Abstract
We describe the application of incoherent broadband cavity-enhanced absorption
spectroscopy (IBBCEAS) for in situ measurements of atmospheric NO<sub>2</sub> 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 NO<sub>2</sub> (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.
© 2013 Chinese Optics Letters
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