CALPRODUCT-VS-016: VIS Nonlinearity¶
Parent requirement¶
Scheduling¶
Monthly cadence of 16x NL sequences during nominal operation. 32x NL sequences during PV phase.
Time-critical¶
No.
Objective¶
Determine the VIS detection chain nonlinearity. A dense stellar field is observed with different exposure times, bracketed by pre-exposure flush and post-exposure read-out. The open shutter acqusition implies that the image object will have flush and read-out trails. The resulting trails must be dealt with at software level. Complementary, the nonlinearity is also calibrated using a sequence of LED flats. The NL estimated from the PTC can be used for further verification of this calibration product. The nonlinearity must be determined for each detector quadrant.
Fulfilled by¶
CALBLOCK-PV-024: VIS On-sky Nonlinearity
CALBLOCK-PV-033: VIS Flat Nonlinearity
CALBLOCK-F-007: VIS Nonlinearity, PTC, BFE and NISP LED flats
Data volume¶
58856 MB (PV phase)
29428 MB (monthly NL calibration)
Processing input¶
Ground Processing Input Data: TBD
Data Description: 80 images / month (160 images during PV phase).
Processing output¶
Coefficients for the nonlinearity solution for each detector quadrant (i.e. a total of 144 solutions).
Required accuracy, constraints¶
Images successfully acquired. Must have at least 1000 usable pixels per quadrant, integrated over all dithered exposures.
Processing tools¶
TBD
Quality control parameters¶
DataModel: https://gitlab.euclid-sgs.uk/
Contact person¶
VIS instrument scientist