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

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

doi:10.1364/OL.43.004065

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

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

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

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%.

Original language	English (US)
Pages (from-to)	4065-4068
Number of pages	4
Journal	Optics letters
Volume	43
Issue number	17
DOIs	https://doi.org/10.1364/OL.43.004065
State	Published - Sep 1 2018
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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

abstract = "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%.",

author = "Phillips, {Mark C.} and Brumfield, {Brian E.} and Harilal, {Sivanandan S.}",

note = "Publisher Copyright: {\textcopyright} 2018 Optical Society of America.",

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AU - Phillips, Mark C.

AU - Brumfield, Brian E.

AU - Harilal, Sivanandan S.

PY - 2018/9/1

Y1 - 2018/9/1

N2 - 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%.

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

Abstract

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