The distributed acoustic wave vibration acceleration measurement based on optical wavelet filtering and FBG

Details The distributed acoustic wave vibration acceleration measurement based on optical wavelet filtering and FBG The distributed acoustic wave vibration acceleration measurement based on optical wavelet filtering and FBG

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5634..500l&link_type=abstract

Advanced Sensor Systems and Applications II. Edited by Rao, Yun-Jiang; Kwon, Osuk Y.; Peng, Gang-Ding. Proceedings of the SPIE,

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In this paper, acoustic emission wave vibration acceleration measurement system is presented. In the system the distributed Fiber Bragg grating(FBG) measuring probe is used. In order to fulfill wavefront filtering, space and frequency domain filering, frequency modulation continuous wave (FMCW), wave division multiply (WDM) and time division multiply (TDM) techniques are adopted, and optical wavelet filter is designed. Thus influences of transverse sensitivity, temperature noise and intrinsic noise of fiber can be eliminated automatically, and disturbance of imbalance and nonlinear optical signal can also be restricted efficiently. The system realize distributed measurement of the acoustic emission wave vibration acceleration. The range of measured acceleration is 4.3m/s2~340m/s2, the range of frequency response is quasi-static~1000, the resolution is 7.5x10-7nm/√Hz. The presented measured system is virtually significant theoretically and practically in some fields such as micro-vibration measurement and fault diagnosis of marine platform, large-scale building, concrete dam and satellite launch pad, etc.

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