ULTRASONIC FLOWMETER

摘要

Disclosed is an ultrasonic flowmeter which automatically corrects, without actually having a fluid flow, the difference between the actual size of measurement flow channel (1) and a flow channel size for calculating the flow volume, said flow channel size being set in control unit (4). The ultrasonic flowmeter is provided with, for example: a pair of ultrasonic vibrators (2, 7) which can transmit and receive ultrasonic signals; propagation time measuring unit (5), which measures the propagation time required for ultrasonic vibrator (7) to receive the ultrasonic signals transmitted from ultrasonic vibrator (2); control unit (4), which obtains a flow volume from the propagation time; received waveform amplitude measuring unit (9), which measures the amplitude of the waveform received by ultrasonic vibrator (7); and measuring flow channel size correcting unit (11), which corrects the size of the measurement flow channel on the basis of the difference between the amplitude and the amplitude of the specified received waveform. Thus, the difference between the actual size of measurement flow channel (1), and the size set for measuring flow channel (1) in the control unit (4) for calculating the flow volume can be corrected.