Abstract
The quality of a dairy product is largely determined by its
microstructure which also affects its optical properties. Consequently,
an assessment of the optical properties during production
may be part of a feedback system for ensuring the quality of the
production process. This paper presents a novel camera-based
measurement technique that enables robust quantification of a
wide range of reduced scattering coefficients and absorption
coefficients. Measurements are based on hyperspectral images of
diffuse reflectance in the wavelength range of 470 to 1020 nm. The
optical properties of commercially available milk and yogurt
products with three different levels of fat content are measured.
These constitute a relevant range of products at a dairy plant. The
measured reduced scattering properties of the samples are
presented and show a clear discrimination between levels of fat
contents as well as fermentation. The presented measurement
technique and method of analysis is thus suitable for a rapid, noncontact,
and non-invasive inspection that can deduce physically
interpretable properties.
Original language | English |
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Journal | Applied Spectroscopy |
Volume | 69 |
Issue number | 9 |
Pages (from-to) | 1096-1105 |
ISSN | 0003-7028 |
DOIs | |
Publication status | Published - 2015 |
Keywords
- Non-invasive spectroscopy
- Oblique incidence reflectometry
- Diffuse reflectance
- Absorption
- Reduced scattering
- Turbid media
- Milk
- Yogurt