Determination of Direction of Arrival of Seismic Wave by a Single Tri-axial Fiber Optic Geophone  

作　　者：CHANG Tianying CUI Hongliang 

机构地区：[1]College of Instrumentation and Electrical Engineering, Jilin University

出　　处：《Defence Technology（防务技术）》2013年第1期1-10,共10页Defence Technology

基　　金：This project was funded in part bythe U . S . Army

摘　　要：A fiber Bragg grating (FBG) geophone and a surface seismic wave-based algorithm for detecting the direction of arrival (DOA) are described. The operational principle of FBG geophone is introduced and illustrated with systematic experimental data, demonstrating an improved FBG geophone with many advantages over the conventional geophones. An innovative, robust, and simple algorithm is developed for obtaining the bearing information on the seismic events, such as people walking, or vehicles moving. Such DOA estimate is based on the interactions and projections of surface-propagating seismic waves generated by the moving personnel or vehicles with a single tri-axial seismic sensor based on FBGs. Of particular interest is the case when the distance between the source of the seismic wave and the detector is less than or comparable to one wavelength (less than 100 m), corresponding to near-field detection, where an effective method of DOA finding lacks.A fiber Bragg grating （FBG） geophone and a surface seismic wave-based algorithm for detecting the direction of arrival （DOA） are described. The operational principle of FBG geophone is introduced and illustra- ted witb systematic experimental data, demonstrating an improved FBG geophone with many advantages over the conventional geophones. An innovative, robust, and simple algorithm is developed for obtaining the bearing information on the seismic events, such as people walking, or vehicles moving. Such DOA estimate is based on the interactions and projections of surface-propagating seismic waves generated by the moving personnel or vehicles with a single tri-axial seismic sensor based on FBGs. Of particular interest is the case when the dis- tance between the source of the seismic wave and the detector is less than or comparable to one wavelength （less than 100 m）, corresponding to near-field detection, where an effective method of DOA finding lacks.

关 键 词：information processing fiber optic geophone direction of arrival (DOA) tri-axial seismic wave sensing surface seismic wave 

分 类 号：P631.4[天文地球—地质矿产勘探]