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利用物理模型实验,研究了瞬变电磁法对超浅层异常体的探测问题.制作了3套天线装置(重叠回线1、重叠回线2及中心回线),对每一种天线装置分别进行了7个物理模型实验,得到相应的瞬变电磁法多测道剖面图.结果表明:瞬变电磁法响应特征与异常体的尺寸、数量成正比,与异常体的埋深成反比.多匝小回线装置对间距小于边长的两个异常体无法分辨,其分辨率为天线装置边长的2倍.通过改变天线装置尺寸大小及装置类型,瞬变电磁法能对超浅层(小于50cm)异常体进行探测.
The physical model experiment was used to study the detection of ultra-shallow anomaly by the transient electromagnetic method.An array of antenna devices (overlap loop 1, overlap loop 2 and center loop) were fabricated, and each antenna device Seven physical model experiments were conducted and the corresponding multi-track TEM images were obtained. The results show that the response characteristics of transient electromagnetic method are proportional to the size and number of abnormal bodies and inversely proportional to the buried depth of abnormal bodies. Turn small loop device for the two sides of the body is smaller than the length of the two anomalies can not be resolved with a resolution of 2 times the length of the antenna device by changing the size of the antenna device size and type of device, Less than 50cm) abnormal body to detect.