26 September 2007 Improving SNR of fiber Bragg grating sensor by digital signal processing
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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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jing Ning, Jing Ning, Shangming Yang, Shangming Yang, Yan Zhang, Yan Zhang, Hong-liang Cui, Hong-liang Cui, } "Improving SNR of fiber Bragg grating sensor by digital signal processing", Proc. SPIE 6713, Nanophotonics and Macrophotonics for Space Environments, 67130O (26 September 2007); doi: 10.1117/12.734438; https://doi.org/10.1117/12.734438


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