@inproceedings{ce4c2ccd61c94bb5b9be12f31c539290,
title = "Application of rapidly swept external cavity quantum cascade lasers for open-path and standoff chemical sensing",
abstract = "Rapidly-swept external-cavity quantum cascade lasers (swept-ECQCLs) provide the broad IR spectral coverage and high spectral brightness required for sensitive multi-chemical standoff detection. The laser source characteristics of swept-ECQCLs can be applied to a variety of standoff applications where gas-phase chemical species concentrations are changing rapidly in time. Some of these applications include standoff measurements in turbulent or chemically reactive plumes, monitoring of industrial emissions from stacks, and real-Time monitoring of combustion processes. We have demonstrated and characterized a swept-ECQCL design that is capable of broadband spectral acquisition (∼100 cm-1) at a 5 ms acquisition rate with a high spectral resolution (<0.2 cm-1). Laser systems based on this swept-ECQCL design have been applied to open-path and standoff measurements in turbulent and reactive chemical plumes of time-varying chemical and isotopic composition. Chemical plume studies have demonstrated the capability of this technology for open-path and standoff chemical sensing applications. In this talk we will present our current progress on the development and application of swept-ECQCL technology for sensitive and rapid multi-chemical open-path measurements in MeOD/MeOH plumes with time-varying isotopic composition at a 40 Hz rate. Preliminary results will also be provided for a 5 m standoff detection of hot CO and CO2 in a turbulent flame using a rapidly-swept mode-hop free (MHF) ECQCL design that is capable of collecting 1-2 cm-1 MHF spectral windows at an acquisition rate of 1 kHz with a spectral resolution of ∼0.001 cm-1.",
keywords = "Gas sensing, Infrared spectroscopy, Quantum cascade laser, Standoff detection, Tunable laser",
author = "Brumfield, {Brian E.} and Phillips, {Mark C.}",
note = "Funding Information: The writing of this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology under a contract from the National Aeronautics and Space Administration. Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; 2018 Micro- and Nanotechnology (MNT) Sensors, Systems, and Applications X Conference ; Conference date: 15-04-2018 Through 19-04-2018",
year = "2018",
doi = "10.1117/12.2305056",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Islam, {M. Saif} and Thomas George and Dutta, {Achyut K.}",
booktitle = "Micro- and Nanotechnology Sensors, Systems, and Applications X",
}