Abstract
This study focuses on the ultrasonic propagation along the wedge length of the wall in a straight waveguide designed to reduce the minimum detection distance of an ultrasonic sensor for distance measurement. Wedges are created on the waveguide wall to avoid ultrasound interference caused by reflection on a smooth wall, and the wedge dimensions must be chosen carefully. The magnitude of the ultrasonic signal was evaluated according to the wedge length in terms of the ratio of the target reflection to the exit reflection while maintaining the wedge angle selected in the previous study. The propagation of ultrasonic waves was studied using finite element analysis. The wedge length that maximizes the magnitude of the ultrasonic signal was found to be similar to the wavelength. It was possible to reduce unwanted reflection and increase target reflection by adjusting the waveguide wall wedge length.
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