| 摘要 |
<p>PROBLEM TO BE SOLVED: To detect a small buried object with good accuracy and safety. SOLUTION: In a sensor A, a plurality of buried rods 12 are attached vertically to a support ring 11, the respective buried rods 12 are buried in the ground, ultrasonic waves are transmitted sequentially from ultrasonic transmitter- receivers 14a, 14b which are attached to the respective buried rods 12, and sound waves are received by ultrasonic transmitter-receivers at the other buried rods. Their received signals are binalized by a signal processor B so as to be stored. At a point of time when the reception of the ultrasonic waves transmitted from all the ultrasonic transmitter-receivers 14a, 14b is finished, their binalized data are luminance-converted, and an image processing operation is executed so as to obtain a three-dimensional image. On the basis of the three-dimensional image, the shape of a buried object is grasped so as to be collated with that of an existing buried object, and the kind of the buried object can be specified.</p> |
