| 摘要 |
An ultrasonic flowmeter for measuring the rate of flow of a fluid by means of bursts of ultrasonic drive pulses that are alternately transmitted and received by first and second ultrasonic transducers. A driver circuit is suitably coupled to the first and second transducers to cause the latter to alternately transmit ultrasonic signals in first and second directions through the fluid to be measured. A receiver circuit is coupled to the first and second transducers to cause the latter to alternately receive ultrasonic signals in first and second directions through the fluid to be measured. First and second driver switching means, preferably including tri-state buffers, allow the same driver circuit to drive both transducers. The driver and receiver circuits are directly coupled to the transducers and share a common ground.
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