BUCHI NIRCal - Manual (Page 91)

Chemometrics
NIRCal 5.5 Manual, Version A 91
3.5.2 Available Pretreatments
Pretreatment
Type Short
Normalization by Closure* ncl
by Maxima* nma
by Sdev* nsd
to Unit Length* nle
between 0 and 1* n01
MSC Amplification * ** ma
MSC Full* ** mf
Divide by Spectrum div
Standard Normal Variate* SNV
Variance Scaling** vs
Offset Subtract DC* dc
Shift Negative to Zero* n2z
MSC Offset* ** mo
Add constant +c
Mean Centering ** mc
Subtract Spectrum sub
Smoothing Average 3 points sa3, sa3g2
***
Average 9 points sa9, sa9g2
***
Savitzky-Golay 9 points sg9, sg9g2
***
Derivatives
1st BCAP 5 points db1, db1g2
***
1st Taylor 3 points dt1, dt1g2
***
1st Savitzky-Golay 9 points dg1, dg1g2
***
2nd BCAP 3 points db2, db2g2
***
2nd Taylor 3 points dt2, dt2g2
***
2nd Savitzky-Golay 9 points dg2, dg2g2
***
2nd Taylor 3 points, Segment5, Gap5 (Linear
Filter - with fixed coefficients) ds2, ds2g2
***
3rd Taylor 5 points dt3, dt3g2
***
Transformation Absorbance Log
10
(1/x) log
Absorbance inverse 1/(10
-x
) ilg
2nd Derivative/Logarithm SDL
Kubelka Munk kmu
Square x
2
sqr
Reciprocal 1/x 1/s
Filter Linear Filter - with editable coefficients flt
* These pretreatments are wavelength dependent. The used wavelength is the selected calibration
wavelength, or can be edited in the NIR-Explorer under Pretreatments.
*** g2 stands for Gap2-filtering. These pretreatments have been adapted for improved performance for
N-500 spectra.