Abstract
Background As a full-field optical metrology, projection moire approach has been widely used in many engineering applications. The modeling of moire system and the calibration, including the calibration of relationship between the moire phase and object’s height, and the calibration of optical system parameters, are the key points in this method as they directly determine the measurement accuracy and complexity of operations. Objective In this paper, a projection moire system is established and the axes of the projector and the camera are arbitrary. Methods The moire model is modified based on the idea of iteration to reach a higher precision in describing the topography of the surface. A system calibration method is implemented by adopting a self-calibration approach. Both the projection system and reception system can be parameterized accurately and conveniently, as the error caused by the misalignment of the reference plane and the calibration plate is eliminated. Results The feasibility and accuracy are validated through simulations and experiments. Results show that the proposed methods can reduce the systematic error and simplify the complex of operation effectively. Conclusions By adopting the two methods, the precision and applicability of the established system are greatly improved.
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