Noninvasive particle sizing using camera-based diffuse reflectance spectroscopy

Otto Højager Attermann Abildgaard, Jeppe Revall Frisvad, Viggo Falster, Allan Parker, Niels Jørgen Christensen, Anders Bjorholm Dahl, Rasmus Larsen

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Diffuse reflectance measurements are useful for noninvasive inspection of optical properties such as reduced scattering and absorption coefficients. Spectroscopic analysis of these optical properties can be used for particle sizing. Systems based on optical fiber probes are commonly employed, but their low spatial resolution limits their validity ranges for the coefficients. To cover a wider range of coefficients, we use camera-based spectroscopic oblique incidence reflectometry. We develop a noninvasive technique for acquisition of apparent particle size distributions based on this approach. Our technique is validated using stable oil-in-water emulsions with a wide range of known particle size distributions. We also measure the apparent particle size distributions of complex dairy products. These results show that our tool, in contrast to those based on fiber probes, can deal with a range of optical properties wide enough to track apparent particle size distributions in a typical industrial process.
Original languageEnglish
JournalApplied Optics
Issue number14
Pages (from-to)3840-3846
Publication statusPublished - 2016

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© 2016 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

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