Flexible gauge length intrinsic fiber-optic strain sensor using broadband interferometry

Research output: Contribution to journalArticle


Monitoring strain is important in precision engineering applications that require maintaining the precise alignments of structures over time such as those found in machine tools and metrology frames. We present a fiber optic strain measurement technique based upon broadband interferometry that is variously configurable in terms of gauge length and sensitivity. This is achieved by the use of an unbalanced interrogation interferometer configuration which alleviates the cavity length limit imposed by the temporal coherence of the system. We also demonstrate that dispersion in fiber sensors based on intrinsic Fabry-Perot interferometers must be considered to optimise performance. The possibility of multi-sensor interrogation using the same optical system is also reported.
Original languageEnglish
Article number403294
Pages (from-to)1950-1957
Number of pages8
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Issue number12
Early online date2 Oct 2020
Publication statusPublished - 1 Dec 2020

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