Fig. 1. Secondary mirror adjustment mechanism

Fig. 2. Principle of the secondary mirror focusing mechanism

Fig. 3. Installation and adjustment of secondary mirror assembly

Fig. 4. High precision linear actuator assembly

Fig. 5. LVDT linear differential sensor assembly

Fig. 6. Split nut fits with threaded guide rod

Fig. 7. Adjustment mechanism accuracy test

Fig. 8. Adjustment range

Fig. 9. Inclination deviation of secondary mirror

Fig. 10. Eccentricity of secondary mirror

Fig. 11. Adjustment step of the secondary mirror