| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter that hardly generates an unnecessary frequency component of an ultrasonic element and can secure the measurement stability and measurement resolution over a long term. SOLUTION: The frequency characteristic of the ultrasonic element and that of a receiving circuit are made the same. Thus, a received signal output when the ultrasonic element receives ultrasonic wave is amplified, but the other unnecessary frequency component is hardly amplified. Therefore, highly accurate flow measurement can be stably for a long time. COPYRIGHT: (C)2007,JPO&INPIT
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