Real-time trace gas sensing of fluorocarbons using a swept-wavelength external cavity quantum cascade laser

Mark C. Phillips; Matthew S. Taubman; Bruce E. Bernacki; Bret D. Cannon; Robert D. Stahl; John T. Schiffern; Tanya L. Myers

doi:10.1039/c3an01642k

Real-time trace gas sensing of fluorocarbons using a swept-wavelength external cavity quantum cascade laser

Mark C. Phillips, Matthew S. Taubman, Bruce E. Bernacki, Bret D. Cannon, Robert D. Stahl, John T. Schiffern, Tanya L. Myers

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

65 Scopus citations

Abstract

We present results demonstrating real-time sensing of four different fluorocarbons at low part-per billion (ppb) concentrations using an external cavity quantum cascade laser (ECQCL) designed for infrared vibrational spectroscopy of molecules with broad absorption features. The ECQCL was repeatedly swept at 20 Hz over its full tuning range of 1145-1265 cm⁻¹ providing a scan rate of 3535 cm⁻¹ s⁻¹, and a detailed characterization of the ECQCL scan stability and repeatability is presented. The ECQCL was combined with a 100 meter path length multi-pass cell for direct absorption spectroscopy. A portable sensor system is described, which was deployed on a mobile automotive platform to provide spatially-resolved detection of fluorocarbons in outdoor experiments. Noise-equivalent detection limits of 800-1000 parts-per-trillion (ppt) are demonstrated for 1 s integration times.

Original language	English (US)
Pages (from-to)	2047-2056
Number of pages	10
Journal	Analyst
Volume	139
Issue number	9
DOIs	https://doi.org/10.1039/c3an01642k
State	Published - Mar 31 2014
Externally published	Yes

ASJC Scopus subject areas

Analytical Chemistry
Biochemistry
Environmental Chemistry
Spectroscopy
Electrochemistry

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abstract = "We present results demonstrating real-time sensing of four different fluorocarbons at low part-per billion (ppb) concentrations using an external cavity quantum cascade laser (ECQCL) designed for infrared vibrational spectroscopy of molecules with broad absorption features. The ECQCL was repeatedly swept at 20 Hz over its full tuning range of 1145-1265 cm−1 providing a scan rate of 3535 cm−1 s−1, and a detailed characterization of the ECQCL scan stability and repeatability is presented. The ECQCL was combined with a 100 meter path length multi-pass cell for direct absorption spectroscopy. A portable sensor system is described, which was deployed on a mobile automotive platform to provide spatially-resolved detection of fluorocarbons in outdoor experiments. Noise-equivalent detection limits of 800-1000 parts-per-trillion (ppt) are demonstrated for 1 s integration times.",

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AU - Bernacki, Bruce E.

AU - Cannon, Bret D.

AU - Stahl, Robert D.

AU - Schiffern, John T.

AU - Myers, Tanya L.

PY - 2014/3/31

Y1 - 2014/3/31

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AB - We present results demonstrating real-time sensing of four different fluorocarbons at low part-per billion (ppb) concentrations using an external cavity quantum cascade laser (ECQCL) designed for infrared vibrational spectroscopy of molecules with broad absorption features. The ECQCL was repeatedly swept at 20 Hz over its full tuning range of 1145-1265 cm−1 providing a scan rate of 3535 cm−1 s−1, and a detailed characterization of the ECQCL scan stability and repeatability is presented. The ECQCL was combined with a 100 meter path length multi-pass cell for direct absorption spectroscopy. A portable sensor system is described, which was deployed on a mobile automotive platform to provide spatially-resolved detection of fluorocarbons in outdoor experiments. Noise-equivalent detection limits of 800-1000 parts-per-trillion (ppt) are demonstrated for 1 s integration times.

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Real-time trace gas sensing of fluorocarbons using a swept-wavelength external cavity quantum cascade laser

Abstract

ASJC Scopus subject areas

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