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Thread: handy gadget
face BY : Roman Black email (remove spam text)

Robert Rolf wrote:
> Because the glass envelope is opaqe to IR, you will only
> read the envelope temperature and NOT the target inside.
> For proof of this, just look at a near IR image of a house. The
> windows always show up as dark even though the inside air and
> objects are much hotter. Same thing for a human face with eyeglasses.
> Eyeballs don't register because the glass lenses block the IR from the
> eyes.

Ooooh. Now there's a WHOLE HEAP of things I just
have to test! ;o)

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Subject (change) handy gadget

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