10 Hardware of Near-Infrared Spectroscopy
257
Fig. 10.26 Flow chart showing the design process of a NIR spectrometer
10.3.1 The First Step: Test Measurement
At least thirty samples, which have various ingredient values, are prepared and the
spectra are measured using a high-grade laboratory-type NIR spectrometer. The true
ingredient values of the samples are also analyzed using other official/established
methods. The calibration is retrieved from the spectra and ingredient values using
multivariate statistical analysis.
If the calibration performance is not satisfactory, the conditions (optics, wavelength range etc.) are changed and measurements are repeated until a satisfactory
calibration is established.
257
Fig. 10.26 Flow chart showing the design process of a NIR spectrometer
10.3.1 The First Step: Test Measurement
At least thirty samples, which have various ingredient values, are prepared and the
spectra are measured using a high-grade laboratory-type NIR spectrometer. The true
ingredient values of the samples are also analyzed using other official/established
methods. The calibration is retrieved from the spectra and ingredient values using
multivariate statistical analysis.
If the calibration performance is not satisfactory, the conditions (optics, wavelength range etc.) are changed and measurements are repeated until a satisfactory
calibration is established.