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Hyperspectral Diffuse Reflectance for Determination of the Optical Properties of Milk and Fruit and Vegetable Juice

机译:高光谱漫反射测定牛奶和果蔬汁的光学特性

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摘要

Absorption and reduced scattering coefficients are two fundamental optical properties for turbid biological materials. This paper presents the technique and method of using hyperspectral diffuse reflectance for fast determination of the optical properties of fruit and vegetable juices and milks. A hyperspectral imaging system was used to acquire spatially resolved steady-state diffuse reflectance over the spectral region between 530 and 900 nm from a variety of fruit and vegetable juices (citrus, grapefruit, orange, and vegetable) and milks with different fat levels (full, skim and mixed). The system collected diffuse reflectance in the source-detector separation range from 1.1 to 10.0 mm. The hyperspectral reflectance data were analyzed by using a diffusion theory model for semi-infinite homogeneous media. The absorption and reduced scattering coefficients of the fruit and vegetable juices and milks were extracted by inverse algorithms from the scattering profiles for wavelengths of 530-900 nm. Values of the absorption and reduced scattering coefficient at 650 nm were highly correlated to the fat content of the milk samples with the correlation coefficient of 0.990 and 0.989, respectively. The hyperspectral imaging technique can be extended to the measurement of other liquid and solid foods in which light scattering is dominant.
机译:吸收系数和减小的散射系数是混浊生物材料的两个基本光学特性。本文介绍了使用高光谱漫反射率快速测定果蔬汁和牛奶的光学特性的技术和方法。高光谱成像系统用于从各种水果和蔬菜汁(柑橘,葡萄柚,橙子和蔬菜)和具有不同脂肪含量(全脂)的牛奶中获取在530至900 nm光谱范围内的空间分辨稳态散射反射率,浏览和混合)。系统收集的源-探测器分离范围为1.1至10.0 mm的漫反射率。利用半无限均质介质的扩散理论模型分析了高光谱反射率数据。通过逆算法从530-900 nm波长的散射曲线中提取水果和蔬菜汁以及牛奶的吸收系数和降低的散射系数。 650 nm处的吸收系数和降低的散射系数值与牛奶样品中的脂肪含量高度相关,相关系数分别为0.990和0.989。高光谱成像技术可以扩展到其他以光散射为主的液体和固体食物的测量。

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