Digital image correlation (DIC) is an established test technique in several fields including quasi-static displacement measurements. Recently there has been growing interest in using DIC to measure structural dynamic response and even extract modal parameters from that information. While high-speed cameras have become more ubiquitous, there are no commercial end-to-end packages for modal analysis based on image data, particularly when combined with traditional data acquisition systems. As such, the practitioner is left to develop several key data processing capabilities, hardware interface equipment, and testing practices themselves. This work highlights several practical aspects that have been encountered while establishing DIC as a viable modal testing capability in a laboratory environment.

中文翻译：

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数字图像相关作为一种实验模态分析能力

数字图像相关 (DIC) 是包括准静态位移测量在内的多个领域的成熟测试技术。最近，人们对使用 DIC 测量结构动态响应甚至从该信息中提取模态参数越来越感兴趣。虽然高速相机变得越来越普遍，但还没有用于基于图像数据的模态分析的商业端到端软件包，尤其是与传统数据采集系统结合使用时。因此，从业者需要自行开发几个关键的数据处理能力、硬件接口设备和测试实践。这项工作强调了在实验室环境中将 DIC 建立为可行的模态测试能力时遇到的几个实际问题。