Method and apparatus for detecting and measuring inclusions in subsoil

摘要

A method and apparatus is described comprising a transmitter for transmitting an unmodulated carrier of selected wave length into the ground and a receiver adapted to receive reflected signals. Circuitry is described for producing narrow pulses from the transmitted and received signals for displaying them on an oscilloscope and on a plotter. The display on the oscilloscope is rotated through 90° from the conventional display so that the pulses corresponding to the transmitted and reflected signals appear as horizontal bars spaced apart vertically by distances which correspond to the depth of the inclusions below the surface.PPThe wave length is selected to be at least four times the anticipated depth of the inclusions.PPThe apparatus is described as being incorporated into a motor vehicle such as a Land Rover with the transmitting antenna mounted at the front and the receiving antenna at the rear of the vehicle. The apparatus is most conveniently situated in place of the co-driver's seat for operation by an operator sitting in the rear of the vehicle.PP Decoupling between transmitting and receiving antennae is partially achieved due to the rotation through 90° of the polarity of the reflected wave relative to the transmitted wave.