Cedric Chang wrote:

>Another thing that might help is a space blanket, real thin material
>$2-$3 at Walmart.

Yeah, those are made of PET film, better known under a trade name 'Mylar'.
NASA have used the stuff on satellites and landers etc. to reflect heat from
the sun. A single sheet will reflect 90%+ of IR.

You can also get it from party shops, in the form of a gold or silver gift
wrap... but if it tears easily, it's not PET.

One concern here is I would expect the reflection to be very directional
just like the visible light is, so making it mirror-flat might not be
perfect for what you are trying to do. A laser pointer might be useful to
get the angles correct for a specific situation, and most video cameras are
sensitive to IR (not extremely, but enough to see the light from a remote
control) so it might be a useful calibration tool.

Andy

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