Prof. Liang Wang Profile

Prof. Liang Wang

at China Univ of Petroleum

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Proceedings Article | 24 August 2009 Paper

Research of fiber Bragg grating geophone based on cantilever beam

Liang Wang, Shao-hua Chen, Guo Tao, Gui-wu Lu, Kun Zhao

Proceedings Volume 7381, 738116 (2009) https://doi.org/10.1117/12.835522

KEYWORDS: Fiber Bragg gratings, Sensors, Head, Demodulation, Beryllium, Finite element methods, Optical design, Modulation, Structured optical fibers, Signal attenuation

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Along with the development of seismic exploration, the demand of frequency, dynamic range, precision and resolution ration is increased. However, the traditional geophone has disadvantages of narrower bandwidth, lower dynamic range and resolution, and cannot meet the new needs of seismic exploration. Geophone technology is a choke point, which constrains the development of petroleum prospecting in recent years. Fiber Bragg Grating seism demodulation technology is the newest kind of seism demodulation technology. The sensing probe of the Fiber Bragg Grating geophone is made up of Fiber Bragg Gating. The information which it collects is embodied by wavelength. The modulation-demodulation is accomplished by Fiber Bragg Gating geophone directly. In this paper, we design different size Fiber Bragg Grating geophones based on the transmission properties of Fiber Bragg Grating and cantilever beam method. Beryllium bronze and stainless steel are chosen as the elastic beam and shell materials, respectively. The parameters such as response function and sensitivity are given theoretically. In addition, we have simulated the transmission characteristics of Fiber Bragg Grating geophone by virtue of finite element analysis. The influences of wavelength, mass block, fiber length on the characteristics of geophones are discussed in detail, and finally the appropriate structural parameters are presented.

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