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2020-06-18 Calibration procedure for pedestals using charge injection
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Reconstruction of data in analysis
<calibrated-data> = (<raw-data> - pedestals) * <gain-factor>
where pedestals and <gain-factor> are per-pixel map combined from 7 gain mode maps.
Calibration preocedure
Accumulate dark data and evaluate pedestals for five gain modes:
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Assuming that each gain mode intensity sample is parametrized as
<intensity> = offset B + <charge-index> * <gain>G
each pixel has constants like
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- pedestal_AHL-L = pedestal_AHL-H - offset_ahl
- pedestal_AML-L = pedestal_AML-H - offset_aml
Reconstruction of data in analysis
<calibrated-data> = (<raw-data> - pedestal) * <gain-factor>
Panel results
detdaq18 run 52
Panel 2(counting from 0) /reg/g/psdm/detector/gains/epix10k/panels/0000000001-0175233793-0553648150-0743498629-0017156647-0000000000-0000000000
Pedestals for fixed gain modes FH, FM, FL
Pedestals for switching gain modes AHL-H, AML-M and derived AHL-L, AML-L
Offsets for switching gain modes AHL-H, AHL-L, AML-M, AML-L
Offsets difference H(or M) - L for AHL, AML
Gains for switching gain modes AHL-H, AHL-L, AML-M, AML-L
where pedestal and <gain-factor> are per-pixel map combined from 7 gain mode maps.
Questions
- is current procedure correct?
- if not, what is correct procedure?
- or what could we calibrate with charge injection?
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