Image-processing techniques in laser-speckle photography with application to hybrid stress analysis

摘要: Six techniques for analyzing speckle halo fringes fringe spacing and orientation using a digital image analyzer are presented. Each of the were tested range, accuracy, computer run-time through analysis known case rigid-body motion. Application these to two-dimensional hybrid stress is described where speckle-displacement data around high-stress region notched bar in tension used as input plane-stress finite-element program.