【摘要】 为了脉冲式航空电磁法的应用,本文介绍了均匀大地上空的时间域电磁响应。用傅里叶变换由频率域公式导出了时间域的响应公式。然后以国产脉冲式航电系统的参数计算了二次场的水平分量和垂直分量。根据时间域的计算结果,本文给出了一些解释的图件,可以用来解决两个主要问题。其一是解释在不同飞行高度测得的时间域航空电磁法资料,从而提供大地电阻率;其二是如果给出了大地电阻率,则可计算时间域的航空电磁响应,因此可以校正由飞行高度改变引起的假异常。更多还原

【Abstract】 This paper describes the time-domain electromagnetic response above the surface of a homogeneous earth for the application of the impulse type airborne electromagnetic method. The formulations of the response are developed from the those of the frequence-domain by the Fourier transform. Both the horizontal and the vertical component of the secondary field were computed with the parameters of the home-made impulse type airborne electromagnetic system. According to the computer results of the time-domain, the diagrames of interpretation are presented in this paper. It can be used to solve two major problems. The first is to interpret the time-domain airborne electromagnetic data measured at different flying altitude so that the earth resistivity will be provided. The second is to estimate the time-domain airborne E. M. response, if the earth resistivity is given; therefore the pseudo-anomalies caused by the change of the flying altitude will be corrected.更多还原