Comparison of Camera Calibration and Measurement Accuracy Techniques for Phase Measuring Deflectometry

Phase measuring deflectometry (PMD) is a competitive method for specular surface measurement that offers the advantages of a high dynamic range, non-contact process, and full field measurement; furthermore, it can also achieve high accuracy. Camera calibration is a crucial step for PMD. As a result,...

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Autores principales:	Renhao Ge, Dahai Li, Xinwei Zhang, Ruiyang Wang, Wanxing Zheng, Xiaowei Li, Wuxiang Zhao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	phase measuring deflectometry entrance pupil center camera calibration surface shape Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/878ebff8753d4f8f8f0fbeb90aec9e07
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spelling	oai:doaj.org-article:878ebff8753d4f8f8f0fbeb90aec9e072021-11-11T15:19:49ZComparison of Camera Calibration and Measurement Accuracy Techniques for Phase Measuring Deflectometry10.3390/app1121103002076-3417https://doaj.org/article/878ebff8753d4f8f8f0fbeb90aec9e072021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10300https://doaj.org/toc/2076-3417Phase measuring deflectometry (PMD) is a competitive method for specular surface measurement that offers the advantages of a high dynamic range, non-contact process, and full field measurement; furthermore, it can also achieve high accuracy. Camera calibration is a crucial step for PMD. As a result, a method based on the calibration of the entrance pupil center is introduced in this paper. Then, our proposed approach is compared with the most popular photogrammetric method based on Zhang’s technique (PM) and Huang’s modal phase measuring deflectometry (MPMD). The calibration procedures of these three methods are described, and the measurement errors introduced by the perturbations of degrees of freedom in the PMD system are analyzed using a ray tracing technique. In the experiment, a planar window glass and an optical planar element are separately measured, and the measurement results of the use of the three methods are compared. The experimental results for the optical planar element (removing the first 6 terms of the Zernike polynomial) show that our method’s measurement accuracy reached 13.71 nm RMS and 80.50 nm PV, which is comparable to accuracy values for the interferometer.Renhao GeDahai LiXinwei ZhangRuiyang WangWanxing ZhengXiaowei LiWuxiang ZhaoMDPI AGarticlephase measuring deflectometryentrance pupil centercamera calibrationsurface shapeTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10300, p 10300 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	phase measuring deflectometry entrance pupil center camera calibration surface shape Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	phase measuring deflectometry entrance pupil center camera calibration surface shape Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Renhao Ge Dahai Li Xinwei Zhang Ruiyang Wang Wanxing Zheng Xiaowei Li Wuxiang Zhao Comparison of Camera Calibration and Measurement Accuracy Techniques for Phase Measuring Deflectometry
description	Phase measuring deflectometry (PMD) is a competitive method for specular surface measurement that offers the advantages of a high dynamic range, non-contact process, and full field measurement; furthermore, it can also achieve high accuracy. Camera calibration is a crucial step for PMD. As a result, a method based on the calibration of the entrance pupil center is introduced in this paper. Then, our proposed approach is compared with the most popular photogrammetric method based on Zhang’s technique (PM) and Huang’s modal phase measuring deflectometry (MPMD). The calibration procedures of these three methods are described, and the measurement errors introduced by the perturbations of degrees of freedom in the PMD system are analyzed using a ray tracing technique. In the experiment, a planar window glass and an optical planar element are separately measured, and the measurement results of the use of the three methods are compared. The experimental results for the optical planar element (removing the first 6 terms of the Zernike polynomial) show that our method’s measurement accuracy reached 13.71 nm RMS and 80.50 nm PV, which is comparable to accuracy values for the interferometer.
format	article
author	Renhao Ge Dahai Li Xinwei Zhang Ruiyang Wang Wanxing Zheng Xiaowei Li Wuxiang Zhao
author_facet	Renhao Ge Dahai Li Xinwei Zhang Ruiyang Wang Wanxing Zheng Xiaowei Li Wuxiang Zhao
author_sort	Renhao Ge
title	Comparison of Camera Calibration and Measurement Accuracy Techniques for Phase Measuring Deflectometry
title_short	Comparison of Camera Calibration and Measurement Accuracy Techniques for Phase Measuring Deflectometry
title_full	Comparison of Camera Calibration and Measurement Accuracy Techniques for Phase Measuring Deflectometry
title_fullStr	Comparison of Camera Calibration and Measurement Accuracy Techniques for Phase Measuring Deflectometry
title_full_unstemmed	Comparison of Camera Calibration and Measurement Accuracy Techniques for Phase Measuring Deflectometry
title_sort	comparison of camera calibration and measurement accuracy techniques for phase measuring deflectometry
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/878ebff8753d4f8f8f0fbeb90aec9e07
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Comparison of Camera Calibration and Measurement Accuracy Techniques for Phase Measuring Deflectometry

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