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Audine KAF0402-ME with LPT1 interface = noise measurements in the offset frames


I take 70 offsets (with closed shutter, 0 sec exposure) with AudeLA v1.5. To make sure that all offsets are measured in constant conditions, the CCD camera is stabilized at -5.8 °C (1 hour stabilisation time).

Average frame of the 70 offsets
The average frame is calculated with the sigma clipping method with Matlab (sigma = 3, iterations = 2).







Map of noise standard deviations (sigma map)
For each pixel, I calculate the standard deviation (sigma) which gives a measurement of the noise. Then I represent the map of the sigma values. A periodic perturbation, probably linked to the use of the LPT1 interface, is visible.