Re: ROB is running

[Tom Droege <tdroege2@earthlink.net>]

Yep, I just mention things like this since every so often someone comes 
back and says "Oh! Yes! this is the well known (in my narrow circle) 
foo-bar effect."

There is a big gradient, a few thousand counts, and a big offset, possibly 
10,000 counts.

It does not make sense yet to me, but it is still early in the getting 
things working cycle.  It looks just like someone is shining a light on the 
camera.  As you know, it is not well sealed from stray light.  As I say, it 
is early, I have just figured out that it is hard to focus when pointing at 
a tree.

Tom Droege

At 08:17 AM 8/1/02 -0700, you wrote:
>Tom,
>   You don't start running into thermal radiation until you work
>in the near-IR (~2microns) under normal conditions.  Of course,
>red-hot glowing bodies will be observable in the visible bands!
>If the radiation is coming from the air conditioner, you would
>see a gradient in the image.  You don't tell us the structure
>or level of the extra light.
>   My guess is a combination of extra dark current due to the
>increased temperature level, coupled with a change in the bias
>level.
>Arne