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Paul, You are talking about a "Thermal Imaging Camera". These usually work in the 8-14 Micron band. The lense will usually be made from Germanium and is Gold in appearance.
I don't think you will find a cheap one, but you might talk to your city
Fire Department as they use them to see through smoke. The camera usually has a built in viewing screen, and some also have a Video Out socket to run a lead to an external monitor.
This type of camera is also available for hire for industrial use such as looking at the heat loss from buildings or other objects.
Rgds
Michael
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