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Proceedings Paper

Sensitivity property of a hetero-core-spliced fiber optic displacement sensor
Author(s): Hiroyuki Sasaki; Yuzuru Kubota; Kazuhiro Watanabe
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Paper Abstract

A displacement sensor has been newly developed using a hetero-core spliced fiber optic element in a form of simple module structure and evaluated in terms of the accuracy, reproducibility, and sensitivity as an OTDR-based, tandem connected displacement detector, for the purpose of the full-scale environmental monitoring. The developed sensor module is designed to be sensitive to a relatively large displacement in the range 0-5mm, for which a simple displacement-macrobending conversion mechanism in the module produces the change in the sensor transmission loss ranging from 0 to a few dB. The initial insertion loss only due to a hetero-core portion was 0.3dB. The sensitivity showed a tendency proportional to the insertion length of hetero-core portion in the range from 1 to 2mm. In contrast to conventional fiber distortion sensors such as FBG (Fiber Bragg Grating) and BOTDR (Brillouin Optical Time Domain Reflectometer), the hetero-core technique introduced in this work shows no temperature dependence in its sensor principle since the use of hetero-core makes it possible that change in backward Rayleigh scattering can be successfully amplified with a relatively large curvature. The experiment promisingly showed sufficient reproducibility the sensing operation with the accuracy less than 0.1% to the full span displacement of 5mm.

Paper Details

Date Published: 16 November 2004
PDF: 8 pages
Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); doi: 10.1117/12.566868
Show Author Affiliations
Hiroyuki Sasaki, Soka Univ. (Japan)
Yuzuru Kubota, Soka Univ. (Japan)
Kazuhiro Watanabe, Soka Univ. (Japan)


Published in SPIE Proceedings Vol. 5579:
Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers
Donna Strickland; Trevor J. Hall; Stoyan Tanev; Xiaoyi Bao; Franko Kueppers; David V. Plant, Editor(s)

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