1 December 2009 A novel FBG laser sensor based on beat frequency modulation technology
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Proceedings Volume 7630, Passive Components and Fiber-based Devices VI; 76301N (2009) https://doi.org/10.1117/12.852029
Event: Asia Communications and Photonics, 2009, Shanghai, Shanghai , China
Abstract
We propose and experimentally demonstrate a novel FBG dual-wavelength fiber laser sensor based on the beat frequency demodulation technology. The dual-wavelength beat frequency sensing signal of about 5.224 GHz has been obtained in a photodetector and observed by a radio-frequency spectrum analyzer (RFSA). Furthermore, by employing a LiNbO3 modulator, the high-frequency beating signal can be tuned arbitrarily to tens or hundreds of MHz without distortions. Thus a very cheap and low-frequency RF spectrum analyzer can be used in frequency signal detection. When a strain is applied on the sensor, the beating signal will shift with a stain sensitivity of about (-3.92) kHz/με.
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Liang Zhang, Liang Zhang, Shengchun Liu, Shengchun Liu, Zuowei Yin, Zuowei Yin, Liang Gao, Liang Gao, Xiangfei Chen, Xiangfei Chen, } "A novel FBG laser sensor based on beat frequency modulation technology", Proc. SPIE 7630, Passive Components and Fiber-based Devices VI, 76301N (1 December 2009); doi: 10.1117/12.852029; https://doi.org/10.1117/12.852029
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