Owner manual

3
TH7899M
2201A–IMAGE–02/02
Figure3.CrossSectionalView(AA')ofaPhotoelementandPotentialProfileDuring
Integration
ImageArea Theimageareaconsistsofanarrayof2048x2048usefulphotoelementsforimaging.
Thematrixalsoincludes:
• 7columnsofdarkreferenceand5isolationcolumns(halfcovered)ontherightand
leftsides.Theisolationcolumnsaretoensurethe2048activecolumnsandare
100%photosensitive,
• 8supplementarylinesineachzoneABCandD;theselinesareusefulwhenusing
anopticalshieldincaseofframetransferarchitecturewithmemoryzonetocorrect
smearing(digitalcorrection).
Amongthese8linesinzonesAandD,3linesatthetopandatthebottomofthefull
imageareaaremaskedwithaluminium,alltheothersupplementarylinesare
photosensitive.
Theimageareaisdividedinto4partsof520lineseach(electricallybutnotoptically).
These4partscanbedrivenindependentlyallowingdifferentoperatingmodesas
describedhereunder.
FullFieldModes(No
MechanicalShieldOn
Package)
Insuchcasesamechanicalshutterisneededtoshieldthearrayfromincidentillumina-
tionduringthereadoutperiodtoavoidparasiticsignal(smearing)particularlyatlowdata
rates.Suchashutterisnotnecessaryifnolightiscomingontothephotosensitivearea
duringthereadouttime(e.g.incaseofpulsedlightsource).
Therearemainlythreedifferentmodeswhichcansquarewithdifferentopticalformats,
withreadoutoptimizedinspeedorwithsimplifiedoperatingconditions.