Mr. Zhongzhu Yang Profile

Zhongzhu Yang

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Proceedings Article | 29 August 2013 Paper

High sensitivity fiber optic accelerometer based on folding F-P cavity

Zhong-zhu Yang, Hong Luo, Shui-dong Xiong

Proceedings Volume 8914, 891411 (2013) https://doi.org/10.1117/12.2034550

KEYWORDS: Fiber optics, Fiber optics sensors, Optical fibers, Reflectivity, Mirrors, Sensors, Reflection, Collimators, GRIN lenses, Fabry–Perot interferometers

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The mutual restriction relationship between the acceleration sensitivity and the resonant frequency blocked the improvement of the performance of the common fiber optic F-P accelerometer. A new type of optic fiber accelerometer based on the folding F-P cavity was introduced in this article. The phase changes caused by a certain acceleration signal are amplified through the multiple reflections of the light in the F-P cavity. Since the optical structure has no effects on the resonance frequency of the system, the acceleration sensitivity can be improved while the resonance frequency remains unchanged. The theoretical sensitivity and resonant frequency are analyzed. A collimator lens with the gradient index fiber is used to reduce the losses of the longitudinal displacement in the F-P cavity. The results show that the improvement of the sensitivity is directly proportional to the times of reflections of the light in the cavity. The theoretical sensitivity can reach 26~30dB 30dB while the resonant frequency of the accelerometer is kept at 800Hz

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