The Space Dynamics Laboratory has combined internal funds with its background in space-rated mechanisms to develop
a prototype low-cost large-angle 2-axis fine steering mirror (FSM). The FSM has a 75-mm clear aperture, 30-degree
mechanical elevation angle, 120-degree mechanical azimuth angle, and a 70-Hertz small-amplitude bandwidth. Key
components include a rotary voice coil, unique patent-pending feedback sensor, brushless DC motor and optical encoder.
Average error is <1 arcsec and total mechanical mass is <1 kg. Additional accomplishments include a passive launch
lock, launch vibration testing, portable demonstration electronics development, and thermal-vacuum testing to pressures
down to 1e-7 torr and temperatures down to 164 K.