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IOP Publishing, Measurement Science and Technology, 2(22), p. 025203

DOI: 10.1088/0957-0233/22/2/025203

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Experimental demonstration of a simple displacement sensor based on a bent single-mode–multimode–single-mode fiber structure

Journal article published in 2011 by Qiang Wu, Yuliya Semenova ORCID, Pengfei Wang, Agus Muhamad Hatta, Gerald Farrell ORCID
Distributing this paper is prohibited by the publisher
Distributing this paper is prohibited by the publisher

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Abstract

A simple displacement sensor based on a bent single-mode–multimode–single-mode (SMS) fiber structure is proposed and experimentally investigated. The sensor offers a wider displacement range, not limited by the risk of fiber breakage, as well as a three-fold increase in displacement sensitivity by comparison with a straight SMS structure sensor. This sensor can be interrogated by either an optical spectral analyzer (OSA) or a ratiometric interrogation system: (1) if interrogated by an OSA assuming a resolution of 1 pm, it has a sensitivity of 28.2 nm for a displacement measurement range from 0 to 280 µm; (2) if interrogated by a ratiometric interrogation system, it has worst and best case resolutions of 556 and 38 nm, respectively, for a displacement measurement range from 0 to 520 µm.