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Proceedings Paper

Improving SNR of fiber Bragg grating sensor by digital signal processing
Author(s): Jing Ning; Shangming Yang; Yan Zhang; Hong-liang Cui
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Paper Abstract

Traditionally, the broadband amplified spontaneous emission (ASE) source is considered to be used as the light source for the fiber Bragg grating (FBG) sensing technology. However, this kind of light source has some disadvantages − the huge volume and the high power consumption. These shortages will hamper the development of FBG sensing technology in some kind of applications such as unattended sensor and space environment. In this paper, the authors will present a new approach, the usage of the light emitted diode (LED) as the light source. The LED source is very compact, easy to integrate, and significantly reduced the cost and power consumption. But the light density of LED is so weak that the useful signal is almost buried by noise. A solution proposed by our group is to enhance SNR by digital signal processing (DSP) technology, including high frequency modulation, phase-lock amplifier, encoding on LED and decoding on the synchronistic detection. The experimental results show our effort could significantly increases the signal noise ratio (SNR) and make FBG sensor practical on application.

Paper Details

Date Published: 26 September 2007
PDF: 5 pages
Proc. SPIE 6713, Nanophotonics and Macrophotonics for Space Environments, 67130O (26 September 2007); doi: 10.1117/12.734438
Show Author Affiliations
Jing Ning, Geophysics Institute of China Earthquake Administration (China)
Stevens Institute of Technology (United States)
Shangming Yang, Yantai Univ. (China)
Stevens Institute of Technology (United States)
Yan Zhang, Stevens Institute of Technology (United States)
Hong-liang Cui, Stevens Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6713:
Nanophotonics and Macrophotonics for Space Environments
Edward W. Taylor; David A. Cardimona, Editor(s)

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