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In this paper, the use of frustrated internal total reflection method and stimulating surface plasma wave configuration(Kretschmann configuration, Otto configuration). In this paper, the experimental study on the surface plasmon resonance angle of cottonseed oil in pure olive oil and inferior olive oil was studied by referring to the change of the thickness of gold, silver and copper film. The results of the paper are: Pure olive oil in Kretschmann configuration, gold film thickness is 40 nm, silver film thickness is 50 nm, copper film thickness is 40 nm, there is optimization of the surface plasma wave resonanc angle. Otto configuration, gold film thickness is 150 nm, silver film thickness is 305 nm, copper film thickness is 150 nm, there is optimization of the surface plasma wave resonanc angle. We measured cottonseed oil in poor olive oil, in Kretschmann configuration, gold film thickness is 41 nm, silver film thickness is 53 nm, copper film thickness is 42 nm, there is optimization of the surface plasma wave resonanc angle. Otto configuration, gold film thickness is 160 nm, silver film thickness is 300 nm, copper film thickness is 150 nm, there is optimization of the surface plasma wave resonanc angle.
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