在水平层状均匀介质的表面,采用单极～偶极装置所测的视电阻率ρ_1可表示(参见文献[1],P.4,式(4),本文仍用该文的符号)为若R_1(m)=R_1(m)-1则上式变成式中ρ_1为第一层的电阻率,r为电极至电源的距离,m为空间频率的积分变量,J_1为一阶贝塞尔函数,R_1(m)是空间频率特性函数。空间频率特性函数R_1(m)可用如下的递推公式表示(参见文献[1],P.6,式 (13)) The apparent resistivity ρ_1 measured by a monopole-dipole device can be expressed on the surface of a horizontally layered homogeneous medium (see references [1], p.4 and equation (4) If R_1 (m) = R_1 (m) -1 then the above formula becomes where p_1 is the resistivity of the first layer, r is the electrode-to-power distance, m is the spatial frequency integral variable, J_1 is the first order Bessel R 1 (m) is a function of spatial frequency. The spatial frequency characteristic function R_1 (m) can be expressed by the following recursion formula (see [1], P.6, equation (13))