How is the NIR different from the NMR analyzer?
The NIR analyzer is very sensitive to changes in sample temperature and uses the 3rd harmonic overtone as the basis of the NIR analysis. This means all of the spectra appear similar to a large extent, and extensive mathematical data manipulation are needed to find a difference in NIR analyzer output before any models can be built. Spectrometer repeatability and stability is critical if the calibrations are to going to produce meaningful and repeatable results. A change to the instrument components or process sample, e.g. temperature, may cause severe problems with established NIR models. A temperature controlled sample system is still needed at each measurement point. A validation sample must be introduced at each point to check calibration and the condition of the sample cell. Manual intervention is required for cleaning the sample probe. For NIR, temperature of the sample needs to be maintained at less than +1 degree C, or modeling must expand to include all the samples measured acro
