Q. What is the role of distance-to-spot ration (D:S) in temperature measurement?
Answer
The distance-to-spot ratio (D:S) is the ratio of the distance to the measurement surface and the diameter of the temperature measurement area. For example, if the D:S ratio is 12:1, the diameter of the measurement area is one-twelfth of the distance to the object. An infrared thermometer with a higher ratio of D to S is able to sense a more-specific, narrower surface at a greater distance than one with a lower ratio. A 12:1 rated device can sense a 1-inch circle at a distance of one foot.
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