Active optics is the key technology in the researching of large-scale telescope,and the active optics system,consisted of wavefront sensor,computer control system,calibration element and force actuator,is a closed-loop control system for correcting the wavefount error.Because the main error resources are system errors that caused by optics processing,machining,assembly,calibration,and telescope deformation resulting from the change of gravity and temperature gradient,the calibration frequency is about 10-2 Hz.However,the calibration frequency must reach 10 Hz if it is needed to correct the atmospheric disturbance around the main mirror and the error caused by wind.
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