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Fast conversion factor measurement of a CCD using Images with vertical gradient

Fast conversion factor measurement of a CCD using Images with vertical gradient. Charge Transfer Efficiency based on The variance of the signal in flat Field images, gain correction. Fast conversion factor measurement of a CCD using Images with vertical gradient. Introduction.

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Fast conversion factor measurement of a CCD using Images with vertical gradient

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  1. Fast conversion factor measurement of a CCD using Images with vertical gradient Charge Transfer Efficiency based on The variance of the signal in flat Field images, gain correction

  2. Fast conversion factor measurement of a CCD using Images with vertical gradient Introduction Fast way to realize Photon Transfer Curve Appropriate to use this technique during CCD tuning The method Im1 + Im2 Im = For each line i of Im: The mean is calculated (Si) 2 For each line i of Is: The variance is calculated (σi2) Is = Im1 - Im2 Im1 and Im2, two TDI images Each (Si, σi2) pair is plotted

  3. Results. Future work. • Preliminary work. Mask cosmetic defects. • Flat Field of TDI images. • Weighted least square method. • Automatic detection of the beginning of the non linearity regime. • User friendly program.

  4. Charge Transfer Efficiency based on the variance of the signal in flat Field images, gain correction. Change in Variance in Flat Field (CVF) Method. For each line (column) i of Is: The variance is calculated (σi2) Each (i, σi2) pair is plotted Is = Im1 - Im2 Results

  5. How can I correlate previous plots to the CTE? Expression of the variance affected by the CTE (a = 1- b) Conclusion The best fit line of the previous plot: Gives us the Charge Transfer Efficiency:

  6. Results, Simulated data. Results, Real data. Conclusion • Results promising. • Mask cosmetic defects • Work in 2d instead of 1d • Direct comparison CVF versus ESO Fe55 setup • User friendly program

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