Research of fiber Bragg grating geophone based on cantilever beam

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

doi:10.1117/12.835522

24 August 2009 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, International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors; 738116 (2009) https://doi.org/10.1117/12.835522
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

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.

Citation Download Citation

Liang Wang, Shao-hua Chen, Guo Tao, Gui-wu Lu, and Kun Zhao "Research of fiber Bragg grating geophone based on cantilever beam", Proc. SPIE 7381, International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors, 738116 (24 August 2009); https://doi.org/10.1117/12.835522

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KEYWORDS

Fiber Bragg gratings

Sensors

Head

Beryllium

Demodulation

Finite element methods

Optical design

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