Development of a portable cavity-enhanced absorption spectrometer for the measurement of ambient NO 3 and N 2 O 5 : experimental setup, lab characterizations, and field applications in a polluted urban environment
作者： Haichao Wang , Jun Chen , Keding Lu
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摘要: Abstract. A small and portable incoherent broadband cavity-enhanced absorption spectrometer (IBBCEAS) for NO3 N2O5 measurement has been developed. The instrument features a mechanically aligned non-adjustable optical mounting system, the novel design of system enables fast setup stable operation in field applications. To remove influence strong nonlinear by water vapour, dynamic reference spectrum through NO titration is used analysis. wall loss effects sample were extensively studied, total transmission efficiencies determined to be 85 55 % NO3, respectively, our experimental setup. limit detection (LOD) was estimated 2.4 pptv (1σ) 2.7 pptv at 1 s intervals N2O5, respectively. associated uncertainty 19 % 22–36 % measurements from uncertainties efficiency, cross section, effective cavity length, mirror reflectivity. successfully deployed two comprehensive campaigns conducted winter summer 2016 Beijing. Up 1.0 ppb NO3+N2O5 observed with presence high aerosol loadings, which indicates an active night-time chemistry
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