Transmission of high-intensity aerial ultrasonic waves by using a straight rigid tube for sound wave transmission

摘要

In this study, we investigated the transmission and irradiation of aerial ultrasonic waves (frequency: 20 kHz) without attenuation. We proposed a method in which sound waves are transmitted by using a rigid tube to irradiate an object without attenuation. In this report, We transmitted and irradiated high-intensity aerial focused ultrasonic waves with a straight rigid acrylic tube. The results showed that the ultrasonic waves were transmitted with a sound pressure peak generated outside the tube when the inner diameter of the tube was approximately the sound wavelength. When the sound waves were transmitted using a tube with an inner diameter of approximately the sound wavelength, the sound pressure at the radiation end was about 80% of the sound pressure at the incident end. These results clarified that our method can transmit aerial ultrasonic waves while maintaining the sound pressure.