Metrohm NIRS XDS Process Analyzer – MicroBundle - Manual (Page 65)

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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.
A final spectrum (green when plotted
on-screen) is plotted to verify that the
corrected spectrum produces the same
results as the Certified 99% Reflectance
Reference.
Click “Close Report” to continue. The
correction is automatically downloaded,
and is saved in the Diagnostic Data
Base.
The correction will be applied in real
time to all spectra taken with a DCM
where “Reference Standardization” is
checked. This applies to all projects,
using any DCM with Reference
Standardization selected.