METHOD DETERMINING COMPOSITION OF MILK Russian patent published in 2003 - IPC

FIELD: measurement technology, equipment for optical analysis of multicomponent finely divided media, in particular. SUBSTANCE: method includes illumination of sample of milk by three coherent monochromatic radiation sources with different wave lengths. Radiation scattered back is recorded by detector, its signal is converted and fractions of fat and protein in total mass are computed by empirical formulas. Sample of milk is illuminated in turn and detector is set at angle of 30-40 degrees to direction of drop of intensity of scattered back radiation Ipλ1

, Ipλ2, Ipλ3. Signals U₁,U₂,U₃ are converted to digital form, then content of salts of heavy metals is additionally found by illumination of sample of milk along normal to surface by coherent monochromatic radiation in visible region of spectrum with wave length λ₄ different from radiation wave lengths of three sources. Spectrum of radiation scattered back in visible and near ultraviolet ranges ( (λ_а-λ_b) ) is recorded. Gradient of relative intensity is calculated in advance. After this its value is compared with a priory set value N and, if Δ₄≥N, then judgment on presence of impurities in the form of salts of heavy metals in milk is made. Concentration of impurities is found by deviation of maximum of peak of laser radiation with wave length λ₁ scattered back. Fractions of fat and protein in total mass are computed by empirical formulas with use of coefficients obtained beforehand and correction for concentration of salts of heavy metals proportional to , where is maximum of intensity of peak of radiation scattered back in wave range λ_x1-λ_x2. EFFECT: widened application field of method thanks to possibility of simultaneous determination of concentration of salts of heavy metals, fat and protein in milk, raised efficiency of ecological control over milk products. 3 dwg, 1 tbl