Yan-yu ZHAO（赵雁雨）1, Na YAO（姚娜）2
(1. School of Electronic and Information Engineering，Beihang University，Beijing 100191，China； 2. Engineering Technology Research Center of Shanxi Province for Opto-Electronic Information and Instrument，North University of China，Taiyuan 030051，China)
Abstract-Signals from infrared detector are very weak in SO2 concentration measuring system. In order to improve the sensitivity of detection，combining with filter correlation technology and infrared absorption principle，the weak signal processing circuit is designed according to correlation detection technology. Under laboratory conditions, system performance of SO2 concentration is tested, and the experimental data are analyzed and processed.Then relationship of SO2 concentration and the measuring voltage is provided to prove that the design improves measuring sensitivity of the system.
Key words-SO2; infrared absorption; correlation detecting and filtering technology; weak signal processing
Manuscript Number: 1674-8042(2011)04-0394-04
doi: 10.3969/j.issn.1674-8042.2011.04.021
References
[1] Ji-ming Hao，Guang-da Ma， Shu-xiaoWang, 2010. Air pollution control engineering air pollution control engineering. Beijing: Higher Education Press, p.5-10.
[2] Pei-gang Jiang, 2009. Development and application of on-line infrared gas analyzers. Analytical Instrumentation, (6)：77-86.
[3] O.M.Chapman，M.Hilton, 2006. Low-cost gas correlation detection of methane. Optical Sensing II，p.6189.
[4] Fu-qi Si， Jian-guo Liu， Ping-hua Xie，et al., 2006. Application of correlative technology in atmospheric CO monitoring. Opto-Electronic Engineering, 33（7）：74-77.
[5] Xiao-ning Chen， Jian-guo Liu， Fu-qi Si，et al., 2008. Application of gas filter correlation technique in IR monitoring system of methane. Opto-Electronic Engineering, 35（4）：49-52.
[6] Dong-xu Liu， Zhi-bin Wang， Ji-long Zhang，et al., 2010. Design of faint signal processing circuit based on infrared methane sensor. Instrument Technique and Sensor, (6): 69-71.
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