レーザスペックル法に画像処理を援用した金属材料の損傷の検出 : 第2報,表面性状とレーザスペックル輝度分布の関係

概要

論文の詳細を見る
In this paper we investigate a method to measure plastic strain of metals with no contact using the laser speckle method. This method is based on observation of the change in laser speckle pattern depending on surface profile change occurring due to plastic deformation. The analysis of the laser speckle pattern is performed using an image-processing system. The relationships between speckle pattern and surface roughness or frequency characteristics of the surface profile were investigated in this study. Surface roughness and surface profile were observed for steel specimens polished with emery papers or plastically deformed. The surface profile diagram was analyzed by means of the Fast Fourier Transform with a computer and the distribution of frequency was obtained. The results show that distribution of light intensity of the speckle is related to frequency distribution of the surface profile, but the distribution of the laser speckle is not always related to surface roughness. It was also clarified that the laser speckle pattern is closely related to the magnitude of plastic strain.
一般社団法人日本機械学会の論文
1993-05-25