Abstract
We developed a new technique for linearly converging ultrasonic waves radiated by a rectangular stripe-mode vibrating plate. In conventional sources of ultrasonic waves, emission direction converters are used to linearly converge ultrasonic waves radiated by vibrating plates. However, the emission direction converters had such complicated constructions that they had problems such as the difficulty of manufacturing and maintaining them. The converging technique proposed by us uses a concept different from the conventional one, and therefore it has the significant features that the reflectors used have a much simpler structure and a better characteristic of converging ultrasonic waves than the conventional ones. We experimentally manufactured an ultrasonic source at 50 kHz, and confirmed that it could realize the formation of a linearly converged high-intensity sound field having the same length as the vibrating plate.
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