Design and test of fast steering mirror driven by PZT actuator

ZHANG Limin, WANG Shuai, YANG Fei, QIAO Bing

(Changchun Institute of Optics, Fine Mechanics and Physics, The Chinese Academy of
Sciences, Changchun 130033, China)

Abstract: Aiming at the problems of fine controlling the direction of the beam of light and keeping the stabilization for a telescope,the fast steering mirror(FSM) in the telescope optical system was investigated. After the analysis of parameters of FSM driven by piezoelectric(PZT) actuator affecting its specification, the relationship was established between system specification and structure resonance, resolution, clear aperture and inertia force, etc.. The theory model of basic frequency was established on the basis of Rayleigh energy method, the effectiveness was evaluated on the base of FEA. The 1st resonance, measuring range, uniformity and correction ability were tested. The results indicate that compared with experiment error between theory model and FEA are both smaller than 3%, which indicate that model predigestion in theory is rational and accurate, can act as design reference. The bidirectional uniformity behaves well, tip/tilt range exceeds ±4′, correction accuracy is better than 0.06″. Therefore it can satisfy the application requirement of fine accuracy and fast response even in bad seeing(coherence length 50mm, isoplanatic angle 2″).

Key words: telescope; piezoelectric(PZT); fast steering mirror(FSM); Rayleigh energy method