The Impact of Microcomputers on Methods for Holographic Displacement and Strain Analysis
微型计算机对全息位移与应变分析的冲击

The subject of this paper will be the role that microcomputers and image processors can play in the analysis of diplacement and strain in hologram interferom try. The first consideration will be data acquisition, i. e. the process of converting fringes to numerical data that can be used by a computer, Methods will be discussed that range from digitizing tablets to solid-state TV cameras. The next consideration will be proper identification of object points in the image field and the transformation between the image field and mesh points from a finite-element analysis of the object. After this, the problem will be considered of how to interpolate fringes. so as to compute strain or displacements at mesh point locations. Finally, the mathematics for converting holographic data into displacement or strain will be presented.