A novel FBG laser sensor based on beat frequency modulation technology

Liang Zhang; Shengchun Liu; Zuowei Yin; Liang Gao; Xiangfei Chen

doi:10.1117/12.852029

1 December 2009 A novel FBG laser sensor based on beat frequency modulation technology

Liang Zhang, Shengchun Liu, Zuowei Yin, Liang Gao, Xiangfei Chen

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.

Citation Download Citation

Liang Zhang, Shengchun Liu, Zuowei Yin, Liang Gao, and 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); https://doi.org/10.1117/12.852029

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