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时间域电磁测深方法中,重叠回线、中心回线和大定源等回线源装置,因其非接地、近场源观测、小装置等优势被广泛应用.但野外观测中,回线布设时由于野外地形条件的限制,往往不能布置成规则形状,回线源的形状对其时间域电磁响应的影响就自然成为一个非常重要因素.作者在文中通过对圆形源、正方形源和正三角形源等回线源的中心点的时间域电磁响应分别按等周长和等面积计算分析,发现任意形状回线源中心点的时间域电磁响应与回线源的形状无关,而是与回线源所包围的面积成正比.并由此推断,任意形状回线源中心点时间域电磁响应观测数据的处理,可以采取等面积圆形回线源的等效处理与解释.
Time-domain electromagnetic sounding methods, such as overlap loop, center loop and fixed source, are widely used because of their advantages of non-grounding, near-field source observation and small devices. However, Due to the limitation of the field topography in layout, it is often not able to be arranged in a regular shape, and the influence of the shape of the loop source on the electromagnetic response in the time domain naturally becomes a very important factor. The time-domain electromagnetic response of the center point of the source line source is calculated by equal perimeter and equal area respectively. It is found that the electromagnetic response in the time domain of the center point of the line source of arbitrary shape has nothing to do with the shape of the return line source, And the area surrounded by the source is proportional to it, and it can be deduced that the processing and observation of electromagnetic response in the time domain of arbitrary shape center line can take the equivalent treatment and interpretation of circular loop source of equal area.