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Full-field 3D shape measurement of discontinuous specular objects by direct phase measuring deflectometry

Liu, Yue, Huang, Shujun, Zhang, Zonghua, Gao, Nan, Gao, Feng and Jiang, Xiang (2017) Full-field 3D shape measurement of discontinuous specular objects by direct phase measuring deflectometry. Scientific Reports, 7 (10293). ISSN 2045-2322

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With the advent of intelligent manufacturing, phase measuring deflectometry (PMD) has been widely studied for the measurement of the three-dimensional (3D) shape of specular objects. However, existing PMDs cannot measure objects having discontinuous specular surfaces. This paper presents a new direct PMD (DPMD) method that measures the full-field 3D shape of complicated specular objects. A mathematical model is derived to directly relate an absolute phase map to depth data, instead of the gradient. Two relevant parameters are calibrated using a machine vision-based method. On the basis of the derived model, a full-field 3D measuring system was developed. The accuracy of the system was evaluated using a mirror with known positions along an accurate translating stage. The 3D shape of a monolithic multi-mirror array having multiple specular surfaces was measured. Experimental results show that the proposed DPMD method can obtain the full-field 3D shape of specular objects having isolated and/or discontinuous surfaces accurately and effectively.

Item Type: Article
Uncontrolled Keywords: Imaging and sensing; Optical metrology; Optical sensors
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TS Manufactures
Schools: School of Computing and Engineering > Centre for Precision Technologies
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Depositing User: Feng Gao
Date Deposited: 11 Sep 2017 14:33
Last Modified: 28 Aug 2021 15:37


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