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Proceedings Paper

A flexible, simple telecentric three dimensional measurement system
Author(s): Tong Chen; Jindong Tian; Yong Tian; Jianmei Wu; Dong Li
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Paper Abstract

Calibration which defines the relationship between the phase and depth data is the important part of the fringe projection profilometry. In practice, the inherently nonlinear and spatially variable relationship between the absolute phase of the projected fringe and the object surface depth without using telecentric lens make calibration problematic in the measurement of small object. In order to obtain this problem, a flexible, simple telecentric three dimensional measurement system is proposed. Because of the characteristic that the size of object will not change with depth in telecentric imaging, the absolute phase is linear with the depth and the process of calibration become simpler. The experiment result indicate that the standard deviation of calibration result at z coordinate is within 5 μm, while that at x and y coordinate is within 3 μm. Three-dimensional shape reconstruction of a coin value ¥1 and measurement of central circle points of the calibration target further verify the validity of the proposed calibration method.

Paper Details

Date Published: 26 June 2017
PDF: 9 pages
Proc. SPIE 10330, Modeling Aspects in Optical Metrology VI, 103300H (26 June 2017); doi: 10.1117/12.2270126
Show Author Affiliations
Tong Chen, Shenzhen Univ. (China)
Jindong Tian, Shenzhen Univ. (China)
Yong Tian, Shenzhen Univ. (China)
Tianjin Univ. (China)
Jianmei Wu, Shenzhen Univ. (China)
Dong Li, Shenzhen Univ. (China)

Published in SPIE Proceedings Vol. 10330:
Modeling Aspects in Optical Metrology VI
Bernd Bodermann; Karsten Frenner; Richard M. Silver, Editor(s)

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