Claims that one in 10 tents at
Occupy London remain empty overnight are based on "rubbish science", a military scientist specialising in camouflaging soldiers against thermal imaging technology has told the Guardian.
He said: "They cannot make the assumption that they have made from those images. The way they are set up, you wouldn't be able to tell if there's anyone in the tent or not, especially if someone is sleeping in an insulated sleeping bag."
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A camera of this kind would very rarely be able to see "into" a tent, said the scientist, as tent materials are almost always opaque to thermal imaging. A photographer would only be able to detect internal activity if the tent fabric was itself re-radiating heat produced by a warm object behind it – and this in turn would only be possible if very specific camera settings were used.
But the scientist said: "The first thing I noticed when I saw those images was that the camera was on an auto setting." In order for the images to be of any relevance, the photographer would have needed to manually adjust its settings,