摘要
电磁探测技术是工程和环境地球物理勘查中最有效的技术之一 ,近年来频率域和时间域电磁探测仪器不断发展 ,涌现出适用于地下管线探测、地下水污染监测、堤坝质量检测、土壤特性探测与评价的新型电磁探测仪器。频率域电磁探测仪器采用了传导电流和位移电流都不能忽略的频段以及位流发射技术 ;时间域电磁探测仪器向甚早期偏移 ,以弥补传统电磁法和探地雷达难以探测的盲区 ,提高探测的分辨率与探测效率。在美国爱得荷国家工程实验室 (IdahoNationalEngi neeringLaboratory)进行的电磁探测综合演示实验 (EMID)反映出当今电磁探测仪器的水平和发展趋势。
Being one of the effective geophysical investigation techniques in engineering and environment,electromagnetic (EM) survey has been well developed in these years. New EM instruments have been continually introduced into underground tube detection, underground water pollution monitoring and subsurface building detection and evaluation. With the purpose of filling in the blank area where the traditional EM methods and the ground penetrating radar (GPR) can not be applied effectively, frequency domain electromagnetic (FEM) instruments make use of frequency bands, in which the diffusion and displacement currents cannot be ignored, and the bit stream transmit technique. Time domain electromagnetic (TEM) instruments are shifted to the very early time of the off time electromagnetic responses. The detection resolution and efficiency can be improved by the new EM instruments. The electromagnetic integrated demonstration (EMID) at the Idaho National Engineering Laboratory Cold Test Pit in USA shows the present status and development trend of the modern EM instrumentation.
出处
《物探与化探》
CAS
CSCD
2000年第3期165-177,共13页
Geophysical and Geochemical Exploration
基金
国土资源部百名跨世纪人才基金资助
关键词
电磁探测仪器
工程监测
环境监测
电磁探测技术
electromagnetic instruments
engineering and environmental geophysics
FEM and TEM
development review
