Amplifier crosstalk measured

Amplifier crosstalk measured

Capella - highly defocussed

29-04-2010

High signals spark electric ghosts in the other quadrants of the ITL 4kx4k chips.

We used four images similar to the one above. A highly defocused image of a bright star was placed such that it covered most of area of a single quadrant. We then measured the remainder signal in all the three adjacent quadrants and solved for the matrix αij in the following equation Imeas = Σi=1...4 αij I0i.  Amplifier correction is done by inversion of αijand applying it to the measured signal Imeas, retrieving the incident signal I0.