Diode Laser Cavity Ring-Down Spectroscopy for Atmospheric NO2Measurement

Renzhi, 胡仁志 Hu; Dan, 王丹 Wang; Pinhua, 谢品华 Xie; Hao, 陈浩 Chen; Liuyi, 凌六一 Ling

doi:10.3788/aos201636.0230006

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to the direct measurement of NO with the CL method, NO concentrations can also be measured directly based on their absorption feature at 1585.282 cm −1 . For example, a tunable infrared laser differential absorption spectroscopy (TILDAS) instrument based on an infrared distributed feedback (DFB) laser emitting sequentially at 1600 and 1900 cm −1 has been used by Jagerska et al for the measurement of NO and NO 2 (Jagerska et al, 2015), where an astigmatic multi-pass Herriott cell (Herndon et al, 2004) and a dual-wavelength spectrometer are utilised. The 1 s precision for NO measurement of the TILDAS instrument was 550 ppt, whereas that for the field experiments was 1.5 ppb.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of NO and NO2 by a dual-channel cavity ring-down spectroscopy technique

Xie

et al. 2019

Atmos. Meas. Tech.

View full text Add to dashboard Cite

Abstract. Nitric oxide (NO) and nitrogen dioxide (NO2) are relevant to air quality due to their roles in tropospheric ozone (O3) production. In China, NOx emissions are very high and NOx emissions exhausted from on-road vehicles make up 20 % of total NOx emissions. In order to detect the NO and NO2 emissions on road, a dual-channel cavity ring-down spectroscopy (CRDS) system for NO2 and NO detection has been developed. In the system, NO is converted to NO2 by its reaction with excess O3 in the NOx channel, such that NO can be determined through the difference between two channels. The detection limits of NO2 and NOx for the system are estimated to be about 0.030 (1σ, 1 s) and 0.040 ppb (1σ, 1 s), respectively. Considering the error sources of NO2 absorption cross section and RL determination, the total uncertainty of NO2 measurements is about 5%. The performance of the system was validated against a chemiluminescence (CL) analyser (42i, Thermo Scientific, Inc.) by measuring the NO2 standard mixtures. The measurement results of NO2 showed a linear correction factor (R2) of 0.99 in a slope of 1.031±0.006, with an offset of (-0.940±0.323) ppb. An intercomparison between the system and a cavity-enhanced absorption spectroscopy (CEAS) instrument was also conducted separately for NO2 measurement in an ambient environment. Least-squares analysis showed that the slope and intercept of the regression line are 1.042±0.002 and (-0.393±0.040) ppb, respectively, with a linear correlation factor of R2=0.99. Another intercomparison conducted between the system and the CL analyser for NO detection also showed a good agreement within their uncertainties, with an absolute shift of (0.352±0.013) ppb, a slope of 0.957±0.007 and a correlation coefficient of R2=0.99. The system was deployed on the measurements of on-road vehicle emission plumes in Hefei, and the different emission characteristics were observed in the different areas of the city. The successful deployment of the system has demonstrated that the instrument can provide a new method for retrieving fast variations in NO and NO2 plumes.

show abstract

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of NO and NO2 by a dual-channel cavity ring-down spectroscopy technique

Xie

et al. 2019

Atmos. Meas. Tech.

View full text Add to dashboard Cite

show abstract

Development of a portable cavity ring down spectroscopy instrument for simultaneous, in situ measurement of NO₃ and N₂O₅

Xie

et al. 2018

Opt. Express

View full text Add to dashboard Cite

An inexpensive, compact instrument for sensitive measurement of nocturnal nitrogen oxides NO and NO in ambient air at high time resolution has been described. The instrument measures NO and NO which is converted into the NO radical through thermal decomposition by optical extinction using a diode laser at 662.08 nm in two separate detection channels. The minimum detection limits (1σ) for the NO radical and NO are estimated to be 2.3 pptv and 3.1 pptv in an average time of 2.5 s, with the accessible effective absorption path length generally exceeding 30 km, which is sufficient for quantifying NO radical and NO concentrations under moderately polluted conditions. The total uncertainties of the NO and NO measurements are 8% and 15% respectively, which are mainly dominated by the uncertainty of NO across section calculated for 353 K in this system. In addition, the dependence of the instrument's sensitivity and accuracy on a variety of conditions was presented in winter of 2016 and in summer of 2017 during two China-UK joint campaigns. Distinct NO vertical profiles were observed at night in winter. The equilibrium among observed NO, NO and NO based on the equilibrium constants during summer time also provides confirmation of the measurement accuracy of the instrument.

show abstract

Diode Laser Cavity Ring-Down Spectroscopy for Atmospheric NO₂Measurement

Cited by 2 publications

References 0 publications

Simultaneous measurement of NO and NO<sub>2</sub> by a dual-channel cavity ring-down spectroscopy technique

Simultaneous measurement of NO and NO<sub>2</sub> by a dual-channel cavity ring-down spectroscopy technique

Development of a portable cavity ring down spectroscopy instrument for simultaneous, in situ measurement of NO₃ and N₂O₅

Contact Info

Product

Resources

About

Diode Laser Cavity Ring-Down Spectroscopy for Atmospheric NO2Measurement

Cited by 2 publications

References 0 publications

Simultaneous measurement of NO and NO&lt;sub&gt;2&lt;/sub&gt; by a dual-channel cavity ring-down spectroscopy technique

Simultaneous measurement of NO and NO&lt;sub&gt;2&lt;/sub&gt; by a dual-channel cavity ring-down spectroscopy technique

Development of a portable cavity ring down spectroscopy instrument for simultaneous, in situ measurement of NO3 and N2O5

Contact Info

Product

Resources

About

Diode Laser Cavity Ring-Down Spectroscopy for Atmospheric NO₂Measurement

Simultaneous measurement of NO and NO<sub>2</sub> by a dual-channel cavity ring-down spectroscopy technique

Simultaneous measurement of NO and NO<sub>2</sub> by a dual-channel cavity ring-down spectroscopy technique

Development of a portable cavity ring down spectroscopy instrument for simultaneous, in situ measurement of NO₃ and N₂O₅