Simple correction method for projection fringe period based on parameter calibration

ZHAO Tingting; BAI Fuzhong; XU Yongxiang; GAO Xiaojuan

doi:10.5768/JAO202142.0103004

Journal of Applied Optics > 2021 > 42(1): 119-124. > DOI: 10.5768/JAO202142.0103004

ZHAO Tingting, BAI Fuzhong, XU Yongxiang, GAO Xiaojuan. Simple correction method for projection fringe period based on parameter calibration[J]. Journal of Applied Optics, 2021, 42(1): 119-124. DOI: 10.5768/JAO202142.0103004

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Simple correction method for projection fringe period based on parameter calibration

College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
Inner Mongolia Key Laboratory of Special Service Intelligent Robotics, Hohhot 010051, China

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Received Date: November 10, 2020
Revised Date: December 06, 2020
Available Online: December 09, 2020

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Abstract

Abstract

In the fringe projection profilometry system based on triangulation principle, the fringe projected on the reference plane always produces the period broaden phenomenon, which can cause phase distortion and even affect the measuring accuracy. The fringe position was taken as the control variable to derive the linear mathematical model of fringe period correction. The model parameters were obtained with a simple and convenient calibration process. Then the new projected fringe was calculated according to the correction model, and the periodic distribution fringe was obtained on the reference plane. The experimental results show that the varying range of the fringe period after correction is within ±0.1 pixel, and this method can obtain the more accurate 3D profile measurement results.

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References

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