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Proceedings Paper

A novel FBG laser sensor based on beat frequency modulation technology
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Paper 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.

Paper Details

Date Published: 1 December 2009
PDF: 6 pages
Proc. SPIE 7630, Passive Components and Fiber-based Devices VI, 76301N (1 December 2009); doi: 10.1117/12.852029
Show Author Affiliations
Liang Zhang, Nanjing Univ. (China)
Shengchun Liu, Institute of Fiber Optics, Heilongjiang Univ. (China)
Nanjing Univ. (China)
Zuowei Yin, Nanjing Univ. (China)
Liang Gao, Nanjing Univ. (China)
Xiangfei Chen, Nanjing Univ. (China)

Published in SPIE Proceedings Vol. 7630:
Passive Components and Fiber-based Devices VI
Perry P. Shum, Editor(s)

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