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 method using a finite difference model has been developed to determine one-dimensional temperature distribution in a heated plate. To demonstrate the practical feasibility of the developed method, a steel plate of 30mm thickness is heated by contacting with molten aluminum at 700℃ and ultrasonic pulse-echo measurements are then performed for the steel during heating. The internal temperature distribution and its transit variation determined ultrasonically agree well with those obtained using thermocouples installed in the steel.
