measures irradiation reaching its sensor and is calibrated to indicate the temperature of a blackbody that produces the same flux. a steel billet having a diffuse, gray surface of emissivity 0.8 is heated in a furnace whose walls are at 900 k. a radiation thermometer views the billet through a small hole in the furnace. estimate the actual temperature, in k, of the billet when the radiation thermometer indicates 696 k

A subset of instruments called "thermal radiation thermometers" includes infrared thermometers. Infrared thermometers, also referred to as pyrometers or radiation thermometers, are non-contact thermometers that determine a body's temperature based on the thermal radiation it emits.

Although they are excellent for measuring surface temperatures, infrared thermometers do not assess an object's internal temperature. Infrared thermometers are incredibly quick, typically providing a reading in just a fraction of a second, or the time it takes for the processor to complete its calculations.

Distance temperature measurements are made by radiation thermometers. The length can be in miles or a thousandth of an inch. When other types of thermometers are not appropriate, radiation thermometers are frequently used.

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