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.

its refractive index with the wavelength must be studied. After ignoring the scattering effect of light，a new doublelayer

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.