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论文类型：期刊论文
发表时间：2009-11-01
发表刊物：OPTICS AND LASER TECHNOLOGY
收录刊物：SCIE、EI、Scopus
卷号：41
期号：8
页面范围：985-989
ISSN号：0030-3992
关键字：Photoelastic material fringe constant; Least-squares method; Digital photoelasticity
摘要：A nonlinear least-squares method was applied to determine the photoelastic fringe constant from isochromatic phase field obtained by digital phase-shifting photoelasticity. To perform automatic evaluation, not only the photoelastic fringe constant but the center coordinates of a disk under diametral compression are also determined simultaneously using the nonlinear least-squares method. A set of over-determined nonlinear equations is obtained to estimate the unknown parameters by an iterative procedure based on Newton-Raphson method. Simulation and experimental results show that the parameters are evaluated accurately from the isochromatic phase field obtained from the phase-shifting photoelasticity. The photoelastic fringe constant and the disk center coordinates can be evaluated easily, simply and automatically by the technique. (C) 2009 Elsevier Ltd. All rights reserved.