APPARATUS AND METHOD FOR INVESTIGATING POSITION OF BOUNDARY SURFACE OF HORIZONTAL STRATA OF SOIL

摘要

PURPOSE:To easily and accurately estimate the position of the boundary surfaces of horizontal strata of soil by extracting a curve high in correlation as the reflected wave from the boundary surfaces of horizontal strata of soil and extracting the calculated change point of a section dielectric constant. CONSTITUTION:A pulse wave having wide-band frequency is generated from a pulse generator 1 to be transmitted to a transmission antenna 2. The electromagnetic wave sent out as a result is reflected from the boundary surfaces BD1, BD2 of horizontal strata of soil and the other unnecessary reflecting body NN. The reflected waves are received by a receiving antenna 3 while the receiving antenna 3 is allowed to run and the interval between the transmission antenna 2 and the receiving antenna 3 is changed by a definite distance. Next, the received reflected waves are sampled and only inflection points are extracted by an extraction circuit 4. The extracted inflection points are constituted as a plurality of point groups by an operation part 5 and the change point of a section dielectric constant is determined as the boundary surfaces of the horizontal strata of soil to be displayed on a dummy cross section display part 6.