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24 July 2018 Spatial color-encoded phase-shifting technique for phase measuring deflectometry
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Proceedings Volume 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018); 1082721 (2018) https://doi.org/10.1117/12.2500564
Event: Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 2018, Shanghai, China
Abstract
Free-form optics has been attracted huge interest since it can significantly improve the performance of an optical system with a simpler structure. However, optical testing for free-form surfaces is usually more difficult compared with traditional ones. Although a variety of interferometers can achieve measurements with nanometer-scale precision, it suffers from the problems of a complex system configuration, a limited measurement range and relatively high requirements of testing conditions, etc. In contrast, phase measuring deflectometry (PMD) which has the benefits of a simple system structure, a large dynamic range and a high measurement accuracy is gradually becoming a powerful tool for free-form surface testing. Nevertheless, multiple groups of fringe patterns are required to sequentially display in two orthogonal directions to obtain the corresponding surface gradients in the classical PMD measurement. Therefore, a speedy detection of free-form surfaces is generally blocked. To overcome the above shortcoming, a spatial color-encoded phase-shifting strategy is put forward for PMD to acquire absolute phases with only four color images in this paper. Experimental results demonstrate the effectiveness of the proposed method as well.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Suodong Ma, Guojun Lu, Fang Dai, Chunmei Zeng, and Hua Shen "Spatial color-encoded phase-shifting technique for phase measuring deflectometry", Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 1082721 (24 July 2018); https://doi.org/10.1117/12.2500564
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