15 May 2014 Optical transmission measurements for in-line monitoring of turbid oil-water emulsions
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Abstract
For absorbing media the concentration may be calculated directly from the optical transmission following the logarithmic dependence given in the Lambert-Beer law. Due to multiple scattering events in oil-water emulsions (e.g. milk, cream, etc.), these exhibit a nonlinear relationship between the attenuation and the oil concentration. We demonstrate that for increasing oil content in oil-water emulsions the attenuation first increases, then levels out, and finally even decreases for a fat content of 60%. Single-wavelength optical transmission measurements are found to be well suited for the in-line monitoring of oil-water emulsions of fat contents below 20%, e.g., for the in-line fat content monitoring of milk. Using experiments and ray-tracing simulations we evaluate system optimization.
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Philipp Metz, Katja Dopf, Markus Aichholz, Boris Riedel, Uli Lemmer, Barbara Freudig, Clifton Zimmermann, Martina Gerken, "Optical transmission measurements for in-line monitoring of turbid oil-water emulsions", Proc. SPIE 9141, Optical Sensing and Detection III, 91410J (15 May 2014); doi: 10.1117/12.2049396; https://doi.org/10.1117/12.2049396
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