太赫兹衰减全内反射油品检测系统中的棱镜设计

为了获得油品在太赫兹波段的衰减全内反射光谱，实现对油品的在线检测，利用光的折射定律，对太赫兹衰减全内反射系统中的核心部件——衰减全内反射棱镜进行了设计和实验。设计了单次反射棱镜，根据不同物质对太赫兹波的吸收程度不同，将单次反射棱镜用于太赫兹衰减全内反射系统，并进行了水和成品油的测试实验，取得了样品的光谱数据；进一步设计了多次反射棱镜，以增加油品对太赫兹的吸收，并对其进行了光学仿真。结果表明，经过单次全内反射，油品对太赫兹的吸收非常有限，无法实现对成品油的检测。该研究对下一步的油品检测是有帮助的。

Prism design for oil detecting systems based on terahertz attenuated total internal reflection

In order to obtain the attenuated internal reflection spectroscopy and realize on-line detection of oil in terahertz, the core components of total internal reflection system——the attenuated total internal reflection prism was designed by using the refraction law of light.At first, single reflection prism was designed and was used in terahertz attenuated total internal reflection system.According to the absorption of different material on terahertz wave, test experiments of water and product oil were carried out.Spectral data of samples were obtained.And then, multiple reflection prism was designed to increase the absorption of oil in terahertz, and optical simulation was carried out.The experimental results show that the absorption of oil after single total internal reflection is very limited, and the detection of oil cannot be achieved.The study is helpful for detection of oil quality.