Fig. 1. Structural diagram of two-dimensional gimbal mount rotatory axes

Fig. 2. Optical system in internal laser head

Fig. 3. Diagram of proper alignment error

Fig. 4. Diagram of squareness error

Fig. 5. Different surface error of axes

Fig. 6. Cone angle error of vertical rotatory axes

Fig. 7. Laser spot orbit on the surface of reference sphere

Fig. 8. Variation of laser beam position caused by run-out error perpendicular to the direction of the laser beam

Fig. 9. Transmission path of the laser beam reflected by reference sphere

Fig. 10. Position and attitude variations of laser beam caused by run-out error

Fig. 11. Variation of laser beam position caused by run-out error along the direction of laser beam

Fig. 12. Simplified model of optical system of laser tracing measurement

Fig. 13. Diagram of experimental setup

Fig. 14. Relationship between run-out error of axes and laser measurement error. (a) Positive direction; (b) negative direction