FLIR Systems FLIR TIG165 Manual

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FLIRTG165USERGUIDEDocumentIdentifier:TG165‐en‐US_AA

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4.3IRThermometerDistance‐To‐SpotRatio(24:1)

Basics

TheTG165Distance‐to‐Spotratio(D:S)is24:1.Fromadistanceof24”theTG165measurestheaverage

temperatureofaspot1”indiameter.Fromadistanceof48”thespotdiameteris2”andfromadistanceof72”

thespotdiameteris3”.Thetemperatureisshown

atthetopleftoftheTG165display.

ThermometerLens

InFig4‐1,thelens’fieldofviewisrepresentedbythegreendottedlinesemanatingfromthethermometer

lens.Thisfieldofviewisangled0.04

.Thespotsizes(greencircles1,2,and3”indiameter)areshowninFig4‐1

atdistancesof24,48,and72”.Twoviewsofthetargetspotsareshown:targetspotsasseenfromtheside,

andtargetspotsasseenfromtheuser’sperspective(pointingat

thetargetspotswithTG165inhand).

LaserPointers

TheLaserpointerlensesareshownasred(rightsidelens)andblue(leftsidelens)coloreddots.Theselenses

arehorizontaltooneanotheronthemeterbut,asthemeterismovedawayfromthetarget,theLaserbeams

rotatecompletelyverticalsoastocreatea1”spot

atadistanceof24”.Atadistanceof48”,theLasersrotate

further(2and8o’clockpositions)sothatthespotdiameteris2”.Thebeamsremainatthispositionforfurther

distances(comparethebeamrotationsat48”and72”).

DisplayCrosshairs

ThedisplaycrosshairsrepresentthetargetspotthattheIRThermometerlensissensing.

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Fig4‐1DistancetoSpotratioandtherotatingLaserpointerbeams