2017_EJRNL_PP_XIAOPING_HE_1.pdf
Terbatas  
» Gedung UPT Perpustakaan
Terbatas  
» Gedung UPT Perpustakaan
In this paper, based on the expression of the relativemagnetic anomaly for a frequency-domain magnetic dipole
in homogeneous half-space under quasi-static conditions, we derive higher-order approximate formulas of the
apparent conductivity. At the same time, it is found that there is a translational and expansionary characteristic
between the response curve of the relative magnetic anomaly for the frequency-domain magnetic dipole and
underground conductivity and observation frequency. Accordingly, we propose a translation algorithm that
can directly calculate the apparent conductivity. By processing the data of the theoretical models and the
GEM-2 electromagnetic measurement data from the detection of the thickness of Arctic sea ice, we validate
the effectiveness of this method. In comparison with the conventional and the higher-order approximate
calculation formula of the apparent conductivity, this method features fast computation speed, high accuracy,
and insensitivity to the instrument height. Meanwhile, it also helps explain the burial depth of the conductive
layer. Therefore, it is worth popularizing and applying in practical applications.