A Vibration Sensor Based on Fiber Bragg Grating Fabry-Perot Cavity

Zhen-long, 成振龙 Cheng; Jianlin, 赵建林 Zhao; Wang-min, 周王民 Zhou; Quan-chao, 吕全超 L; Zi-jun, 潘子军 Pan; Fan, Fan

doi:10.3788/gzxb20103901.0047

Cited by 1 publication

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“…It needs to measure the reflected wavelength of FBG for getting vibration information, so it is important to research dynamic wavelength demodulation of FBG. Because the systems are too complex, the dynamic wavelength demodulated methods based on Mach-Zehnder, Michelson, and Sagnac interferometer are not suitable for a distributed application [2][3][4][5] . Although the method of wavelength scanning is easy to implement distributed FBG sensing, but due to the limited scan rate, it is difficult to achieve a higher frequency measurement [6,7] .…”

Section: Introductionmentioning

confidence: 99%

Design of distributed FBG vibration measuring system based on Fabry-Perot tunable filter

Zhang

Miao

Li³

et al. 2011

SPIE Proceedings

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A distributed optical fiber grating wavelength interrogator based on fiber Fabry Perot tunable filter(FFP-TF) was proposed, which could measure dynamic strain or vibration of multi-sensing fiber gratings in one optical fiber by time division way. The wavelength demodulated mathematical model was built, the formulas of system output voltage and sensitivity were deduced and the method of finding static operating point was determined. The wavelength drifting characteristic of FFP-TF was discussed when the center wavelength of FFP-TF was set on the static operating point. A wavelength locking method was proposed by introducing a high-frequency driving voltage signal. A demodulated system was established based on Labview and its demodulated wavelength dynamic range is 290pm in theory. In experiment, by digital filtering applied to the system output data, 100Hz and 250Hz vibration signals were measured. The experiment results proved the feasibility of the demodulated method.

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Section: Introductionmentioning

confidence: 99%