Abstract
In an airborne electromagnetic system, which transmits time-domain half-sine current waves generated by a resonance circuit, the inductance of the transmitting loop is of great significance and directly related to parameters of the half-sine current waveform. However, in general, the effect of a finite-conducting ground on the inductance of the transmitting loop was neglected, or the ground was handled as a perfect conductor. In other words, there was no accurate method to evaluate ground’s effect on the inductance of the transmitting loop. Therefore, a new and convenient algorithm, calculating ground’s effect on the inductance of a rectangular loop, is proposed in this paper. An experiment was constructed afield, showing that the inductance increased gradually when the loop was lifted up from 0 m to 30 m, which supported the algorithm positively.
Highlights
After the end of World War II, a great demand for natural resources pushed the development of airborne electromagnetic methods (AEM)
Most AEM systems utilize a loop of some turns fixed on the aircraft as the current source [1,2,3]
In the AEM systems which transmit repeated half-sine current waves generated by the series LC resonance circuit, the accurate evaluation of the inductance is important because it decides the transmitting current waveform
Summary
After the end of World War II, a great demand for natural resources pushed the development of airborne electromagnetic methods (AEM). In the AEM systems which transmit repeated half-sine current waves generated by the series LC resonance circuit, the accurate evaluation of the inductance is important because it decides the transmitting current waveform. The inductance of the transmitting loop is measured on the surface of the ground. When the AEM system flies in the sky and works at a distance above the ground, how to precisely evaluate the inductance of the transmitting loop is an unsolved issue. Greenhouse [5] proposed a method to calculate inductance of n-turn square loops. Approximate expressions of inductance of the n-turn square loops are given in [6]. They are only valid in a homogenous medium.
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