Metrohm NIRS XDS Process Analyzer – SingleFiber - Manual (Page 72)

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10.4.4 Window Correction, Transmission Pair
Window Correction is a method to permit the user to calibrate the single fiber optic path using a
calibration fixture. Next, the single fibers are attached to the actual sample cell, and the optical
differences are mapped. This gives a clear, repeatable measure of the optical difference between the
two geometries.
This window correction method offers a large advantage to
users running with sample cells permanently installed. At
initial set-up, the window difference is measured and stored
in Vision.
At periodic maintenance intervals, the single fiber optic
bundles can be removed from the sample cell, which is
permanently installed.
The instrument and single fiber optics can be calibrated for wavelength and Reference Standardized
response, without using the Sample Cell. After this is done, the single fiber optics are re-attached to
the sample cell, and the Window Correction is re-applied. This assures consistent response, without
removing the single fibers from the sample cell.
Because the spectroscopic response of sample fibers is dependent upon length and other factors,
screens will not be shown. Instead, the message boxes are given, in the order in which they appear.
Be sure the single fiber ends are securely fastened to the sample cell, and proceed using this set of
instructions.
From the Diagnostics menu, select Create Window
Correction.
NOTE: Window Correction must be enabled under
Configure, Options. When enabled, a new DCM
must be created for Window Correction to take
effect.
Vision requests a standard file. Select the file
“TSSZERO.da” as shown, from the C:\Vision
directory.
This file corrects the fiber optic path for the effects
of the barrels (windows) being installed.