【作者】 张志荣； 董凤忠； 王煜； 庞涛； 吴边； 涂郭结； 夏滑； 倪志波； 杨阳； 徐明明；

【Author】 Zhang Zhi-rong,Dong Feng-zhong,Wang Yu,Pang Tao,Wu Bian,Tu Guo-jie,Xia Hua,Ni Zhi-bo,Yang Yang,Xu Ming-ming (Anhui Provincial Key Laboratory of Photonic Devices and Materials,Anhui Institute of Optics&Fine Mechanics,Chinese Academy of Sciences,Hefei 230031)

【机构】 中国科学院安徽光学精密机械研究所,安徽省光子器件与材料重点实验室；

【摘要】 本文以30ppb的HF气体为例,简要介绍了可调谐半导体激光吸收光谱学方法(TDLAS)的工业气体分析技术。为了消除或者至少降低噪声干扰信号对系统稳定性的影响,针对系统应用的工业现场环境,设计完成了集数字信号发生器、数字锁相放大器和数据采集与预处理等功能的数字核心控制模块,替代了先前系统所采用的单板信号发生板,单板模拟锁相放大板、单板模拟数据采集卡等孤立单元和连接器单元。经过长期的实时测试结果证明数字核心控制模块无论从灵敏度还是稳定性等方面都对仪器的整体性能有较大的改善。更多还原

【Abstract】 Increased demands on air quality have created incentives for new methods to monitor gas pollution in production process.In this paper we will present an online open path gas analyzer based on tunable diode laser absorption spectroscopy (TDLAS) technique taking 30ppm HF gas as an example.Signal measurements with a sensitive device inevitably suffer from the predictable or unpredictable sources such as intensity fluctuations and the laser output wavelength dithers.In order to eliminate or at least reduce the measurement uncertainty and gain high reliability,a close-circle core-control module with functions of digital signal generator,digital board lock-in-amplifier,data acquisition and data processing has been developed to substitute the independent signal generator board,analog lock-in-amplifier and data acquisition card in our previous system.Utilizing the digital core-control module and the advanced digital signal processing techniques the performance of the TDLAS system has demonstrated great improvement in long term real time field tests.更多还原