Distance to Target (Spot) Ratio
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The optical system of an infrared sensor collects the infrared energy from a circular measurement spot and focuses it on the detector. Optical resolution is defined by the ratio of the distance from the instrument to the object, compared to the size of the spot being measured (D:S ratio). The larger the ratio number the better the instrument's resolution, and the smaller the spot size that can be measured from greater distance.
The laser sighting included in some instruments only helps to aim at the measured spot, it does not measure anything. A recent innovation in infrared optics is the addition of a Close Focus feature, which provides accurate measurement of small target areas without including unwanted background temperatures. |
Field of View
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Make sure that the target is larger than the spot size the unit is measuring. The smaller the target, the closer you should be to it. When accuracy is critical make sure that the target is at least twice as large as the spot size.
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Ambient Temperatures (the Surrounding Temperatures)
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If the thermometer is exposed to abrupt ambient temperature differences of 20 degrees or more, allow it to adjust to the new ambient temperature for at least 20 minutes. Raytek fixed-mounted sensors are specified for performance within certain ambient temperature ranges. For example, the Thermalert MI 105 can withstand ambient temperatures (without water cooling) from 32 to 185°F (0 to 85°C).
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