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Application Notes
In an infrared (IR) thermography application where an IR camera is used, understanding the object’s surface emissivity is crucial because it significantly impacts the temperature measurement result. This is especially true for a quantitative thermography application where temperature accuracy is the primary concern. This application note explains practical ways to acquire or estimate the emissivity ([) of the target objects objects when using an infrared imaging radiometer.
Emissivity Basics
Emissivity relates to the radiation of thermal energy from the surface of a target object. The emissivity, [, is defined as the ratio (between 0 and 1) of the thermal radiation from a target’s surface to the radiation from an ideal black body, ([ = 1), at the same temperature. Objects which have high emissivity emit more thermal energy through radiation compared to objects with low emissivity. As emissivity gets higher, reflected thermal radiation lowers.
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