Temporal speckle method for measuring three-dimensional surface of large-sized rough glass

Chao Li; Changhe Zhou; Shaoqing Wang; Xin Fan; Boquan Yang; Yancong Lu; Hao Li; Zhao Liu

doi:10.1117/12.2246077

31 October 2016 Temporal speckle method for measuring three-dimensional surface of large-sized rough glass

Chao Li, Changhe Zhou, Shaoqing Wang, Xin Fan, Boquan Yang, Yancong Lu, Hao Li, Zhao Liu

Proceedings Volume 10022, Holography, Diffractive Optics, and Applications VII; 100220N (2016) https://doi.org/10.1117/12.2246077
Event: SPIE/COS Photonics Asia, 2016, Beijing, China

Abstract

To provide accurate three-dimensional (3-D) data for production and processing, 3-D surface measurement is always an essential step to the production of glass. Profilometry and Interferometry are traditional measurement apparatus, referring to different procedures. Although more precise, Interferometry cannot be used in milling procedure, owing to the scattering property of rough glass. While as a widely used Profilometry, Coordinate Measuring Machine (CMM) employs a probe for measuring by contacting surface directly. It should be noted that such a time-consuming machine is not practical for measuring large-sized rough glass, so a novel designed method called temporal speckle is introduced to a non-contact binocular 3-D measurement system for measuring. Specifically, N band-limited binary patterns are sequentially projected to rough glass from a pattern generation device, such patterns have been proved to depress scattering properties of rough surface. The whole binocular 3-D measurement system can finish a single measurement in one second with a standard deviation less than 73.44um. This system performs fast and accurate 3-D surface measurement for large-sized rough glass block.

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Chao Li, Changhe Zhou, Shaoqing Wang, Xin Fan, Boquan Yang, Yancong Lu, Hao Li, and Zhao Liu "Temporal speckle method for measuring three-dimensional surface of large-sized rough glass", Proc. SPIE 10022, Holography, Diffractive Optics, and Applications VII, 100220N (31 October 2016); https://doi.org/10.1117/12.2246077

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KEYWORDS

Glasses

Cameras

3D metrology

Binary data

Digital Light Processing

Speckle

Scattering

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