Models of the interaction of the electromagnetic field of mobile systems of low-frequency inductive electrical exploration and conducting ferromagnetic bodies

Abstract

The subject of the article is a review of the author's proposed dynamic models of the interaction of the
primary electromagnetic harmonic field of mobile electromagnetic exploratory systems and the
secondary (eddy current) field of a conducting body with ferromagnetic properties and proposals for
new applications of such and similar systems.These models make it possible to theoretically substantiate
the shape of the signal from a ferromagnetic body. A signal of this form was often observed by moving
systems in practice, but it had no theoretical explanation and was therefore not used. The purpose of the
review is to acquaint the wider scientific community with the new possibilities of mobile electromagnetic
exploratory systems. In particular, this is the ability of mobile electromagnetic exploratory systems to
detect conductive bodies not only with diamagnetic properties, but also with ferromagnetic ones in the
ground and water, based on appropriate signals. This expands the area of application of mobile
electromagnetic exploratory systems and allows to create of other mobile systems for a new purpose. It
is theoretically shown that the signal from bodies with ferromagnetic properties is similar in shape to
one period of a sinusoid. The amplitude of the signal is proportional to the speed of movement of technical
means relative to the body and the frequency of the harmonic field. The transition from one half-period
to another takes place at the moment when the moving system passes the point closest to the body.
Conclusions.The scientific novelty of the obtained results is as follows.A review of the developed
theoretical justifications of the waveform from bodies with ferromagnetic properties for moving systems
with the measurement of both point phase characteristics and characteristics averaged over the area are
carried out.It was proposed to use well-known aerial electromagnetic exploratory systems for a new
purpose, as well as new mobile systems for searching conductive bodies in the areas of road and railway
overpasses, agricultural fields and in water depths.