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Proceedings Paper

Optical fiber sensors for landslide monitoring
Author(s): Yong Liu; Zhiyong Dai; Xiaoxia Zhang; Zengshou Peng; Jianfeng Li; Zhonghua Ou; Yongzhi Liu
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Paper Abstract

We present a landslide monitoring approach using a high-resolution distributed fiber stress sensor based on polarizationsensitive optical frequency reflectometry (P-OFDR) technology. The sensing system consists of a polarizationmaintaining (PM) fiber and an OFDR with a high spatial resolution. The PM fiber is used as a distributed sensing element. The OFDR is used to measure the polarization mode coupling loss in PM fiber causing by the external pressure along the PM fiber. With the advantages of frequency domain technique and coherent detection, the sensing system can achieve high spatial resolution, high sensitivity and large dynamic range. By monitoring the mechanical property distribution and variations in the landslide body, the occurrence of the landslides can be predicted accurately. We demonstrate an early landslide warning system based on polarization-sensitive distributed fiber stress sensor, which has a spatial resolution of 5cm, dynamic range of about 70dB and theoretical measuring range of 10km. The warning system is also investigated experimentally in the field trial.

Paper Details

Date Published: 12 November 2010
PDF: 6 pages
Proc. SPIE 7844, Semiconductor Lasers and Applications IV, 78440D (12 November 2010); doi: 10.1117/12.873913
Show Author Affiliations
Yong Liu, Univ. of Electronic Science and Technology of China (China)
Zhiyong Dai, Univ. of Electronic Science and Technology of China (China)
Xiaoxia Zhang, Univ. of Electronic Science and Technology of China (China)
Zengshou Peng, Univ. of Electronic Science and Technology of China (China)
Jianfeng Li, Univ. of Electronic Science and Technology of China (China)
Zhonghua Ou, Univ. of Electronic Science and Technology of China (China)
Yongzhi Liu, Univ. of Electronic Science and Technology of China (China)


Published in SPIE Proceedings Vol. 7844:
Semiconductor Lasers and Applications IV
Ning-Hua Zhu; Jinmin Li; Farzin Amzajerdian; Hiroyuki Suzuki, Editor(s)

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