二氧化硫检测仪光源系统的优化设计

为了解决国内传统二氧化硫检测仪在光路上存在荧光数量少、采集精确度低等问题,提出了一种改进的光路系统。点光源通过透镜进行平行准直及会聚,利用窄缝减弱杂散光的干扰,改善了传统光路结构上光会聚效果差的缺陷,提升了检测精度。运用Zemax对新光路和传统光路进行仿真,通过对比点列图、探测视图得出新光路的方均根半径减小到35.439μm,几何最大半径减小到50.194μm,气体与光源接触区域的光强提高。对其进行实验检测,数据表明改进后的光路系统的二氧化硫浓度示值误差由传统仪器的2%缩减为1%,提高了检测精度。新研制的光路系统能有效解决上述问题,适用于二氧化硫检测仪的设计。

Optimization Design of Light Source System for Sulfur Dioxide Detector

This paper proposes an improved optical path system to solve two problems caused by domestic traditional sulfur dioxide detectors:less optical path fluorescence and low acquisition accuracy.The point light source is collimated and concentrated using a lens,and a narrow slit is used to reduce interference of stray light,thereby improving the defect of the light intensity convergence effect on the conventional optical path structure and improving the detection precision as well.Zemax is used to simulate the new and original light paths.By comparing the point map and detection view,the root-mean-square radius and geometric maximum radius of the new light path are reduced to 35.439μm and 50.194μm,respectively,and the light intensity of the contact area between the gas and light source is improved.The experimental test shows that,compared with the conventional instrument,the sulfur dioxide concentration indication value error of the improved optical path system is reduced from 2%to 1%,improving detection accuracy.This newly developed optical path system can effectively solve above problems and is suitable for the design of sulfur dioxide detectors.