COUPLING ELEMENT OF AN ULTRASONIC TRANSDUCER FOR AN ULTRASONIC, FLOW MEASURING DEVICE
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United States of America Patent
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Issued Date -
Oct 10, 2013
app pub date -
Nov 23, 2011
filing date -
Dec 20, 2010
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Abstract
A coupling element of an ultrasonic transducer suitable for mode conversion of an acoustic longitudinal wave between an in-coupling surface and an out-coupling surface of the coupling element. The coupling element has a first and second interface with a predetermined medium. A first angle between the in-coupling surface and the first interface and a second angle between the first interface and the out-coupling surface are so selected that a transverse waves fraction is reflected on the first interface to the out-coupling surface. The first angle between the in-coupling surface and the first interface and a third angle between the first interface and the second interface are so selected that a longitudinal wave fraction is reflected on the first interface for second interface. A fraction of the longitudinal waves reflected to the second interface is reflected on the second interface back into the coupling element.
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