Adhesive Quality Inspection System Based on Air-Coupled Ultrasonic Waves

Abstract

There has been a lack of in-depth research on plywood quality inspection. There are problems that cannot be detected with current methods due to an insufficiency of inspection methods, low inspection efficiency, and the internal nature of some wood defects. This paper describes the design, software, and experimental verification of a new plywood quality inspection system based on air-coupled ultrasound. An ultrasonic C-scanning platform was designed and constructed. Features selected included a core detection devices, signal excitation module, signal processing module, and motion control module design. The software system design included a host computer interface, C-scanning motion control, MCU excitation signal output, serial communication, ultrasonic C-scanning imaging, as well as interpolation algorithms, etc. The validation test during the inspection of plywood shows that the system was able to realize accurate positioning detection of common plywood defects, such as blisters and plywood seams, and determine the location and shape of plywood defects. The above can provide technical support for the online quality inspection of plywood products, which is of high practical significance.