Abstract
We have proposed a new ultrasonic method for measuring internal temperature distribution of heated materials. The principle of the method is based on temperature dependence of the velocity of the ultrasonic wave propagating through the material. An inverse analysis to determine one-dimensional temperature distribution in a heated plate is developed and its validity is verified using a numerical model. In order to demonstrate the practical feasibility of the developed method, a single side of a steel plate of 30 mm thickness is heated by hot water and ultrasonic pulse-echo measurements are then performed for the steel during heating. The propagation time of ultrasonic wave in the heated steel is precisely monitored and used to determine the temperature distribution of the steel. The internal temperature distributions determined ultrasonically agree well with those obtained using thermocouples installed in the steel.
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