Re: DTP70 specs
Re: DTP70 specs
- Subject: Re: DTP70 specs
- From: Roger Breton <email@hidden>
- Date: Sat, 13 Aug 2005 11:00:04 -0400
> It is very common practice to use a tungsten light source for the
> illuminant in spectrometers. The light source spectrum is removed from
> the measurement to give the spectrum for the material only, which can
> then be combined mathematically with the D5000 theoretical spectrum to
> give a result for the object as if it were illuminated with D5000
> light. There are no illuminants that produce the exact D5000 spectrum,
> so this is common practice.
>
> Robin Myers
In theory (and practice), you say that the tungsten light source is used
*only* to derive the spectral radiance factor, and then that information is
integrated with the user's choice of CIE or Custom measured Illuminant and
Observer function to compute the tristumulus values?
Makes sense to me. What's interesting, nevertheless, is that we'll obtain
different radiance factor depending on the actual light source used in the
instrument, won't we? Or is this difference attenuated or eliminated when
taking into consideration traceability and factory calibration?
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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