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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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