Thermal Imagery 

Here's a brief explanation of how thermal imaging works: All objects emit infrared energy (heat), The objects ability to emit energy is called emissivity. In general, the hotter an object is, the more radiation it emits. High wave infrared cameras detect the 8-14 wave lengths. The device collects the infrared radiation from objects and creates an image based on information about the temperature differences. Because objects are rarely in thermal equilibrium or the same temperature, a thermal camera can detect the slightest variation and depict those images in a range to show the variation.... 

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