Doug Horgan

An IR camera is only indirectly reading what you are looking for—it measures infrared light emissions, not temperature. Under certain conditions, you can get anomalous readings. Here are things to watch out for.

Emissivity. Most of the surfaces we see emit about the same amount of infrared, so temperature readings are comparable. The exceptions are low-emitting surfaces like shiny metal or reflective, smooth surfaces like glass. These surfaces reflect temperatures around them and don’t emit much IR when hot. To see how these surfaces compare, I put a...

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