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Optical Charts
thermoMETER CT
5. Optical Charts
The following optical charts show the diameter of the measuring spot in dependence on the distance
between measuring object and sensor. The spot size refers to 90 % of the radiation energy. The distance is
always measured from the front edge of the sensor.
i
The size of the measuring object and the optical resolution of the infrared thermometer determine the
maximum distance between sensor and measuring object. In order to prevent measuring errors the
object should fill out the field of view of the optics completely.
Consequently, the spot should at all times have at least the same size as the object or should be
smaller than that.
D = Distance from the front of the sensor to the object
S = Spot size
The D:S ratio is valid for the focus point.
CTF-SF25
Optics: SF
D:S: 25:1
CT-SF22
Optics: SF
D:S: 22:1
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