How critical is focusing the IR instrument?-FAQ-ircon.com
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Home > IR Education > FAQ > How critical is focusing the IR instrument?
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How critical is focusing the IR instrument?

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All infrared thermometers resolve a specific target size based on the model of the instrument and the distance from the sensor to the target.  Ideally the target should be 2 times larger than the spot size in order to indicate the correct temperature.  If the target is smaller than the resolved spot, then the instrument will measure everything that is filling the remainder of the target. 

These principles do not apply to two-color ratio thermometer.
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