Abstract
Results are presented on the development of curved reflecting surfaces for use in an ultrasonic transit time flowmeter for high speed gas flow measurement. These surfaces were designed to reduce the effects of ultrasonic beam sweep which occur at high (subsonic) flowrates. They reflect the swept ultrasonic beam so as to redirect it towards the receiving transducer. Basic analysis of the effect of the flow on the reflection of beam are included and differential equations for three reflection profiles based on different assumptions about this effect are presented. Numerical techniques used in the solution of these equations are discussed. The effect of the profiles on the ultrasonic transit time is analysed. The design of a reflective ramp based on one of these profiles is presented, and experimental measurements are provided showing an increased meter range without a detectable loss of accuracy.
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