Acid-etched Fabry-Perot micro-cavities in optical fibres

Venkata Machavaram, RA Badcock, Gerard Fernando

Research output: Contribution to journalArticle


Significant progress has been made in recent years on the design and fabrication of optical fibre-based sensor systems for applications in structural health monitoring. Two sensor designs have tended to dominate namely, fibre Bragg gratings and extrinsic fibre Fabry-Perot sensors. However, the cost and time associated with these sensors is relatively high and as a consequence, the current paper describes a simple procedure to fabricate intrinsic fibre Fabry-Perot interferometric strain sensors. The technique involves the use of hydrofluoric acid to etch a cavity in a cleaved optical fibre. Two such etched cavities were fusion spliced to create an intrinsic fibre Fabry-Perot cavity. The feasibility of using this device for strain monitoring was demonstrated. Excellent correlation was obtained between the optical and surface-mounted electrical resistance strain gauge.
Original languageEnglish
Article number64231R
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1 Jan 2007
EventInternational Conference on Smart Materials and Nanotechnology in Engineering - Harbin, China
Duration: 1 Jul 20074 Jul 2007


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