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We propose a new method for a clamp-on ultrasonic flowmeter. A conventional clamp-on ultrasonic flowmeter has a problem that the determination of transit path of ultrasonic waves is complex, because there is a pipe wall on the transit path. In this paper, this problem is studied by a spatial frequency analysis. It is found that the transit path depends on the conditions of incident waves; frequency, incident angle and beam width. It is also found that especially plate mode excitation affects the transit path seriously, and that a wide beam would be very effective in reducing the effect due to the plate mode excitation.

Wide Beam Ultrasonic Flowmeter