電子工作キットで学ぶ超音波の力学的作用

抄録

Acoustic levitation is one of interesting effects of ultrasound. Small particles are suspended in the nodes of a standing wave generated between an ultrasonic transducer and a reflector. The author developed an ultrasonic device with a commercially-available electronic hobby kit, which can be also developed in school and home. This device radiates sufficiently intense ultrasound to levitate small particles to visualize the periodic structure of ultrasonic standing waves. It is small and light, and children can handle it. They can freely insert/remove levitated particles, transfer them by moving the ultrasonic device, visually observing the ultrasonic standing wave. This experience excites their interest in ultrasound and encourages their motivation for further study.