C-scan imaging in molten zinc by focused ultrasonic waves

摘要

Ultrasonic images of a small steel object immersed in molten zinc at 600℃ are obtained with high spatial resolution using a focused ultrasonic pulse-echo technique. The focused ultrasonic waves are generated by a spherical acoustic lens which has been machined at the probing end of a clad buffer rod. The backscattered echoes from the object surface have a signal-to-noise ratio of 35 dB at 10 MHz in molten zinc. The ability to provide high spatial resolution measurements in molten metal is demonstrated by comparing the results obtained in molten zinc with those obtained in water.