Re: Fwd:

[Helmut Faugel TE <htf@xxxxxxxxxx>]

On Tue, 18 Aug 1998, George L Smyth wrote:
> I rather doubt that the images would impart anything special.  I would imagine
> that the boiler would not be as hot as a soldering iron, so it will not emit
> infrared radiation in the recordable range.

If I remeber it in the right way IR-film can only record thermal radiation
form objects which are hotter than 400 degree Celsius. In G. Spitzings
book about IR-photography there is picture of a soldering iron recorded
on Ektachrome IR with a lens stopped down to f/5.6 and some (10 ?) minutes
exposure time in total darkness. So even if your object is very hot it
take a long time to record a picture, and it is nearly impossible to derive
the surface temperature from such a picture. 


- -- 
Helmut Faugel
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End of Infrared-Digest V0 #740
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