Metrohm NIRS XDS Process Analyzer – DirectLight/NonContact - Manual (Page 67)

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The Certified 99% Reflectance
Reference is shown with the
sample channel spectrum, acquired
against the internal instrument
reference fiber. (Plot color is red.)
The wavelength scale is now wider,
because the Certified 99%
Reflectance Reference has a
spectrum from 400-2500nm. The
sample fiber spectrum (top) is still
plotted 800-2100nm.
After Reference Standardization,
the upper spectrum will be
corrected to look like the lower
spectrum. Click “OK” to plot a
correction spectrum.
The correction spectrum represents
the amount of spectral correction
required to provide a virtual 100%
reflectance reference at each data
point. (The correction is plotted in
violet.)
This is calculated in Vision. The
difference between the sample
fiber and the Certified 99%
Reflectance Reference, plus the
stored spectrum on the diskette or
Mini-CD, permits calculation of the
true response of the sample fiber,
on a scale of absolute absorbance.