Widebeam ultrasonic flowmeter

A novel method of a clamp-on ultrasonic flowmeter is proposed. With this method, a widebeam is examined theoretically by the application of spatial frequency analysis. It is demonstrated that plate modes generated in a pipe wall exert bad effects on flowrate measurement. This method can reduce such effects. This method makes it possible to automatically compensate for the deviation of the transit path caused by the temperature change, and to measure the flowrate even if the sound velocity is unknown.<<ETX>>