Optimization of shape measurement system based on spatial light modulators
Optimization of shape measurement system based on spatial light modulators
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DOI：
10.1117/1.602340
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发表时间：
2000
影响因子：
1.3
通讯作者：
C. R. Coggrave;J. M. Huntley
中科院分区：
文献类型：
--
作者：
C. R. Coggrave;J. M. Huntley
我们描述的实验研究的结果，以优化的全场形状测量系统的测量精度的基础上产生的空间光调制器（SLM）的投影条纹。研究的问题包括：（1）不同相移算法（4帧、7帧和15帧）的相对性能;（2）不同时间相位展开算法（特别是逆指数和傅里叶变换测距方法）的相对性能;以及（3）投影仪散焦的影响。最后一点被证明是一个关键的限制因素，在这样的系统的性能。由于SLM的像素结构，将投影仪聚焦在测量体积内会产生具有高系统噪声含量的数据，而将投影仪聚焦在测量体积之外很长的距离会由于减少的条纹调制而引入显著的随机噪声。在最佳焦点位置，测量精度可达到1/20，000视场。© 2000 Society of Photo-Optical
We describe the results of an experimental study to optimize the measurement precision of a whole-field shape measurement system based on projected fringes produced by a spatial light modulator (SLM). Investigated issues include (1) the relative performance of different phase-shifting algorithms (4 frame, 7 frame, and 15 frame);(2) the relative performance of different temporal phase unwrapping algorithms (in particular, the reversed exponential and Fourier transform ranging methods); and (3) the effect of projector defocus. The last point is shown to be a crucial limiting factor in the performance of such systems. Focusing the projector within the measurement volume produces data with high systematic noise content due to the pixel structure of the SLM, whereas focusing the projector a long way beyond the measurement volume introduces significant random noise due to the reduced fringe modulation. At the optimum focal position, a measurement precision of better than 1 part in 20,000 of the field of view is achieved.© 2000 Society of Photo-Optical