The basic study of ultrasound characteristics and velocimetry in molten glass

High temperature measurement system is presented. This system employs the ultrasonic buffer rod and pulsed Doppler method. The buffer rod has a cooling jacket to use the high efficiency room temperature transducer. For considering ultrasonic velocimetry method in the molten borosilicate glass, the temperature dependency of sound velocity at the temperature of 1000degC to 1200degC is obtained using cross-correlation technique, and its difference is within plus-minus 5%. A numerical simulation is also applied to design the optimised buffer rod, and its result shows good agreement with an experiment. Using this technique, the velocity, especially the speed of relative moving wall is obtained, and its error is within plus-minus 4% when a value remained in measurable velocity. (author)