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Proceedings Paper

Demonstration of a rapidly-swept external cavity quantum cascade laser for rapid and sensitive quantification of chemical mixtures
Author(s): B. E. Brumfield; M. S. Taubman; M. C. Phillips
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Paper 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.

Paper Details

Date Published: 13 February 2016
PDF: 10 pages
Proc. SPIE 9755, Quantum Sensing and Nano Electronics and Photonics XIII, 975509 (13 February 2016); doi: 10.1117/12.2214200
Show Author Affiliations
B. E. Brumfield, Pacific Northwest National Lab. (United States)
M. S. Taubman, Pacific Northwest National Lab. (United States)
M. C. Phillips, Pacific Northwest National Lab. (United States)

Published in SPIE Proceedings Vol. 9755:
Quantum Sensing and Nano Electronics and Photonics XIII
Manijeh Razeghi, Editor(s)

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