Ametek Land Cyclops 390L - 6 OPTICS; 6.1 Target Size Calculation for variable focus instruments

6 - 1
Cyclops LPortable Thermometers
User Guide
OPTICS
6
The Cyclops hasaprecisionreexopticalsystem,whichprovidesuser-
focusable‘ThroughTheLens’sightingandgivesprecisedenitionofthetarget
spot.
ForCyclops 100L,160Land390L,thespeciedfocalrangeis1m/39.4into
innity.
ForCyclops 055L,thefocusisxedat5metres(approximately15ft).
6.1 Target Size Calculation for variable focus instruments
Thiscalculationappliesto100L,160Land390Lthermometers.
Theprecisionreexopticalsystemgivesanarroweldofview(180:1to98%
energy).Astheinstrumentisfocusable,youcancalculateanapproximate
targetsizefromtheinformationgiveninFig.6-1.
Targetdistance(D)fromopticaldatum
Targetdiameter(T)
Optical
datum
Fieldofview
Targetsize(T)(mm)=targetdistance(D)fromopticaldatum(mm)-100
     eldofview(180)
or
Targetsize(T)(in)=targetdistance(D)fromopticaldatum(in)-4
      eldofview(180)
Fig.6-1Cyclops thermometertargetsizecalculation