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为了进一步满足精细探测的需要,给出了一种大回线源瞬变电磁全域视电阻率数值计算方法,利用该方法可以快速求取大回线源非中心点处多分量的全域视电阻率.利用贝塞尔函数展开法计算大回线源非中心点垂直分量与水平分量的电磁响应,通过分析非中心点处的多分量电磁响应特征,得到基于磁感应强度的大回线源全域(时间上不分早晚,距离上不分远近)视电阻率计算方法.与现有全区视电阻率方法不同在于:对非中心点处多分量视电阻率进行定义,利用磁感应强度定义不存在假极值现象,无需迭代,计算速度快,精度高.
In order to further meet the needs of fine detection, a method of numerical calculation of total apparent resistivity of large loop source transient electromagnetic field is given. By using this method, the global apparent resistivity of multi-component at the non-central point of large loop source The electromagnetic response of the vertical component and the horizontal component of the non-central point of the large loop is calculated by using the Bessel function expansion method. By analyzing the multi-component electromagnetic response characteristics at the non-central point, the large-loop source region based on the magnetic flux density On both morning and evening, the distance is not far and near) apparent resistivity calculation method with the existing method of apparent resistivity is different: non-central point of multi-component apparent resistivity is defined, the use of magnetic induction intensity definition does not exist false Value phenomenon, without iteration, calculation speed, high precision.