With the blackbody switched off we saved a series of 200 consecutive destructive scans. Collecting these scans in an IDL data cube, then drilling down through each pixel position to calculate the per-pixel standard deviation yields the following noise map:
Map of single-sampled noise in SCA115 (T=7K, 3s scan)
If we bin the noise values we get the following distribution:
Histogram of single-sampled noise values (electrons)
The histogram looks a little bimodal, and in fact on close examination one output looks brighter than the others in the noise map. Overall the median pixel noise is about 65e. I'm cooking the cds and sutr versions of this data presently, and we'll be able to try optimizing when/if we get more helium in :) Slowly, surely....
1 comment:
Great (except for the LHe part)! So, am I free to assume this says our readnoise is 65 e- and start updating my document? Just what I wanted to do....
I suggest subtracting a random one of the 200 from all the rest and looking for pickup noise.
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