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

被引：11
|
作者：
Phillips, Mark C. [1 ]
Brumfield, Brian E. [1 ]
Harilal, Sivanandan S. [1 ]
机构：
[1] Pacific Northwest Natl Lab, Richland, WA 99352 USA
来源：
OPTICS LETTERS | 2018年 / 43卷 / 17期
关键词：
ATMOSPHERIC AMMONIA; OPEN-PATH; ABSORPTION-SPECTROSCOPY; ISOTOPOLOGUES; SPECTROMETRY; WATER; BAND;
D O I：
10.1364/OL.43.004065
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A swept-wavelength external cavity quantum cascade laser is used to measure time-resolved (NH3)-N-15 and (NH3)-N-14 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 (15) N abundance. Detection sensitivity of 150 ppb*m is demonstrated for a 50 ms measurement interval, improving to 10 ppb*rn with 10 s averaging, with isotopic precision as good as 0.8%. (C) 2018 Optical Society of America
引用
收藏
页码：4065 / 4068
页数：4
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