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Chin. Phys. B, 2018, Vol. 27(10): 100601    DOI: 10.1088/1674-1056/27/10/100601
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Absolute density measurement of nitrogen dioxide with cavity-enhanced laser-induced fluorescence

Zheng-Hai Yang(杨正海), Yong-Cheng Yang(杨永成), Lian-Zhong Deng(邓联忠), Jian-Ping Yin(印建平)
State Key Laboratory of Precision Spectroscopy, School of Physics and Material, East China Normal University, Shanghai 200062, China
Abstract  

The absolute number density of nitrogen dioxide (NO2) seeded in argon is measured with cavity-enhanced laser-induced fluorescence (CELIF) through using a pulsed laser beam for the first time. The cavity ring down (CRD) signal is acquired simultaneously and used for normalizing the LIF signal and determining the relationship between the measured CELIF signal and the NO2 number density. The minimum detectable NO2 density down to (3.6±0.1)×108 cm-3 is measured in 60 s of acquisition time by the CELIF method. The minimum absorption coefficient is measured to be (2.0±0.1)×10-10 cm-1, corresponding to a noise equivalent absorption sensitivity of (2.2±0.1)×10-9 cm-1·Hz-1/2. The experimental system demonstrated here can be further improved in its sensitivity and used for environmental monitoring of outdoor NO2 pollution.

Keywords:  cavity-enhanced laser-induced fluorescence (CELIF)      cavity ring down (CRD)  
Received:  21 May 2018      Revised:  10 August 2018      Accepted manuscript online: 
PACS:  06.20.Dk (Measurement and error theory)  
  42.62.Fi (Laser spectroscopy)  
  07.88.+y (Instruments for environmental pollution measurements)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant Nos. 11504112, 91536218, and 11604100).

Corresponding Authors:  Lian-Zhong Deng     E-mail:  lzdeng@phy.ecnu.edu.cn

Cite this article: 

Zheng-Hai Yang(杨正海), Yong-Cheng Yang(杨永成), Lian-Zhong Deng(邓联忠), Jian-Ping Yin(印建平) Absolute density measurement of nitrogen dioxide with cavity-enhanced laser-induced fluorescence 2018 Chin. Phys. B 27 100601

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