3-Dimensional Angular Measurement Method Based on Moiré Fringe

Traditional system which uses moire fringe to detect object rotation angle can not reflect the change of multidimensional angles at the same time. In order to solve this problem, a new experiment system is constructed by adopting combined grating and optic auto-collimation imaging technology. In this combined gratings, different gratings are designed in partitioned interzone. The system can detect 3-dimensional angle by measuring the change of moire fringe. The measurement accuracy for the cooperative plane mirror rotation in 2D is less than 1″, and the rotation around its axis is less than 2″.