A broadband cavity enhanced absorption spectrometer for aircraft measurements of glyoxal, methylglyoxal, nitrous acid, nitrogen dioxide, and water vapor
作者： K.-E. Min , R. A. Washenfelder , W. P. Dubé , A. O. Langford , P. M. Edwards
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摘要: Abstract. We describe a two-channel broadband cavity enhanced absorption spectrometer (BBCEAS) for aircraft measurements of glyoxal (CHOCHO), methylglyoxal (CH3COCHO), nitrous acid (HONO), nitrogen dioxide (NO2), and water (H2O). The instrument spans 361–389 438–468 nm, using two light-emitting diodes (LEDs) single grating spectrometer with charge-coupled device (CCD) detector. Robust performance is achieved custom optical mounting system, high-power LEDs electronic on/off modulation, high-reflectivity mirrors, materials that minimize analyte surface losses. have successfully deployed this during ground-based field campaigns to date. demonstrated precision (2σ) retrievals CHOCHO, HONO NO2 are 34, 350, 80 parts per trillion (pptv) in 5 s. accuracy 5.8, 9.0, 5.0 %, limited mainly by the available cross sections.
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