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Kỷ yếu hội nghị quốc tế 2011
Số tạp chí (2011) Trang:
Tạp chí: ASABE annual international meeting. 7-10 August 2011. Louisville, Kentucky, USA

Food quality is critically determined by its microstructure and composition. These properties could be quantified non-invasively by means of optical properties (absorption and reduced scattering coefficients) of the food samples. In this research, a spatially-resolved spectroscopy setup based on a fiber-optic probe was developed for acquiring spatially-resolved diffuse reflectance of five model foods with different designed microstructures and compositions in the range 400 ? 1100 nm. A model for light propagation in turbid media based on diffusion approximation for solving the radiative transport equation was employed to derive optical properties (absorption and reduced scattering coefficients) of these model foods. The accuracy of this light propagation model was validated on solid phantoms with known optical properties. Results of solid phantoms indicated that diffusion equation is sufficiently accurate for modeling light propagation in the investigated samples. Derived reduced scattering coefficients às? of the model foods obviously showed a logical correlation with the corresponding microstructures of the model foods analyzed by optical microscopy. Estimated absorption coefficients àa were also in good agreement with the designed ingredients of these model foods. The research results clearly support the potential of spatially-resolved spectroscopy for non-destructive food quality inspection and process monitoring in the food industry.

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