An Ultrasonic System for Detecting Channel Defects in Flexible Packages

Ultrasonic system was developed for detecting channel defects embedded in bonded 2-sheet flexible packages film. This hardware system consisted of spherically focused 22.66-MHz ultrasonic transducer, four-axis precision positioning system, NI PXI-bus embedded controller and ultrasonic pulser-receiver. The software system was designed based on the modularization, realized the echo signal on-line processing using ultrasonic backscattered echo envelope integral (BEEI) imaging method. Some experimental results were presented, and the BEEI-mode imaging of channel defect was shown. The system can be easily used to detect the channel defects in flexible packages.