In situ measurements of atmospheric NO2 using incoherent broadband cavity-enhanced absorption spectroscopy with a blue light-emitting diode

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（6）
• 页码范围: 77-80
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL201311.063001

摘要

We describe the application of incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS)for in situ measurements of atmospheric NO2 using a blue light-emitting diode.The mirror reflectivity is determined by the transmitted intensity variation through the cavity caused by Rayleigh scattering.Concentrations of atmospheric NO2 (1 to 35 ppbv) during the seven-day period are retrieved from the absorption spectra.The IBBCEAS measurement data are compared with those of a commercial long path differential optical absorption spectroscopy.The linear regression has a correlation coefficient and a slope of 0.983 and 0.975,respectively.