Using some of the old data from James (attached below), I calculated the CCD conversion efficiency (CE) from electrons to bits (Counts).
Number of electrons(Ne) = QE*Number of Photons(Np)
noiseE = sqrt(Ne);
Number of Counts (NCo)= CE*Ne
Noise in Counts (noiseCo)= CE*sqrt(Ne)
noiseCo = sqrt(CE * NCo)
log(CE) = 2*noiseCo - NCo
Therefore CE = 10.0^(2*noiseCo - NCo)
From James's data on the intensity noise in the CCD, CE = 0.0269
Quote: |
Using this function, I did the same analysis of the upper-left 200x200 pixels over all 200 images:
(data from 200 images, over the upper-left 200x200 pixels)
|
|