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Fiber optic displacement sensor based on a double‐reflecting OTDR technique
Author(s) -
Giraldi Maria Thereza M. Rocco,
Fernandes Cindy S.,
Ferreira Marta S.,
de Sousa Marco J.,
Jorge Pedro,
Costa João C. W. A.,
Santos José L.,
Frazão Orlando
Publication year - 2015
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.29086
Subject(s) - optical time domain reflectometer , optics , multi mode optical fiber , displacement (psychology) , fiber optic sensor , reflectometry , materials science , optical fiber , interferometry , millisecond , microwave , time domain , polarization maintaining optical fiber , physics , telecommunications , engineering , computer science , psychology , psychotherapist , astronomy , computer vision
In this work, it is proposed a technique to implement an intensity sensor based on the generation of a double‐reflecting (ghost) signal in optical time domain reflectometry (OTDR). The intensity sensor is supported by a singlemode‐multimode‐singlemode (SMS) fiber structure combined with a fiber loop mirror (FLM). The results of the displacement sensitivity show linear behavior for both the first‐reflecting and double‐reflecting signals with linear slopes of approximately −4.5 dB/mm and −6 dB/mm, respectively. The displacement resolution achieved is ∼0.28 mm. It is also found that the system is able to read periodic displacement variations in the millisecond time scale applied to the sensing head. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1312–1315, 2015
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