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Proceedings Paper

Seismic wave detection system based on fiber optic sensor
Author(s): Yan Zhang; Sanguo Li; Jing Ning; Zhifan Yin; Hong-liang Cui
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Paper Abstract

In this paper we will demonstrate our fiber Bragg grating (FBG) accelerometer system in seismic wave detection applications. Optical fiber sensors using fiber Bragg grating have a number of advantages such as immune to electromagnetic interference, lightweight, and low power consumption. Most important, the FBG sensor has high sensitivity to dynamic strain signals and the strain sensitivity can approach sub micro-strain. The basic principle of the FBG seismic sensing system is that it transforms the acceleration of ground motion into the strain signal of the FBG sensor through mechanical design, and after the optical demodulation generates the analog voltage output proportional to the strain changes. The customized FBG seismic sensor prototype is described, which includes the electro-optical design, mechanical design and the hardware and software interface of the sensor system. The laboratory evaluation of the system is performed systematically on a commercial vibration stage. Studies of the sensor properties show that the sensor has a high sensitivity (2500 mV/g at 90 Hz) to the acceleration signal, a large dynamic range (80 dB), the good linearity and stability after device integration and packaging.

Paper Details

Date Published: 7 September 2006
PDF: 8 pages
Proc. SPIE 6296, Earth Observing Systems XI, 62961J (7 September 2006); doi: 10.1117/12.680709
Show Author Affiliations
Yan Zhang, Stevens Institute of Technology (United States)
Sanguo Li, Stevens Institute of Technology (United States)
Jing Ning, Stevens Institute of Technology (United States)
Zhifan Yin, Stevens Institute of Technology (United States)
Hong-liang Cui, Stevens Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6296:
Earth Observing Systems XI
James J. Butler, Editor(s)

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