Fig. 1. (a) Structural diagram and (b) topology of optical angle measurement system based on interferometric fringe imaging

Fig. 2. Schematic diagram of the effect of a single optical wedge on the beam angle

Fig. 3. Schematic diagram of double grating shear interference

Fig. 4. Distribution of the sub-image spots and the target image spot

Fig. 5. Coordinate offsets errors of the image spots

Fig. 6. Coordinate error of the target image spot

Fig. 7. Phase deviation under different coordinate changes