@inproceedings{2b06e2b300c44dfca768e2878be0b18a,
title = "Demonstration of a rapidly-swept external cavity quantum cascade laser for rapid and sensitive quantification of chemical mixtures",
abstract = "A rapidly-swept external-cavity quantum cascade laser with an open-path Herriott cell is used to quantify gas-phase chemical mixtures of D2O and HDO at an update rate of 40 Hz (25 ms measurement time). The chemical mixtures were generated by evaporating D2O liquid near the open-path Herriott cell, allowing the H/D exchange reaction with ambient H2O to produce HDO. Fluctuations in the ratio of D2O and HDO on timescales of < 1 s due to the combined effects of plume transport and the H/D exchange chemical reaction are observed. Based on a noise equivalent concentration analysis of the current system, detection limits of 147.0 ppbv and 151.6 ppbv in a 25 ms measurement time are estimated for D2O and HDO respectively with a 127 m optical path. These detection limits are reduced to 23.0 and 24.0 ppbv with a 1 s averaging time for D2O and HDO respectively. Detection limits < 200 ppbv are also estimated for N2O, F134A, CH4, Acetone, and SO2 for a 25 ms measurement time.",
keywords = "external cavity quantum cascade laser, infrared spectroscopy, trace gas sensing",
author = "Brumfield, {B. E.} and Taubman, {M. S.} and Phillips, {M. C.}",
note = "Publisher Copyright: {\textcopyright} 2016 SPIE.; Quantum Sensing and Nano Electronics and Photonics XIII ; Conference date: 14-02-2016 Through 18-02-2016",
year = "2016",
doi = "10.1117/12.2214200",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Brown, {Gail J.} and Manijeh Razeghi and Lewis, {Jay S.}",
booktitle = "Quantum Sensing and Nano Electronics and Photonics XIII",
}