Everything emits heat. Even ice has atoms bouncing around to give off some kind of heat. An infrared or thermal imaging camera works by measuring the infrared radiation or heat signature emanating from objects. The camera must be fitted with a lens that allows IR frequencies to pass through, focusing them on to a special sensor. Uses of thermal imaging include temperature reading for people through airports, retail and other entry points; policing, smuggling purposes, gas leaks, electrical outages and architectural defects.

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