How can the emissivity of an object be determined?
- First, measure the surface temperature of the object to be measured with a surface-type thermocouple probe. Measure the same surface with an IR thermometer, adjusting emissivity on the thermometer until the temperature readings on both the thermocouple and IR meters agree.
- For temperatures up to approximately 500°F (260°C), place a piece of regular masking tape on the object to be measured. Allow the tape to reach thermal equilibrium with the object. Using an IR thermometer with the emissivity set at 0.95, measure and note the temperature of the masking tape. Then, measure the surface temperature of the object. Adjust the emissivity until the temperature of the object is the same as that of the tape.
How critical is focusing the infrared instrument?
All infrared thermometers have a specific target size they need to see in order to measure the temperature. The target should be 2 times the spot size in order to indicate the correct temperature. In case the target is smaller than the spot the instrument will measure anything that is filling the remainder with the target. This is not true of a two-colour instrument.
