The demand for plywood products for the interior and exterior construction has grown significantly over the years. Therefore, detection of defects present in the plywood is of prime importance to maintain good quality of construction. In this study, qualitative and quantitative analyses of defects in plywood using digital holographic interferometric technique are presented. In this process, thermal and mechanical loads are applied to the test sample of plywood to generate interferometric fringes by comparing the normal and stressed states of the test sample. A portable digital holographic camera developed for non-destructive testing applications is employed for detection of cracks, delamination, edge defects, and layer opening in the plywood. The defects in the plywood sample are identified by observing discontinuities in the interferometric fringes. Quantitative analysis of defects is performed by plotting their 2-D and 3-D phase profiles from the digital holographic interferometric results. The obtained results of defects on plywood are validated by a mechanical profiler.

多年来，对用于内部和外部建筑的胶合板产品的需求已显着增长。因此，检测胶合板中存在的缺陷对于保持良好的施工质量至关重要。在这项研究中，提出了使用数字全息干涉技术对胶合板中的缺陷进行定性和定量分析。在此过程中，将热负荷和机械负荷施加到胶合板的测试样品上，以通过比较测试样品的正常状态和应力状态来生成干涉条纹。为非破坏性测试应用开发的便携式数字全息相机用于检测胶合板上的裂纹，分层，边缘缺陷和层开口。通过观察干涉条纹的不连续性来识别胶合板样品中的缺陷。缺陷的定量分析是通过从数字全息干涉测量结果中绘制出它们的2-D和3-D相图来进行的。胶合板上缺陷的获得结果通过机械轮廓仪进行了验证。