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Proceedings Paper

Rock mass acoustic emission detection using DFB fiber lasers
Author(s): Wenzhu Huang; Huaixiang Ma; Wentao Zhang; Fang Li; Yanliang Du
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Paper Abstract

A systematic study of rock mass acoustic emission (AE) detection using distributed feedback (DFB) fiber grating lasers is presented. In this, a minimum detectable strain of 10-12 is achieved in the experiment when using a fiber optic interferometric demodulation. The dynamic strain sensitivity of DFB fiber grating laser in different coupled modes is calibrated by a comparison with PZT AE sensor.. The acoustic emission directional characteristics of the DFB fiber grating laser are investigated by two kinds of analyzing method. In the first experiment, the relationship between the wavelength drift and the angle of a continuous acoustic emission source is determined. In the second experiment, the relationship between the percentage of wavelet packet energy and the angle of the impact response is established. Their acoustic emission directional characteristics make them suitable for determining principal strains and the direction of propagation of acoustic waves. Because of these advantages, the DFB fiber lasers will provide a practical and advanced measurement means in large civil structural health monitoring.

Paper Details

Date Published: 30 November 2012
PDF: 8 pages
Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 856104 (30 November 2012); doi: 10.1117/12.999771
Show Author Affiliations
Wenzhu Huang, Institute of Semiconductors (China)
Shijiazhuang Tiedao Univ. (China)
Huaixiang Ma, Shijiazhuang Tiedao Univ. (China)
Wentao Zhang, Institute of Semiconductors (China)
Fang Li, Institute of Semiconductors (China)
Yanliang Du, Shijiazhuang Tiedao Univ. (China)

Published in SPIE Proceedings Vol. 8561:
Advanced Sensor Systems and Applications V
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan, Editor(s)

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