Design of a Small-Aperture Steering Mirror for High-Bandwidth Acquisition and Tracking.

摘要

The High-Bandwidth Steering Mirror (HBSM) prototype is the product of a research program to develop a high-bandwidth, low angular range, two-dimensional beam steerer used in optomechanical pointing, acquisition, and tracking systems. This research centered around the optimization of a beam-steering mechanism comprising a mirror, restoring flexure, actuators, position sensors, and encompassing housing. Various design trade-offs and manufacturing issues involved in building the prototype are discussed, and the resulting performance data are presented. The resulting HBSM design allows integration with a simple closed-loop control scheme. The mirror/controller has a closed-loop bandwidth of 10kHz, and 1 degree peak-to-peak stroke (mirror normal) at low frequencies. This increased bandwidth yields excellent disturbance rejection in the 10- to 1000-Hz, frequency band and enables the generation of faster scan patterns.