|
Problem: Vignetting/Occulting
Manifestation(s):
-
WFS pupil image not fully illuminated.
-
Sometimes only manifests at certain on-sky positions
e.g. HA: -1.0, Dec: -47 (2022-07-10);
HA: +2.0, Dec: +48 (2022-06-20).
Solution/Recovery:
-
In POCO User Interface GUI: Verify dome shutter position is
coincident with telescope top-end ring.
-
In ShaneAO motor control GUI: Insert calibration stage
(Cal X = White Light,
Cal Y = White Light).
In ShaneAO Power Controls GUI: Activate White Light
(outlet [B8]).
If White Light source is vignetted, then obstruction is downstream
of the calibration stage in the beam path.
Conversely, if White Light source is not vignetted,
then obstruction is upstream of the calibration stage in the beam path.
In ShaneAO Power Controls GUI: Dectivate White Light
(outlet [B8]).
In ShaneAO motor control GUI: Wthdraw calibration stage
(Cal X = White Light,
Cal Y = Open).
Visit enclosure: Verify dome shutter position is
coincident with telescope top-end ring.
-
Visit instrument: Inspect for unrestrained loose cables or components
that may potentially swing loose into beam path.
Cause(s):
-
Dome occulting telescope top-end ring.
-
Unrestrained component / cable / fiber in beam path.
Reference(s):
-
Trouble report(s): 12991.
Modification(s):
-
2022-07-12: First version.
-
|