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View Diary: Media Drones prevent Firefighting Helicopters from Reaching Burning Village in Norway (42 comments)

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  •  Just to elaborate (2+ / 0-)
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    OllieGarkey, ontheleftcoast

    Near-infrared (just below the threshold of human vision), which is used in most "night visions" gear (such as wildlife cameras) operates pretty much the same way as visible light: it can see through glass, can go through some thin fabrics (notably swimsuits) but is blocked by opaque materials (such as walls and roofs). It's also needs something to produce the light, whether a regular light or an infrared light or something glowing hot.

    Mid-infrared and long-wave (thermal) infrared are what are used by heat-seeking applications and thermal imaging cameras (what most people think of when they picture an infrared camera) and heat-detectors used in security systems.

    Mid-infrared is produced by hot objects that aren't quite hot enough to glow (like jet engines). Thermal is just what it sounds like.

    Neither can be seen through opaque objects, and thermal has a problem with regular glass.

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