The Development and Testing of a Borehole Radar Prototype
A prototype of borehole radar has been successfully developed and tested in three sites for different purposes under a field condition.The objective of this development is for providing an effective downhole tool for detecting targets in deep boreholes situated in a relatively high conductivity area such as the metal ores.This prototype is an experimental system baseed by a vector network analyzer.It can be operated for either single-hole reflection mode or cross-hole transmission mode.The radio frequency (RF) signal transmisson between the network analyzer and the down-hole antennas is accomplished by the optical cable;therefore the signals loss is negligible.The first testing site is at a geothermal field.The fractures extended more than 20 m from the borehole are delineated by the borehole radar in single-hole reflection mode.The second testing site is located in a jade mine for basement evaluation.The cross-hole measurement mode was used to detect the cavities made by previous unorganized mining activities.Several high-velocity anomalies were found in the velocity profile and presumably the targets of the mine shafts and tunnels.The third test site is located in a mineralized belt,the surface-borehole measurement was carried out,and the data was processed with velocity tomography.The low-velocity zone is corresponding to a mineralized zone from geological records.The three testing results proved the readiness of this borehole radar prototype for further deployment in more complicated and realistic field situations.
Borehole radar prototype single-hole reflection cross-hole measurement velocity
Sixin Liu Junjun Wu Hang Dong Lei Fu Fei Wang
College of Geo-exploration Science & Technology, Jilin University College of Geo-exploration Science & Technology, Jilin University;Northeast Institute of Geography a
国际会议
长沙
英文
324-331
2012-06-15（万方平台首次上网日期，不代表论文的发表时间）