New instrument for continuous recording of changes in ultrasonic velocity compatible with automatic attenuation measurements

Publisher Website
Google Scholar
Abstract
A new method has been developed for continuous recording of changes in ultrasonic velocity. The system is consistent with classical equipment for automatic attenuation measurements (working by the pulse echo technique). This is based on phase comparison measurement between two ultrasonic pulses, one travelling through the sample tested and one through a reference sample. The phase comparison is made with high speed logic circuits after adequate shaping of the RF pulses. The resolution thus obtained is about 1 ns for frequencies up to 10 MHz. A description of the major functions of the system is given. Some typical results are reported for dislocation studies in aluminium.
Keywords

This publication has 4 references indexed in Scilit: