Near-infrared spectroscopy particle size distribution

A. Gupta, G.E. Peck, R.W. Miller and K.R. Morris, Nondestructive measurements of the compact strength and the particle-size distribution after milling of roller compacted powders by near-infrared spectroscopy, J. Pharm. Sci., 93(4), 1047-1053 (2004). 

A.J. O Neil, R.D. Jee and A.C. Moffat, Measurement of the cumulative particle size distribution of microcrystalline cellulose using near infrared reflectance spectroscopy. Analyst, 124, 33-36 (1999). 

M. Blanco and A. Peguero, An expeditious method for determining particle size distribution by near infrared spectroscopy comparison of PLS2 and ANN models, Talanta, 77(2), 647-651 (2008). 

Near-Infrared Spectroscopy. Near-infrared (NIR) spectroscopy is a technique that has been around for some time but, like NMR spectroscopy, has only recently been improved and developed for on-line applications. Near-infrared analysis (NIRA) is a nondestructive technique that is versatile in the sense that it allows many constituents to be analyzed simultaneously 112, 113). The NIR spectrum of a sample depends upon the anharmonic bond vibrations of the constituent molecules. This condition means that the temperature, moisture content, bonding changes, and concentrations of various components in the sample can be determined simultaneously. In addition, scattering by particles such as sand and clay in the sample also allows (in principle) the determination of particle size distributions by NIRA. Such analyses can be used to determine the size of droplets in oil-water emulsions. 

Hareland, G. A., Evaluation of Flour Particle Size Distribution by Laser Diffraction, Sieve Analysis and Near-infrared Reflectance Spectroscopy, J. Cereal Set, 1994,21, 183-190. 

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