Sonde Method of Measuring the Ultrasonic Field Intensity

抄録

A new sonde method of measuring the field intensity of ultrasonics was devised. The sonde is made of a small ball (about 2 mm in diameter) of sound-absorbing material, in which a thermistor of much smaller dimension is included in its centre. From experimental results and theoretical considerations, two noteworthy facts are derived. They are “surface heat generation” (on the surface of any solid material heat is generated in ultra sonic field) and the cooling effect of ultrasonic wave.