Development of the Phased Array Ultrasound System for Nondestructive Testing and its Key Techniques

摘要

The aim of this paper is to discuss the key techniques of the phased array ultrasound testing system for nondestructive testing. A set of phased array ultrasound system was built up for our study. The working mechanism of the system and the system architecture are illustrated in this paper. The design strategy of the ultrasound array element, the phase controlling technique, the analog and digital signal processing and the ultrasound imaging are emphatically introduced. Preliminary test shows that ultrasound phased array system has better signal-noise ratio, more sensitive to defects, wider testing range and higher working efficiency than conventional single element ultrasound NDT testing system.