Study On ATR Sensors Based On TD-ATR Mixed Oils Detection System

Batch transportation is mainly used for the pipeline transportation of product oils,and mixed oils are easily formed on the interface of different kinds of oils.The identifications of mixed oils are important to reduce accidents,improve economic efficiency,and make full use of energy.Optical methods with high sensitivity,various measuring methods and security with no pollution,have become a new direction of mixed oils detection,the terahertz time domain spectral detection method is one of them.In this paper,the terahertz time domain spectroscopy and attenuated total internal reflection spectroscopy are combined,and the applications of terahertz attenuated total reflectance spectroscopy to the detection of oils are proposed.This paper describes the detection principles of terahertz attenuated total reflection spectroscopy.The formulas that is used for calculating the optical parameters of refined oils are deduced from the terahertz attenuation total reflection spectrum;attenuated total reflection module which is the core component of the terahertz attenuated total reflection system is designed,and the design formulas of attenuated total reflection prisms are given.The parameters of the designed single / multiple reflection prism such as transmittance are calculated.The Light Tools software is used to do the optical simulations of designed prisms and optical system.Besides,the SolidWorks software is used to design sample pool for single reflection prism.In the end,the experiments of water and different kinds of oil products are finished by using terahertz attenuated total reflection system,and the response characteristics of different oil products in terahertz wave band are studied.Experimental results show that the time domain spectrums,frequency spectrums and the refractive index spectrums of different oils that obtained from the terahertz attenuation total reflection system are different,which confirm that terahertz attenuation total reflection spectrum technology can identify mixed oils,and provide a theoretical and experimental basis for its application in mixed oils interface detection.