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早在50年代初期,在加拿大、瑞典等国就开始用航空电磁法来普查金属矿了。二十多年来,技术上经过多次改进,航空电法逐渐成熟,现已成为一种通用的有效找矿工具,航空电法有许多变种,除本文介绍的时域的航空电磁法外,其它航空电磁法都是频率域的。它们的一般工作方法是利用装在飞机上的发射线框,人工连续地发出一种或多种音频的电磁波作为场源(也有利用天然音频电磁场或甚低烦电台发出的电磁波),用装在同一飞机上的或拖在机尾的吊舱中的接收线框来探测地下矿体所产生的二次场。因为发射的波形是连续的,所以需要在有一次场存在的情况下
As early as the early 1950s, airborne electromagnetic surveys began in Canada, Sweden and other countries. Over the past 20 years, many improvements have been made in technology and aeronautical electrification has gradually become mature. Now it has become a versatile and effective tool for prospecting. There are many variants of the aeronautical method. In addition to the time-domain aeronautical electromagnetism method introduced in this article, Other aeronautical methods are in the frequency domain. Their general method of work is the use of a transmitting wireframe mounted on an aircraft to manually and continuously emit electromagnetic waves of one or more frequencies as field sources (also using electromagnetic waves originating from natural audio electromagnetic fields or very annoying radio stations) Receiving wireframes on the same aircraft or in towed pods to detect secondary fields generated by underground ore bodies. Because the transmitted waveform is continuous, it is necessary to have a field present