MEASUREMENT OF DISTANCE BETWEEN INNER WALLS OF PIT

摘要

PURPOSE:To make automatic measurement of distance between inner walls of a pit available by a method wherein ultrasonic signals are emitted several times from an ultrasonic sensor provided in the pit and the received data are stored in a memory, and a distance corresponding to a peak point detected out of summed-up data is obtained. CONSTITUTION:An ultrasonic sensor 2 is hung down into stabilizing fluid in a pit 1 and ultrasonic signals are emitted (n) times to inner walls 2a, 2b of the pit from the sensor at a measuring position in a depth where the sensor is positioned, and reflected signals are received therewith. The received data are then amplified with an amplifier 7 in a reception recorder 6. Amplified analog data are then transmitted to the reception recorder 6 and are recorded on recording paper and are also transmitted to an analog-digital converter 8 and are written into a RAM. The received data in (n) by number are transferred to a CPU and are summed up with each of front positions of the data aligned on an axis of time. A peak point is detected out of the summed-up data with the data preceding a basic range eliminated, and distance data are displayed and recorded after correction is made.