Laser-induced fluorescence detection of atmospheric NO2with a commercial diode laser and a supersonic expansion

被引：0
|
作者：
Cleary, Patricia A. [1 ]
Wooldridge, Paul J. [1 ]
Cohen, Ronald C. [1 ,2 ,3 ]
机构：
[1] Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, United States
[2] Dept. of Earth and Planetary Sci., University of California, Berkeley, Berkeley, CA 94720, United States
[3] Div. of Energy and Environ. Technol., Lawrence Berkeley Natl. Laboratory, Berkeley, CA, United States
来源：
Applied Optics | 2002年 / 41卷 / 33期
关键词：
Air quality - Atmospheric optics - Nitrogen oxides - Semiconductor lasers - Signal to noise ratio;
D O I：
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学科分类号：
摘要：
Routine observations of atmospheric NO2at concentrations ranging from 0.1 to 100 parts per billion are needed for air quality monitoring and for the evaluation of photochemical models. We have designed, constructed, and field tested a relatively inexpensive and specific NO2sensor using laser-induced fluorescence. The instrument combines a commercial cw external-cavity tunable diode laser (640 nm) and a continuous supersonic expansion. The total package is completely automated, has a modest size of 0.5 m3and 118 kg, and could be manufactured at competitive prices with the current generation of instruments. The sensitivity of the instrument is 145 parts per trillion by volume min-1(signal-to-noise ratio of 2), which is more than adequate for monitoring purposes. © 2002 Optical Society of America.
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页码：6950 / 6956
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