Abstract
An ultrasonic technique for monitoring internal temperature of heated materials such as a metal mold is presented. The principle for measuring temperature inside material is based on temperature dependence of the velocity of the ultrasonic wave propagating through the material. A single side of a steel plate of 30mm thickness is heated up to about 80℃ and ultrasonic pulse-echo measurements are then performed for the steel during heating. A change in the propagation time of ultrasonic wave within the heated steel is monitored and used to determine the temperature and its transition at a certain position inside the steel. The internal temperature determined ultrasonically agrees well with that obtained using a commercial thermocouple installed in the steel.
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