Development and Application of Dry-Coupled Acoustic Detection Technology for Composites

This paper comprehensively analyzed the following five dry coupling acoustic detection technologies for composites, the dry pressure coupling, the acoustic impedance, local percussion method, air coupled ultrasonic testing method and the pitch catch. Descriptions were made on their basic principle, their technical features, limitations and application objects. The development trends of composite dry coupling technology were prospected in the final part of the paper.