基于分光光度计的食用油折射率实验研究  

Experimental study of refractive index of edible oil based on spectrophotometer

作　　者：李小康 许世军[1] LI Xiao-kang;XU Shi-jun(School of Science,Xi'an Technological University,Xi'an,Shaanxi 710021,China)

机构地区：[1]西安工业大学理学院,陕西西安710021

出　　处：《大学物理》2021年第2期42-47,共6页College Physics

摘　　要：为获取不同食用油的光学色散特异性,须研究其折射率随波长变化特征.忽略光的散射影响后,建立了一种用于分光光度计的新双层载玻片模型,用此载玻片分别盛载菜籽油、芝麻油、餐厨废弃油、掺伪菜籽油、掺伪芝麻油,实验获取380~1500 nm的透射光谱,进而研究了5种油品的折射率随波长变化特征.研究结果表明5种油品的折射率随波长的变化特性较相似,在1210 nm、1400 nm波长处均出现折射率特征峰;各油品在其特征峰处的折射率有着显著的区别,5种油品在1210 nm波长处的折射率分别为1.512、1.472、1.456、1.576、1.612.此研究证实了新双层载玻片模型是可行的,共同折射率特征值与共同特征光谱标志着不同油品存在诸多关联性成分,5种油品在1210 nm波长处的折射率特征值,可以作为油品鉴别的有效指标.In order to get the optical dispersion specificity of different edible oils,the change characteristics of its refractive index with the wavelength must be studied.After ignoring the scattering effect of light,a new double-layer slide model for the spectrophotometer has been established,the slide is used to hold the rapeseed oil,sesame oil,kitchen waste oil,adulterated rapeseed oil,adulterated sesame oil,respectively,the transmission spectrum of 380~1500 nm is obtained experimentally.Further,the change characteristics of the refractive index in the above five oil products with the wavelength are studied.The results have shown that the refractive index of five oil products is more similar with the change characteristics of wavelength,and the characteristic peaks of refractive index are all appeared at 1210 nm and 1400 nm wavelength;the refractive index of each oil product is significantly different at its characteristic peak,the refractive index of five oil products at the wavelength of 1210 nm is 1.512,1.472,1.456,1.576 and 1.612,respectively.This study has confirmed that the new double-layer slide model is feasible,the common refractive index characteristic value and the common characteristic spectrum have indicated that there are many related components in the different oil products.The refractive index characteristic value of five oil products at the wavelength of 1210 nm can be used as an effective index for the identification of oil products.

关 键 词：食品检验 折射率 食用油 分光光度计 双层载玻片模型 

分 类 号：O435-1[机械工程—光学工程]