

A miniaturised structural health monitoring device has been developed capable of measuring the absolute distance between close parallel surfaces using Fabry-Pérot interferometry with nm-scale sensitivity. This is achieved by fabricating turning mirrors on two opposite cores of a multi-core fibre to produce a probe with dimensions limited only be the fibre diameter. Two fabrication processes have been investigated: Focused ion beam milling, which has resulted in a sensor measurement accuracy, sensitivity and range of ±0.056 µm, ±0.006 µm and ∼16000 µm respectively; and ultrafast laser assisted etching of the cleaved fibre end, where a sensor measurement accuracy, sensitivity and range of ±0.065 µm, ±0.006 µm and ∼7500 µm have been demonstrated.

Original languageEnglish
Pages (from-to)42923-42932
Number of pages10
JournalOptics Express
Volume30
Issue number24
Early online date7 Nov 2022
DOIs
Publication statusPublished - 21 Nov 2022

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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