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Proceedings Paper

Optical water-level sensing systems using fiber Bragg grating
Author(s): Keisuke Fukuchi; Seiji Kojima; Yasuyuki Hishida; Akihito Hongo
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Paper Abstract

We have developed the all optical high-precision water level sensors based on fiber Bragg grating (FBG) technique, which are applied for actual fields such as rivers, lakes, sewage systems and so on. The sensor head consists of a diaphragm, a customized Bourdon tube and two FBGs, one for tensile measurement and other for temperature compensation. The FBG attached to the Bourdon tube is strained as the water level increases, and causes center wavelength shift of the reflected light fromt he FBG, which is detected by the wavelength interrogation equipment composed of a tunable Fabry-Perot filer. We have achieved the sensor accuracy of +/- 0.1% F.S., i.e. +/- 1 cm in case of full measurement range of 10 m. Several sensor heads can be connected in series through one optical fiber and each water level at different places can be measured simultaneously by one wavelength interrogation equipment.

Paper Details

Date Published: 9 September 2002
PDF: 8 pages
Proc. SPIE 4920, Advanced Sensor Systems and Applications, (9 September 2002); doi: 10.1117/12.482013
Show Author Affiliations
Keisuke Fukuchi, Hitachi Cable, Ltd. (Japan)
Seiji Kojima, Hitachi Cable, Ltd. (Japan)
Yasuyuki Hishida, Hitachi Cable, Ltd. (Japan)
Akihito Hongo, Hitachi Cable, Ltd. (Japan)

Published in SPIE Proceedings Vol. 4920:
Advanced Sensor Systems and Applications
Yun-Jiang Rao; Julian D. C. Jones; Hiroshi Naruse; Robert I. Chen, Editor(s)

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