1.1本文件的目的是帮助潜在用户了解与非接触应变测量系统精度相关的问题，并为光学系统的定量比较提供一个通用框架。非接触式光学应变和变形测量系统的输出通常分为光学数据和图像分析数据。光学数据包含与试样应变相关的信息，图像分析过程将编码的光学信息转换为应变数据。随附文件描述了应变数据中的潜在误差源，并描述了将非接触方法应用于研究光学积分时间远小于编码数据中最大时间频率倒数的事件时，量化误差和估计测量精度的一般方法（即，在积分时间内可以被视为静态的事件）。 附录中给出了该方法的简要应用，以及定义各种术语的具体示例。

1.1 The purpose of this document is to assist potential users in understanding the issues related to the accuracy of non-contacting strain measurement systems and to provide a common framework for quantitative comparison of optical systems. The output from a non-contacting optical strain and deformation measurement system is generally divided into optical data and image analysis data. Optical data contains information related to specimen strains and the image analysis process converts the encoded optical information into strain data. The enclosed document describes potential sources of error in the strain data and describes general methods for quantifying the error and estimating the accuracy of the measurements when applying non-contacting methods to the study of events for which the optical integration time is much smaller than the inverse of the maximum temporal frequency in the encoded data (that is, events that can be regarded as static during the integration time). A brief application of the approach, along with specific examples defining the various terms, is given in the Appendix.