Methodology: we take a 30 minute dark dome exposure with a standardized setup
(g1 s2.0 GG385) to assess the presence of residual light in the dome environment.
A test case is shown above. The background scattered light was about 3 e/hr.
There were three traces of scattered light. A small green LED trace seen at
lower left, which was found to be due to the SAMS mirror controllers under the
primary. The mirror controller LEDs have since
been taped over. A faint 9000A IR LED trace in the center
right was found to be caused by the fiber optic communications connected
to the moving baffle viewing camera, now discontinued.
The origin of the red LED trace near the middle has yet to be identified.
Last updated: Sun, 08 Jan 2012 03:03:19 -0600 caldwell