Abstract When working with the method of projected fringes outside the optical laboratory one often encounters the problem of uncontrollable ambient light. This might cause saturation of the camera which in turn results in clipping of the fringes. Since standard theories describing phase-shifting techniques assume the projected fringes to be purely sinusoidal, such clipping will result in measurement error. In this paper a detailed analysis of this problem is given, and relations between phase errors, the amount of fringe clipping and the number of phase steps are found. Moreover, the phase difference between the clipped and the unclipped fringes is described. This investigation is based on Fourier- and phasor analysis.

中文翻译：

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使用投影条纹的表面形貌测量中削波波形的相位误差分析

摘要 在光学实验室外使用投影条纹方法时，经常会遇到环境光不可控的问题。这可能会导致相机饱和，进而导致条纹被剪掉。由于描述相移技术的标准理论假设投影条纹是纯正弦的，这种削波会导致测量误差。本文对该问题进行了详细的分析，找出了相位误差、条纹裁剪量和相位步数之间的关系。此外，还描述了剪裁和未剪裁条纹之间的相位差。该调查基于傅立叶和相量分析。