Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 106, Issue 2, Pages 501-509Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-011-4818-3
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Funding
- Region Nord-Pas de Calais
- Groupement de Recherche International SAMIA
- CNRS (National Center for Scientific Research, France)
- RFBR (Russian Foundation for Basic Research, Russia)
- CAS (Chinese Academy of Sciences, China)
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We report on the development of an optical instrument based on incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) for simultaneous open-path measurements of nitrous acid (HONO) and nitrogen dioxide (NO2) in ambient air using a UV light emitting diode operating at similar to 366 nm. Detection limits of similar to 430 pptv for HONO and similar to 1 ppbv for NO2 were achieved with an optimum acquisition time of 90 s, determined by an Allan variance analysis. Based on a 1.85 m long high optical finesse open-path cavity, the effective optical path length of 2.8 km was realized in aerosol-free samples or in an urban environment at modest aerosol levels. Such a kilometer long optical absorption is comparable to that achieved in the well established differential optical absorption spectroscopy (DOAS) technology while keeping the instrument very compact. Open-path detection configuration allows one to avoid absorption cell wall losses and sampling induced artifacts. The demonstrated sensitivity and specificity shows high potential of this cost-effective and compact infrastructure for future field applications with high spatial resolution.
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