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在现有的光纤辐射式高温计中,一般采用球面透镜聚光。由于光纤与透镜之间有一定的空间,光纤位于透镜的焦点附近,并同轴,因此安装比较难,体积也较大。 今在光纤辐射式测温中,首先使用四分之一节距自聚焦透镜作为聚光镜头,经分析其聚光特性,结果表明它具有良好的视场和极佳的成象景深,与光纤配合可做成体积小,结构简单紧凑、成本低、安装容易的光纤光路。它的适用范围广,可用于光纤内窥系统中。本文还推导出了温度分辨率与自聚焦透镜、光纤的结构参数的关系,可供系统设计时参考。
In the existing optical fiber pyrometer, the general use of spherical lens condenser. Since there is a certain space between the optical fiber and the lens, the optical fiber is located near the focal point of the lens and coaxial, so it is difficult to install and the volume is also larger. In the fiber optic radiation temperature measurement, the quarter-pitch self-focusing lens is firstly used as a condensing lens. The condenser performance is analyzed. The results show that it has a good field of view and an excellent imaging depth of field, Can be made of small size, simple structure, low cost, easy installation of optical fiber path. Its wide range of applications, can be used in optical fiber endoscopy system. This paper also deduced the relationship between the temperature resolution and the structure parameters of self-focusing lens and optical fiber, which can be used as a reference for system design.