Open path measurements of ozone, water vapor, CO2 and atmospheric temperature using intrapuls tuning method of quantum cascade laser

被引:0
作者
Taslakov, M. [1 ]
Simeonov, V. [1 ]
van den Bergh, H. [1 ]
机构
[1] Swiss Fed Inst Technol, Lab Air & Soil Pollut, ENAC, Bat CH Stn 6, CH-1015 Lausanne, Switzerland
来源
14TH INTERNATIONAL SCHOOL ON QUANTUM ELECTRONICS: LASER PHYSICS AND APPLICATIONS | 2007年 / 6604卷
基金
瑞士国家科学基金会;
关键词
spectroscopy; meteorology; humidity; temperature; open path measurements; atmospheric monitoring; air pollution measurements;
D O I
10.1117/12.727145
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We report on application of a distributed feedback (DFB) quantum cascade laser (QCL) for open path spectroscopic monitoring of ozone, water vapor, CO2 and air temperature. The thermal chirp during a 400 ns long laser pulse at repetition rate of 1 kHz is used for fast wavelength scanning of two water vapor absorption lines, few O-3 lines and a CO2 line, centered at 1032 cm(-1). A tuning range of 1.7 cm(-1) is achieved. The fast wavelength scanning of the QCL has the advantage of not being affected by atmospheric turbulence, which is essential for long open path measurements. A direct absorption method was adopted in the measurements. Monostatic experimental setup, consisting of a QCL, a retroreflector and a detector is employed. The lowest detection limit for ozone is about 0.2 ppb at 6 km open path. The relative humidity measurements sensitivity depends on the temperature and at 293 K is about 1%. The resolution of the temperature measurements is better than 0.5 K. The column densities and temperature retrieved from the transmittance spectra are obtained, performing averaging of 10 seconds, which is much shorter, compare to other open path techniques.
引用
收藏
页数:5
相关论文
共 2 条
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