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针对大回线源中心装置在回线内场非中心位置处场点响应表达式复杂,视电阻率计算困难,只能套用中心回线装置计算公式,导致解释精度下降问题,给出了圆回线的响应公式。提出对发射回线沿边框进行电偶极子源分解,通过对各个边框的偶极子源产生的响应进行叠加;讨论了圆回线与圆内接多边形发射回线的等效性问题;完成了大回线内任意点的场值计算,并对基于电偶极子近似的大回线内场的分布特征进行了分析,得出了大回线源内非中心点探测的可行性结论。研究成果具有理论价值和实际指导意义。
For the large loop source center device in the return line field non-central position of the field response to the complex expression of the apparent resistivity calculation is difficult, can only apply the center loop calculation formula, resulting in decreased accuracy of interpretation, given the round Line response formula. It is proposed that the electric dipole source decomposition along the border of the transmitting return line be superposed by the superposition of the responses generated by the dipole sources of each border. The equivalence issues between the circular return line and the circular polygon return line are discussed. The calculation of the field at arbitrary point in the large loop and the distribution characteristics of the large loop internal field based on the electric dipole approximation are analyzed. The feasibility conclusion of the non-center point detection in the large loop source is obtained. The research results have theoretical value and practical significance.