CCD pixel-to-pixel variations

[Klaus Reif]

Posted to CCD-world:
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Hello Scott,

>QUESTION #1:
>	Since no light is falling on the CCD during the dark frame
>	exposure, what value of the PRNU would I use, since it
>	shows such dramatic variations as a function of wavelength
>	in the table above?
>

   we have found that the pixel-to-pixel QE variation (i.e. PRNU) 
and the pixel-to-pixel variation of thermal electron generation
(no acronym so far?) are different by an order of magnitude or
more. We have seen values for the latter of 20 to 30 percent
(standard deviation) at room temperature. PRNU values were 
usually between a few and less then 1 percent as indicated 
in the EEV table. These two effects should therefore be considered 
and corrected separately. 

Klaus Reif


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Klaus Reif
Sternwarte of the Univ. of Bonn                 Phone:    +49 228 737834
Auf dem Huegel 71                                   FAX:     +49 228 733672
D 53121 Bonn                                          Email:
reif at astro.uni-bonn.de
Germany                                                   WWW:
http://www.astro.uni-bonn.de/~reif
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