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

Phillips, Mark C.; Brumfield, Brian E.; Harilal, Sivanandan S.

doi:10.1364/OL.43.004065

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

Journal Article · Sat Sep 01 00:00:00 EDT 2018 · Optics Letters

DOI:https://doi.org/10.1364/OL.43.004065· OSTI ID:1763361

Phillips, Mark C. ^[1]; Brumfield, Brian E. ^[1];

^[1]

BATTELLE (PACIFIC NW LAB)

A swept-wavelength external cavity quantum cascade laser is used to measure time-resolved 15NH3 and 14NH3 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 15N 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%.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1763361

Report Number(s):: PNNL-SA-135139

Journal Information:: Optics Letters, Vol. 43, Issue 17

Country of Publication:: United States

Language:: English

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