Elimination of car's magnetic effect as noise in a car-borne magnetic exploration system

차량 자력탐사에서 차량의 영향의 제거

A blank test was done to calculatee the car itself's magnetic effect as noise and to eliminate it from the data set of total magnetic intensity(=magnetic flux density) exploration in a car-borne magnetic exploration system. To calculate the induced magnetic intensity(= magnetization) and the remanent magnetic intensity(= magnetization) of the car itself, we have installed the magnetometer on a fixed point and measured the magnetic intensity letting the car move around the magnetometer, and we have changed the data set into an analogous data set as if acquired in the condition that we have parked the car on the same fixed point and measured the magnetic intensity moving the magnetometer around the magnetometer. Through an inversion with the later data set as input, we have calculated the magnetic center and the magnetic moments of the induced magnetic intensity(= magnetization) and the remanent magnetic intensity(= magnetization) of the car itself with the two centers coincided because of some barriers of the inversion algorithm that we have used in this study. On the other hand, we have extracted the magnetic anomaly by reducing i. e. vectorially eliminating the induced magnetic intensity(= magnetization) and the remanent magnetic intensity(= magnetization) of the car itself calculated forwardly, from the magnetic exploration data set acquired by the car-borne magnetic exploration system.

차량이 자력계를 끌면서 자기장을 측정하는 자력탐사시스템에서 차량 자체가 발생하는 잡음으로서의 자기장을 제거하기 위한 실험을 하였다. 차량 자체의 잔류자기 및 유도자기를 추출하기 위하여, 먼저 자력계를 고정된 점에 두고 차량을 이동하면서 자기장을 측정하였고, 이 자료로부터 차량을 고정된 점에 두고 자력계를 이동하면서 측정한 자료로 만들었으며, 후자의 자료로부터 역산을 통하여 차량 자체의 잔류자기 및 유도자기를 계산하였다. 한편, 차량 자력탐사시스템으로 측정한 각 측점의 자료로부터, 역산으로부터 계산한 차량 자체의 잔류자기 및 유도자기에 의해 발생하는 잡음으로서의 영향을 벡터적으로 제거 즉, 보정하여 자력이상을 추출하였다.