Field demonstration of 10-nano static strain resolution multiplexed FBG sensor for geophysical applications

Qingwen Liu; Tomochika Tokunaga; Katsuro Mogi; Hiroya Matsui; Herbert F. Wang; Teruyuki Kato; Zuyuan He

doi:10.1117/12.915958

30 January 2012 Field demonstration of 10-nano static strain resolution multiplexed FBG sensor for geophysical applications

Qingwen Liu, Tomochika Tokunaga, Katsuro Mogi, Hiroya Matsui, Herbert F. Wang, Teruyuki Kato, Zuyuan He

Author Affiliations +

Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 835103 (2012) https://doi.org/10.1117/12.915958
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia

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.

Citation Download Citation

Qingwen Liu, Tomochika Tokunaga, Katsuro Mogi, Hiroya Matsui, Herbert F. Wang, Teruyuki Kato, and Zuyuan He "Field demonstration of 10-nano static strain resolution multiplexed FBG sensor for geophysical applications", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 835103 (30 January 2012); https://doi.org/10.1117/12.915958

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