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Re: [ATM] infra-red

All CCDs are sensitive to IR.  CCD digital cameras have an IR rejection
filter built in to block the IR.

Jarvis Krumbein
 
On Sat, 27 Jan 2007 16:14:20 +0100 "Vladimir Galogaza"
<vladimir.galogaza1@zg.t-com.hr> writes:
> John,
> 
> >I have no way of explaining why velvet can be dark in red light and 
> much
> >brighter in the near-IR.
> 
> I do not know either but perhaps the answer is already in your 
> post.
> You have observed in one case with eye and in another with CCD via
> IR to visual converter.
> If CCD is more sensitive to near IR than your eyes to red, than 
> difference 
> is explained.
> True measurement should be done with detector equally sensitive to
> both wavelengths or calibrated to compensate for difference.
> 
> Regards
> Vladimir. 
> 
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> 
> 
 
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