Optical axis stabilization technology based on FSM on a vehicle platform

In order to meet application requirements of optical axis stabilization on a vehicle platform, compositions of the optical axis stabilization system were introduced and selection requirements of the driver of a fast steering mirror (FSM) were analyzed. With piezoelectric ceramics actuators as the drivers for the FSM, modal analysis and mechanical simulation of the FSM were carried out and the structure design was optimized. Using the position of centroid detected by high frequency camera as feedback signal, high speed image processing was made with field-programmable gate array, and a FSM for optical axis stabilization based on vehicle platform was developed. Performance parameters of the FSM were tested. After integration test, it is found that the resolution is about 0.4μrad and the bandwidth of the closed loop is more than 100Hz. With the car running at 40km/h on a three-level road, with the FSM controlled by the central computer in unattended mode, the root-mean-square jitters on x and y axes of the closed loop decreases 3.6 and 2.1 times of that of the open loop respectively. The suppression effect of optical axis jitter within 20Hz is obvious and preferable test result is obtained. The system has characteristics of high bandwidth, high accuracy and high stability, and plays an important role in the optical axis stabilization on a vehicle platform.