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High sensitivity detection of NO2 employing cavity ringdown spectroscopy and an external cavity continuously tunable quantum cascade laser
Journal article   Peer reviewed

High sensitivity detection of NO2 employing cavity ringdown spectroscopy and an external cavity continuously tunable quantum cascade laser

Gottipaty N Rao and Andreas Karpf
Applied optics. Optical technology and biomedical optics, Vol.49(26), pp.4906-4914
09/10/2010
DOI: https://doi.org/10.1364/AO.49.004906
PMID: 20830179

Abstract

Nitrogen Dioxide - analysis Spectrum Analysis - methods Sensitivity and Specificity Environmental Monitoring - methods Lasers, Semiconductor Spectrum Analysis - instrumentation
A trace gas sensor for the detection of nitrogen dioxide based on cavity ringdown spectroscopy (CRDS) and a continuous wave external cavity tunable quantum cascade laser operating at room temperature has been designed, and its features and performance characteristics are reported. By measuring the ringdown times of the cavity at different concentrations of NO(2), we report a sensitivity of 1.2 ppb for the detection of NO(2) in Zero Air.

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