F-P geophone medium

A method of broadening frequency bandwidth and improving sensitivity of a Fabry-Pérot (F-P) geophone is proposed, and the corresponding high-performance device is designed and demonstrated experimentally. The theoretical model of F-P geophone based on wavelength demodulation is established thoughtfully, and while the sensitivity is effectively improved, the frequency band can be effectively extended under the determined higher resonance frequency, and the cross-sensitivity can be suppressed. Based on this design idea, the structure of the F-P cavity geophone filled with sensitizing medium is cleverly designed. The corresponding geophone is fabricated.

提出了一种拓宽法布里-珀罗（F-P）地震仪频带宽度并提升其灵敏度的方法，并设计并实验验证了相应的高性能设备。基于波长解调的理论模型经过精心构建，在有效提升灵敏度的同时，可在确定的更高共振频率下有效扩展频带，并抑制交叉灵敏度。基于此设计理念，巧妙地设计了填充传感介质的F-P谐振腔地震仪结构，并相应地制造了地震仪。