In this paper, a whole-field 3D shape measurement algorithm based on phase-shifting projected fringe profilometry is proposed. The proposed method is different from the conventional stereovision-based algorithms and casts the 3D reconstruction problem into a phase-to-point mapping task. A rigorous phase-to-height mathematical model is derived by considering the practical case of tilt angle in the fringe projection process. The projector in the system is not required to be calibrated like a camera, thus allow the model achieve higher accuracy than conventional stereovision model that requires both camera and projector calibration. The proposed method is evaluated using benchmark 3D points, which are obtained from the camera calibration process. The 3D reconstruction experiment demonstrates that the proposed algorithm performs well and achieves reasonably accuracy.

Annealing twins are synthesised in high purity aluminium processed by dynamic equal channel angular pressing during annealing. Annealing twins and recrystallised grains encircling the twins have specific crystallographic orientation relationships with the deformed matrix grains: approximately 35°–50°<110> for the twins and 30°–45°<100> for the recrystallised grains. Stored energy during dynamic pressing, and the crystallographic orientation between annealing twins and the deformed matrix, strongly affect twin growth during annealing.