| 摘要 |
An ultrasonic flowmeter comprising a signal generator for supplying a synchronizing signal to an ultrasonic propagation path and a frequency division time signal to a flow rate computing unit; the flow rate computing unit comprising a time difference detector for determining time difference between a reception time signal from the ultrasonic propagation path and the frequency division time signal from the signal generator, and for generating a signal indicative of which signal is earlier than the other; a sequential approximating means responsive to an output signal form the time difference detector for effecting sequential approximating computation; and a flow rate computing circuit responsive to the output from the sequential approximating means for computing the flow rate of the fluid. The ultrasonic flowmeter is simple, accurate and reliable, and is inexpensive to manufacture.
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