Real-time standoff detection of nitrogen isotopes in ammonia plumes using a swept external cavity quantum cascade laser

Optics Letters
M C PhillipsSivanandan S Harilal

Abstract

A swept-wavelength external cavity quantum cascade laser is used to measure time-resolved NH315 and NH314 concentrations and isotope ratios in a turbulent plume source located at 10 m standoff distance. Measurements show excellent agreement with expected values of isotope ratios for samples with natural and enriched N15 abundance. Detection sensitivity of 150 ppb*m is demonstrated for a 50 ms measurement interval, improving to 10 ppb*m with 10 s averaging, with isotopic precision as good as 0.8%.

References

Feb 28, 2013·Sensors·Michal Nikodem, Gerard Wysocki
Sep 8, 2017·The Journal of Physical Chemistry Letters·Adam J FleisherJoseph T Hodges

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