| 摘要 |
PURPOSE:To rapidly and remotely measure the sonic velocity of an object to be measured and the change thereof through a contact member for a transmitter.receiver with high accuracy, by alternately changing over and connecting the transmitting circuit part and receiving circuit part of the ultrasonic transmitter.receiver if necessary. CONSTITUTION:A duplexer part 10 alternately changes over and connects a transmitting circuit part 11 and a receiving circuit part 12 if necessary with respect to ultrasonic transmitter.receivers 3, 4 for measuring sonic velocity. A main control part 30 connects a signal selection means 13A, a timing means 13 for measuring the arrival time of the receiving signal passed through the means 13A and a signal processing part performing predetermined operation on the basis of the time data outputted from the means 13 to measure the sonic velocity of a medium to be measured to the receiving circuit part 12 and controls the driving of these parts with the same timing. Further, the control part 30 has the first control function for calculating the phase speed of the ultrasonic wave in the contact part of the transmitter.receivers 3, 4 at the time of measurement, the second control function for calculating the group speed of the ultrasonic wave of the contact part and the third control function for operating the sonic velocity of the medium to be measured to make it possible to remotely measure the sonic velocity of the medium to be measured with high accuracy.
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