抄録
A simple ultrasonic method for measuring the temperature distribution of heated materials is presented. The principle of the method is based on temperature dependence of the velocity of the ultrasonic wave propagating through the material. In this work, a long steel rod whose end surface is being heated, is used as a specimen. Considering the temperature gradient during the heating, five slits are machined at certain locations on the side wall of the steel rod. In order to obtain the temperature distribution along the long axis of the rod, ultrasonic pulse echoes from each slit are measured and the mean velocities of ultrasonic waves propagating through the distance between two slits are calculated. The velocity is then used to determine the mean temperature between the two slits, using a simple relation of the temperature dependence of the velocity of the steel. An experiment with a steel rod of 60 mm length and 10 mm diameter has been performed. The temperature distribution of the rod determined ultrasonically agree well with those obtained using thermocouples and an infrared camera.
