f The TEM arbitrary impulse equipment

Introduction Transient electromagnetic (TEM) sounding is an important method for environmental investigation and engineering geophysics. The similar existing TEM techniques proved to have, along with many advantages, numerous essential limitations, such as: -difficulties in studying the upper part of the section close to the surface; this is because only the late stage of transient process is interpretable; -inapplicability of many statistical methods for noisy data processing because of logarithmic time-step used and only accumulated data registered; -poor spectrum of common used signal (turning on/off of current). In this paper we describe an equipment for measuring and a method for interpreting the nearsurface TEM data. This method is based on using the arbitrary fully controlled current impulse. All soundings are registered separately with arithmetic time step. It is shown, that with technique suggested, one can overcome the above pointed difficulties.