| 摘要 |
<p>It is desirable that an operation of an oscillator used for measuring propagation time of ultrasonic waves in an ultrasonic flowmeter be an intermittent operation in order to achieve electric power savings. However, pulse stability of the oscillator requires time, so that there is a problem that the intermittent operation cannot be performed. An ultrasonic flowmeter comprising an oscillator 60, and an oscillation start unit 61 for accelerating oscillation of the oscillator, constructed so that a pulse of the oscillator oscillated by the oscillation start unit 61 is used in measurement of propagation time of ultrasonic waves.</p> |
