| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that as a conventional flowmeter varies the amplification degree in order to make a received signal with an amplitude varied by the temperature or flowrate to be in a prescribed level, the power consumption is increased or the measurement precision is lowered because the adjustment of the amplification degree and the measurement thereof are not simultaneously carried out. SOLUTION: This ultrasonic flowmeter comprises a receiving point setting means 21 for setting a receiving point for measuring a propagation time period to a signal from a receiving means 5 and a wave number counting means 22 for counting the number of waves, and a judging means A23. The judging means A23 correlates the receiving point set by the receiving point setting means 21 with the number of waves of the signal from the receiving means 5. COPYRIGHT: (C)2008,JPO&INPIT
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