光纤布拉格光栅地震检波器的实验研究  

The experimentation of fiber Bragg grating geophone

作　　者：罗小东[1] 乔学光[1] 贾振安[1] 邵敏[1] 冯德全[1] 

机构地区：[1]西安石油大学光电油气测井与检测教育部重点实验室,西安710065

出　　处：《地球物理学进展》2012年第3期1202-1206,共5页Progress in Geophysics

基　　金：自然科学基金资助项目(60727004);国家"863"计划资助项目(2009AA06Z203);西安石油大学青年创新基金项目(Z06044)联合资助

摘　　要：光纤布拉格光栅(FBG)是一种新型的传感元件,具有分辨率高、精度高、抗电磁干扰能力强、频带宽等优点.本文以光纤布拉格光栅为敏感元件,设计并制作了一种地震检波器,建立了地震检波器的力学模型,并推导出地震检波器固有频率和灵敏度的理论公式.理论分析了影响地震检波器动态特性的因素,并进行实验对该FBG地震检波器的性能进行研究,实验结果表明:该FBG地震检波器在5～55Hz的振动频率范围内,具有良好的线性响应,而且输出稳定、灵敏度高,适用于地震勘探.Fiber Bragg grating （FBG） is a new type sensor, it has high resolution, wide bandwidth, high accuracy and fine immunity to electromagnetic interference. A novel geophone based on FBG is designed and produced in this paper. The mechanic model of the FBG geophone is established, the important parameters such as natural frequency and acceleration sensitivity of the FBG geophone are deduced. Through theoretical analysis, some factors which affect dynamic characteristics of the FBG geophone are found, and performance of the FBG geophone is studied by experiment. The experimental results show that the FBG geophone has the advantages of good linear response, stable output and high sensitivity at 5Hz to 55 Hz,and can be used for seismic prospecting.

关 键 词：地震检波器 光纤布拉格光栅(FBG) 灵敏度 

分 类 号：P631[天文地球—地质矿产勘探]