Universal, Automatic, and Accurate Interferogram Analysis for Optics-based Experimental Mechanics and Its Open Source Implementation

基于光学的实验力学的通用、自动和精确的干涉图分析及其开源实现摘要基于光学的技术在实验力学领域占主导地位，产生干涉图或条纹图案，必须对其进行分析以获得全场力学描述。本研究的目的是探索一种通用、自动、精确的光学实验力学干涉图分析工具，将计算机工程领域的开源理念应用到实验力学领域的干涉图分析中。这项研究涉及探索两种技术。通用小波变换技术在检测干涉图局部特征时对各种误差不敏感，可以自动准确地从单个干涉图中确定相位及其梯度。通用相移技术可以科普所有的实际问题，为多幅相移干涉图提供准确、快速和自动化的分析。这项研究还涉及开发一个相应的开放源码软件包/工具，通过一个基于论坛的互联网平台提供给技术界。这使得研究人员能够共享、维护和改进这一重要工具，从而大大提高基于光学的实验力学的能力，并为相关的分析和计算建模工作提供急需的工具。精确的全场试验力学描述对先进工程结构的设计和分析具有重要意义。该软件工具允许研究人员，实验人员或非实验人员，轻松进行许多基于光学的实验力学测量。研究与教育相结合的目的是提高学生的背景和能力，使其具有更广泛的跨学科知识，其中包括扩大代表性不足的群体的参与。

Universal, Automatic, and Accurate Interferogram Analysis for Optics-based Experimental Mechanics and Its Open Source ImplementationAbstractOptics-based techniques, which are dominant in experimental mechanics field, produce interferograms or fringe patterns that must be analyzed to obtain whole-field mechanics descriptions. The objective of the research is to explore a universal, automatic, and accurate interferogram analysis tool for optics-based experimental mechanics, and apply the concept of open source from computer engineering field to the interferogram analysis in experimental mechanics field. The research involves exploring two techniques. The universal wavelet transform technique, which is insensitive to various errors when detecting the local characteristics of an interferogram, can automatically and accurately determine phases and their gradients from a single interferogram. The universal phase shifting technique can cope with all the practical problems and provide accurate, fast, and automatic analysis for multiple phase-shifted interferograms. The research also involves developing a corresponding open-source software package/tool, which is to be available to the technical communities through a forum-based Internet platform. This allows researchers to share, maintain, and improve the important tool together.The research would greatly enhance the capabilities of optics-based experimental mechanics, and provide a much-needed tool to support the relevant efforts in analytical and computational modeling. It has far-reaching significance for the design and analysis of advanced engineering structures where accurate whole-field experimental mechanics description is important and critical. The software tool allows researchers, experimentalists or non-experimentalists, to conduct many optics-based experimental mechanics measurements easily. The integration of research with education aims to enhance backgrounds and abilities of students with broader interdisciplinary knowledge, and it includes broadening the participation of underrepresented groups.