Accessory Pack for Spectroscopy
Orthogonal Signal Correction enables the creation of improved models when
spectral data contains a great deal of interference or random variations
unrelated to the calibration or prediction.
Calibration Transfer functions save time by allowing calibration of instruments
using fewer calibration samples. This function also facilitates the development
of more robust models reducing the need to recalibrate.
Deresolv can be used to change the apparent resolution of an instrument.
Orthogonal Signal Correction (OSC)
This function calculates the orthogonal signal correction parameters for
preprocessing a spectral data prior to developing a PLS model. In situations
where the PLS model captures a very large amount of predictor block (X) variance
in the first factor but gets very little of the predicted variable (y or Y) it
can be very useful. In these cases it is useful to remove extraneous variance
from X that is unrelated to y. OSC does this by finding directions in X that
describe large amounts of variance while being orthogonal to y. Models are built
on OSC corrected data, then the OSC correction is applied before application of
the PLS models to new data.
NIR spectra of different alcohols |
Deresolv (high/low resolution instrument)
On occasion, one may wish to standardize a lower resolution instrument to a
higher resolution instrument. In such an instance, it may be more effective
to mathematically lower the resolution of the higher resolution instrument
prior to forming the transfer model. The Deresolv function can be used to
change the apparent resolution of an instrument and may also generate some
beneficial noise reduction. Deresolv works by FFTing the spectra, convolving
it with an impulse of specified width, then back FFTing the result.
Calibration Transfer Functions, (sample selection to do standardization)
The relationship between the responses of the two instruments is obtained
using spectra from a set of standardization samples or using a subset of
samples from the Instrument 1 calibration set. Selection of this subset can
be performed with a function. The function selects samples based on their
leverage, or uniqueness, within the group of spectra. Generally, 3 spectra
are sufficient for building a transfer function between instruments. |
The Unscrambler® Accessory Pack for Spectroscopy is developed in
collaboration with
CAMO continues its commitment to bring you today's most powerful modeling
advancements and innovations. Our first The Unscrambler® Accessory Pack not only
shows the flexibility and strength of the new features adopted into The
Unscrambler® but also demonstrates CAMO's ability to understand, respond to,
and satisfy customer needs more rapidly. |
|
