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 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.
Just Accepted
