A Novel In Situ Calibration Method Based on Virtual Planes for Fringe Projection Profilometry

The phase 3D coordinate mapping (P3DM) is an efficient 3D reconstruction method for the in-situ measurement. However, the conventional P3DM calibration method requires complex operation or an extra high-precision positioner stage, which is not suitable for the in-situ calibration. A novel in-situ calibration method for P3DM is proposed based on virtual planes. A series of virtual planes are generated and the relationship between the artificial 3D coordinates and the phases on each virtual plane by pixel is established. The proposed method only needs to capture the calibration board patterns at top and bottom positions to overcome the space limitation and reduce personal measurement error, so to achieve a high accuracy, simple and low-cost in-situ calibration. A small field-of-view (FoV) measurement system is developed with the usage of the proposed calibration method. The experimental results show that the measurement error with a standard deviation of 1.9μm is obtained. The feasibility of the proposed method is verified by a successful application to a relay component assembly line.