Other
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..conferd06k&link_type=abstract
"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec
Other
Mini-Symposium: Cavity Enhanced Spectroscopy
Scientific paper
We are developing compact instruments for the monitoring of ambient atmospheric species, specifically nitrogen dioxide and particles, using cavity attenuated phase shift spectroscopy. The sensor, which detects the optical absorption of nitrogen dioxide within a 20 nm bandpass band centered at 440 nm, comprises a blue light emitting diode, an enclosed metal measurement cell (26 cm in length) incorporating a resonant optical cavity of near-confocal design and a vacuum photodiode detector. An analog heterodyne detection scheme is used to measure the phase shift in the waveform of the modulated light transmitted through the cell induced by the presence of nitrogen dioxide and/or particles within the cell. The entire apparatus is encased within a standard 19-inch rack-mounted enclosure. Levels of detection (1 s, 3 σ ) for nitrogen dioxide of 0.2 ppb and for aerosols of 3.5 Mm^{-1} have been achieved. Examples of high resolution field measurements and comparisons with other instrumentation will be presented.
Freedman Adam
Herndon Scott C.
Kebabian P. L.
Onasch Timothy B.
Wood Ezra C.
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