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Proceedings Paper

Accuracy evaluation of a hetero-core splice fiber optic sensor
Author(s): Y. Tani; H. Sasaki; Y. Kubota; K. Watanabe
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Paper Abstract

A Hetero-Core Splice Fiber Optic Sensor has a very simple structure in which a short-length, different core-size fiber is inserted in a single-mode-fiber network line with a low transmission loss for the wavelength of 1.31μm. In this study, a displacement sensor has been newly developed using a hetero-core spliced fiber optic element in a form of simple module structure and has been evaluated in terms of the accuracy as an OTDR(Optical Time Domain Reflectometer)-based measurement, for the purpose of the full-scale environmental monitoring. The developed sensor module is designed to have a coverage sensitive to a relatively large displacement in the range 0-5mm, for which a simple displacement-macrobending conversion mechanism has been adopted. A nickel alloy Invar with an extremely low linear expansion coefficient is used for the main parts of the module. Displacement is given to the module with a highly accurate micrometer of a minimum resolution of 0.5μm. The sensitivity showed a tendency proportional to the insertion length of hetero-core portion in the range from 1 to 2mm. The experiment promisingly showed sufficient reproducibility in the sensing operation with the accuracy less than 0.1% to the full span displacement of 5mm. Additionally, a pressure gauge using a hetero-core spliced fiber optic element has been newly developed in a form of module structure by applying the developed displacement sensor. The pressure gauge is designed to measure the change in length of a bellows due to pressurized air. The experiment achieved the measurement accuracy 0.3%[%FS] with highly showing the capability of all-light wave-based liquid level monitoring as a first demonstration based on a single mode fiber transmission concept, which could be very useful for environmental preservation.

Paper Details

Date Published: 24 September 2005
PDF: 8 pages
Proc. SPIE 5952, Optical Fibers: Applications, 59520L (24 September 2005); doi: 10.1117/12.622650
Show Author Affiliations
Y. Tani, SOKA Univ. (Japan)
H. Sasaki, SOKA Univ. (Japan)
Y. Kubota, SOKA Univ. (Japan)
K. Watanabe, SOKA Univ. (Japan)

Published in SPIE Proceedings Vol. 5952:
Optical Fibers: Applications
Leszek R. Jaroszewicz; Brian Culshaw; Anna Grazia Mignani, Editor(s)

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