Abstract
Infrared phase measuring deflectometry (IR PMD) is a kind of PMD technique, which exploits IR light as a display screen, therefore it can effectively improve the measurement accuracy by reducing the environmental noise, especially the influence of the ambient light. However, data accuracy of a deflectometric measurement system is mainly determined by calibration procedure, which establishes the relationship between phase map and depth data. In this paper, a novel using fringe projection profilometry (FPP) technology based system calibration method is proposed to obtain the geometrical parameters of the IR PMD system. A composite plane calibration board with diffused and specular surface has been designed to determine the X, Y, and Z coordinates of this specular plane at a reference position, which is located at a certain reference position parallel to the ground glass (used as the IR screen) to obtain the system parameter d. Experimental results demonstrate that 3D shape of specular objects can be effectively and accurately measured using the proposed geometrical calibration method.
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