8.3 AO coordinate systems

8.3.3 Calibration issues


The (XIM,YIM) coordinate system has its origin on the rotator axis. If this axis moves for any reason then all calibrated (XIM,YIM) positions will have to be adjusted.

Similarly, the orientation of the (XIM,YIM) coordinate system is defined by the orientation of the acquisition camera. If the acquisition camera is rotated for any reason then all calibrated (XIM,YIM) positions will have to be adjusted.

We live with these annoyances for the DCS but we tend to have a rather small number of calibrated positions. For AO, it may be worthwhile allowing for a small offset of the rotator axis (two parameters) and a small rotation of the reference detector (one parameter) and correct these parameters in the event of re-mounting of a reference component. Will there be some absolute reference on the optical bench?


AO Software Design Book - 25 FEB 1997

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