A new sensor, being patented by Ohio State University, could be used to detect concealed weapons, or help pilots see better through rain and fog. Unlike X-ray machines or radar instruments, the sensor doesn't have to generate a signal to detect objects - it spots them, based on how brightly they reflect natural radiation. There is always a certain amount of radiation - light, heat, and even microwaves - in the environment. Every object - the human body, a gun or knife, or an asphalt run-way -reflects this ambient radiation differently.
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