A Thermogram of a hot rifle
A Thermogram of a hot rifle. This gun has just fired a dozen bullets and the barrel is quite hot. The different colors represent different temperatures on the object. The lightest colors are the hottest temperatures, while the darker colors represent a cooler temperature. Thermography uses special cameras that can detect light in the far-infrared range of the electromagnetic spectrum (900?14,000 nanometers or 0.9?14 µm) and creates an image of the objects temperature..

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