Current Status and General Comments:
Hardware - LEDs:
There are three sets of LEDs, of which only two are currently used:
1) is used for CaOs, Tpoint and Starguider
3) is used for AMC
1) One set of LEDs is situated under the lid of the PMT camera.
The LEDs are arranged on a circle (radius ≈ 69 cm) around
the camera center. They can be dimmed with a remote control, which has
to be powered to maintain the brightness of the LEDs.
This set of LEDs is not only used by the Camera Oscillation Monitor,
but also for the Pointing Camera to take datasets for the Pointing
Model (tpoint) and for the
Starguider to take starguider data.
To switch on the LEDs one has to switch on the power of the LEDs and
the curtain motor in the camera
control cabinet. There's a
switch in the upper left of the
camera control cabinet. To
switch the power on put the button to the very left.
To adjust the brightness of the LEDs the
remote control has to be
powered. One can power it with batteries, but they are empty very fast.
So better connect the remote control with a
normal power supply(12 V).
To have a uniform brightness do NOT switch off the remote control during
To dim the LEDs to the needed brightness there's a
tuning knob on the right upper side of
the remote control. The whole range of brightness can be dimmed in 40
2) A second set of LEDs is situated around the PMT-Camera (radius
≈ 140 cm). The LEDs are mounted in small boxes at aluminum
arms at the camera frame. This LEDs are in the same circuit like the
AMC-LEDs (4 Leds on the camera lid). They can be switched on in the
gui of the central or the camera control. These LEDs are not in use.
3) The third set of LEDs is for the AMC. It is situated on the
camera lid and consists of 4 LEDs. This 4 LEDs are in the same circuit
like the LEDs of 2). They can be switched on in the gui of the central
or the camera control.
Hardware - video camera(s):
For the Camera Oscillation Monitor a standard video camera
is mounted in a central position in the dish.
In total there are 3 videocameras mounted in the dish at the moment:
1) AMC-Camera: not very sensitive videocamera; FOV: PMT camera plane, the 4
LEDs at the corners of the pictures; this video camera is plugged to
2) Pointing Camera: very sensitive camera looking to the PMT camera;
FOV: inner part of the PMT camera; plugged to PC4
The sensitivity of this camera is very high and such it has also a high
noise. But with interpolating some seconds one can get very good
3) CaOs Camera: sensitive camera looking to the PMT camera; same FOV
like Poining Camera; plugged to PC4
4) Starguider Camera: FOV: half of the camera and part of the sky
Pointing and Starguider camera are both plugged to PC4. In the Starguider
Software it is possible to switch between this two cameras.
The Caos-Software is so far included in the Starguider-Software:
To get the functionalities of the Camera Oscillation Monitor one has to
switch on the CaOs-Filter in the Software:
-> Display -> Caos-Filter
Then it is possible to:
- print the positions of the LEDs to the terminal
-> CaOs -> Print -> Leds
- print the radius of the ring and the coordinates of the center of
the ring to the terminal.
-> CaOs -> Print -> Rings
- write the LED information into a rootfile for an offline analysis
-> CaOs -> Write -> Start/Stop
- do an online analysis (doing this the programm still hangs
-> CaOs -> Anaylse -> Start/Stop Analyse
To get a good resolution in time, as many pictures as possible should
Therefor it's best to switch off the interpolation of several pictures
(-> Setup -> Disp. Interpolation -> Off).
At the moment this might be not possible as pc4 is still in the
Wuerzburg container and the pictures are broadcasted. If the net is too
crowded this might cause problems with the drive system. In this case
try interpolation of 2 (or if this still causes problems, 5) pictures.
(-> Setup -> Disp. Interpolation -> 2/5)
any questions or remarks?
mailto: Daniela Dorner