Near-infrared analysis is used for a variety of materials analysis needs, from raw material identification to quantitative measurement of composition. ASD systems are used with library search techniques to qualitatively identify materials. This technique is useful for validation of raw material to assure the correct material has been received. ASD systems are also used with multivariate discriminant models to qualitatively compare a new sample to a model representing the expected diversity of this material. This technique is used to answer the question “Is it the same as previous samples.” Finally, ASD systems are used with multivariate quantitative models that can be used to predict the concentration of certain analytes such as moisture content. This is helpful for quantitative material analysis.
The flexibility to utilize different model types combined with the flexibility to measure samples where and when the measurement is needed, sets ASD systems apart from lab-based devices.