| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce a processing load of a wall filter for removing a standing wave in an ultrasonic flowmeter. <P>SOLUTION: This ultrasonic flowmeter is equipped with: a transducer for transmitting an ultrasonic signal to a fluid in a pipe, and receiving its reflection signal as a reception signal; an AD conversion part for converting the reception signal into digital data; the wall filter for removing a standing wave component from a digitized reception signal; and a flow velocity operation part for operating flow velocity of the fluid, based on the reception signal from which the standing wave component is removed. The wall filter performs smoothing processing to a plurality of reception signals in each data of a corresponding time series to extract the standing wave component, and pulls out the standing wave component extracted from the reception signal, to thereby remove the standing wave component from the reception signal. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
