Ametek LAND SYSTEM 4 User Supplement page 8

Target Orbiting Thermometer User Supplement
d = target spot diameter ≤ D/100 (D/200 for high temperature versions)
Optical Field of View (=D/d)
Fig. 1 Field of view of Standard System 4 Thermometer
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d = target spot diameter (identical to a 'standard' thermometer)
rad = D/29
Optical Field of View (=D/d)
Fig. 2 Field of view of Target Orbiting Thermometer
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