DFM Engineering has provided five siderostats mounting 0.5 meter aperture flat
mirrors. These have been used for the JPL/Keck test bed interferometer and have extremely low jitter in
the axis motion and in mirror piston. We have also provided drives for larger systems.
Extremely low jitter
4 degrees per second axes motion
Mirror front surface located precisely at the intersection of the axes
On axis 1 arc second resolution encoders
Computer control system
Coeleostats: A ceoleostat is typically a siderostat, but the word is poorly defined. The name may
also be used to describe a beam director.