PicoQuant MultiHarp 150 - Page 50

PicoQuantGmbH MultiHarpSoftwareV.3.1.0.0
Theeffectofthefiltercannownicelybeseen.Firstobservetheredtrace(GeneratorG2onChannel2).The
histogramisnowemptyeverywhere,exceptinthevicinityofthebluepeak.Theremainingsliceoftheredtrace
isexactlythechosenfilterrangeof3nsoneithersideofthebluepeakfromG1.Next,observethebluepeak.
Comparedtotheunfiltereddatacollectionitisnowsubstantiallysmaller.Thisalsoistheeffectofthefilter,asall
blueeventsthathadnoredcompanioninthe3nsrangeweresuppressed.Thisnowgivesanicevisualexpla-
nationforthesignificantlyloweroutputrateofthefilterweobservedbefore.
Finally,wecanperformthesameexperimentwiththefilterswitchedto‘Invertedlogic’,leavingallothersettings
asbefore.WhatthismeansisthatthefilterwillnowsuppresseventsthatpreviouslywouldNOThavebeensup-
pressedandviceversa.Thisinversionmayhaveratherfewpracticalusecasesbutasyouwillseeshortly,it
makesforanicewayoffilterverificationanddemonstration.
Thefollowingfigureshowsthecorrespondingstateofthefilterdialogwithfiltertestrunning.Theoutputrateis
nowsignificantlyclosertotheinputratebutfromthefactthatitislowerthantheinputrateweseethatsome
eventsarestillbeingfilteredout.Indeedyoumaycheckthatthefilteroutputratesofinvertedversusuninverted
logicsumuptogivetheinputrate.
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