Measuring Solid-Liquid Interface by Ultrasonic Detection for Space Directional Solidification Experiment

A method for solid–liquid interface detection based on ultrasonic pulse echo is proposed considering its application in directional solidification experiments of materials in space. By using ultrasonic generator, sensor, and electronic measurement system, a detection system suitable for space experimental environment is designed. It monitors and analyses the temperature and ultrasonic data of metal materials during solidification. Especially, a method of using an ultrasonic sensor to measure the solid-liquid interface at somewhat high temperature is proposed. By using this method, the position of solid-liquid interface of aluminium sample have been successfully determined.