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Abstract
A double-diaphragm acceleration geophone based on Fiber Bragg Grating (FBG) is proposed and demonstrated experimentally in this paper. The proposed geophone is mainly composed of a FBG, double diaphragms, and an inertial mass. Through theoretical analysis and experimental verification, the FBG acceleration geophone has good comprehensive response characteristics. The experimental results obtained indicate that the flat region sensitivity range is from 651.0 to 850.5 pm/G, the corresponding fluctuation is less than 2.20 dB within 1–70 Hz, the cross sensitivity is less than −16.4 dB, and the quality factor is better than 89.1 nm·Hz/G. Compared with the traditional geophones, the proposed geophone has a higher quality factor. Therefore, this type FBG geophone is very good candidate for low-frequency oil and gas exploration.
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