BUCHI NIRCal - Manual (Page 136)

NIRCal 5.5 Software Manual
136 NIRCal 5.5 Manual, Version A
3.13 Q-Value
Menu: Calibration / Q-Value Protocol
Icon:
In NIRCal calibrations can be rated via the Q-Value. The Q-Value sums up all important criteria.
The Q-Value is part of the calibration protocol, there is no separate calculation necessary
After several calibration optimization and running the automatic calibration module (Step 2: Calibrate),
there are several calibrations in the project. Sort the calibrations with a click on the Name or Q-Value.
The calibration are sorted with increasing or decreasing Q-Value.
NOTE
Keep only the best 2-4 calibrations and delete all others.
Further details can be found in the
Calibration Protocol or in the description of the matrix Q-Value .
3.14 Change X-Unit Wavelength / Wavenumber
Menu: Project / Spectra / Change X-Unit to
Icon:
Changes the x-axis units for the display of spectra to nm.
Changes the x-axis units for the display of spectra to 1/cm.
3.15 Convert and Import spectra from other instruments to DB
It is possible to import spectra measured with:
NIRVis and NIRFlex N-400
NIRLab N-200
other instruments (in case the wavelength range is similar)
into the NIRWare Database. In order to use those spectra with the NIRFlex N-500 the spectral data
need to be converted prior to saving them into the Database to reach the compatibility. The spectra
should be stored into the database, the project should be closed, opened again and the calibration
should be created.
These steps are explained in detail below.
Typically following conversions can be made with Büchi instruments:
NIRVIS /
NIRFlex N-400 NIRLab N-
200 Convert NIRFlex N-
500
Reflectance Absorbance --> Reflectance
[1/cm] 4'008 - 9996 3'999,67 -
10'001,1 --> 4'000 -
10'000
Resolution 25 8 8*
Step 12 3,85696 4
Datapoints 500 1'557 --> 1'501
Remarks Values at 4000,
4004 are
repeated from
4008 and
10'000 is
repeated from
9996 Transformed
by ilg
(inverse
logarithm)
Pretreatment.
* can be 16, but this is not suggested.