基于紫外荧光法的大气SO_2气体浓度分析仪  

Atmospheric SO_2 concentration analyzer based on ultra-violet fluorescence

作　　者：邱健[1] 杨冠玲[1] 何振江[1] 黄林海[1] 

机构地区：[1]华南师范大学物理与电信工程学院,广州510006

出　　处：《仪器仪表学报》2008年第1期174-178,共5页Chinese Journal of Scientific Instrument

摘　　要：本文详细介绍了紫外荧光法测量二氧化硫（SO2）浓度的原理和分析仪的电路系统设计。阐述了该分析仪硬件电路结构和软件系统结构与流程。分别实现了高温与制冷等温控电路对反应室、转换室和光电倍增管的温度控制；采用基于复杂可编程逻辑器件实现了对紫外荧光信号的信号拾取电路；实现了串行口与USB桥接电路；实现了并行口对GPIB接口电路模拟通信。在性能实验中，表明该分析仪样机能对浓度为0～143mg／m^3的SO2保持线性的和稳定的检测。与国外同类仪器的48h连续工作对比情况表明，该分析仪具有检测灵敏度高、实时检测以及稳定性好等特点，达到了实际应用的水平。The SO2 concentration measurement principle based on ultra-violet fluorescence and the design of SO2 analyzer circuit system are discussed. The paper expatiates on not only the hardware structure of the analyzer circuit, but also the structure and flow of the analyzer software. It respectively realizes temperature control of high temperature and cooling control circuits, which are used in reactor, converter and PMT. Acquisition of ultra-violet fluores-cence signal is implemented by CPLD. The USB interface is designed using UART to USB bridge. GPIB interface is simulated using parallel interface. Performance test proves that the analyzer can monitor the concentration of SO2 linearly and steadily in the range of 0 to 143 mg/m^3. Compared with same kind oversea analyzer, in 48-hour continuous operating experiment, this analyzer has the advantages of high sensitivity, real time measurement and good stability.

关 键 词：SO2监测 紫外荧光法 光子计数 仪器电路设计 性能测试 

分 类 号：TP216.3[自动化与计算机技术—检测技术与自动化装置]