基于量子级联激光器高灵敏快速检测机动车尾气排放气体浓度

汤媛媛; 刘文清; 阚瑞峰; 张玉钧; 张帅; 许振宇; 阮俊

doi:doi:10.3788/cjl201138.1215003

中国激光, 2011, 38 (12): 1215003, 网络出版: 2011-11-28

基于量子级联激光器高灵敏快速检测机动车尾气排放气体浓度

Rapid and Sensitive Measurements of Motor Vehicle Exhausts Using Quantum Cascade Lasers

论文大纲

汤媛媛 ^*刘文清阚瑞峰张玉钧张帅许振宇阮俊

作者单位

中国科学院安徽光学精密机械研究所环境光学与技术重点实验室，安徽合肥 230031

摘要

机动车尾气中的主要成分一氧化碳(CO)和一氧化氮(NO)不仅污染环境，对人体也有直接危害。由于CO和NO在中红外波段有强吸收谱线，适合采用红外吸收光谱技术进行检测。介绍了一种基于室温脉冲量子级联激光器测量尾气中CO和NO的装置，该装置利用长脉冲量子级联激光器产生的线性啁啾扫描气体分子完整的吸收谱线，测量精度高而且响应速度快，可达到低于1Hz的时间分辨率。对行驶状态下机动车排放的尾气进行了测量，结果显示该系统能够实时快速地测量不同车辆的尾气排放，并得到了不同燃油车型尾气中CO和NO的浓度分布。分析了浓度分布差异产生的原因。

Abstract

The main components of vehicle exhaust as carbon monoxide (CO) and nitric oxide (NO) not only pollute the environment, but also do great harm to human body. Since CO and NO have fundamental absorption in mid-infrared wave band, it is suitable to detect them with infrared absorption spectroscopy. A set of apparatus for the measurement of CO and NO with room-temperature pulsed quantum cascade lasers (QCLs) is introduced. This system utilizes long pulsed QCL which produces a complete scan of molecular absorption lines of gases to satisfy the need for sensitivity and rapid response, with a time resolution beyond 1 Hz. It is employed to measure CO and NO from moving vehicles exhausts. The results show its capability of investigating individual plumes. Different characteristics of CO and NO emissions for gasoline and diesel vehicles are also presented. An explanation to the difference is given.

参考文献

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汤媛媛, 刘文清, 阚瑞峰, 张玉钧, 张帅, 许振宇, 阮俊. 基于量子级联激光器高灵敏快速检测机动车尾气排放气体浓度[J]. 中国激光, 2011, 38(12): 1215003. Tang Yuanyuan, Liu Wenqing, Kan Ruifeng, Zhang Yujun, Zhang Shuai, Xu Zhenyu, Ruan Jun. Rapid and Sensitive Measurements of Motor Vehicle Exhausts Using Quantum Cascade Lasers[J]. Chinese Journal of Lasers, 2011, 38(12): 1215003.

基于量子级联激光器高灵敏快速检测机动车尾气排放气体浓度

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