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Proceedings Paper

Field demonstration of 10-nano static strain resolution multiplexed FBG sensor for geophysical applications
Author(s): Qingwen Liu; Tomochika Tokunaga; Katsuro Mogi; Hiroya Matsui; Herbert F. Wang; Teruyuki Kato; Zuyuan He
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Paper Abstract

We have developed an FBG sensor with a strain resolution better than 10 nano-strain (10-8) for geophysics applications. The sensor consists of a pair of identical FBGs, one for strain sensing and the other for reference. A narrow linewidth tunable laser is used to interrogate the two FBGs simultaneously. Cross-correlation algorithm is utilized to extract the Bragg wavelength difference between the FBGs with high precision. Multiplexed sensing is achieved using WDM technique. With this sensor, the crustal deformation induced by oceanic tide at Aburatsubo Bay in Japan is clearly observed with a strain resolution better than 10 nε. This is the first that 10 nε order static strain resolution is demonstrated with FBG sensors, providing a potential tool for the geophysics applications.

Paper Details

Date Published: 30 January 2012
PDF: 6 pages
Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 835103 (30 January 2012);
Show Author Affiliations
Qingwen Liu, The Univ. of Tokyo (Japan)
Tomochika Tokunaga, The Univ. of Tokyo (Japan)
Katsuro Mogi, The Univ. of Tokyo (Japan)
Hiroya Matsui, Japan Atomic Energy Agency (Japan)
Herbert F. Wang, Univ. of Wisconsin-Madison (United States)
Teruyuki Kato, The Univ. of Tokyo (Japan)
Zuyuan He, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 8351:
Third Asia Pacific Optical Sensors Conference
John Canning; Gangding Peng, Editor(s)

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