Use of external cavity quantum cascade laser compliance voltage in real-time trace gas sensing of multiple chemicals

Mark C. Phillips, Matthew S. Taubman, Jason Kriesel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Scopus citations

Abstract

We describe a prototype trace gas sensor designed for real-time detection of multiple chemicals. The sensor uses an external cavity quantum cascade laser (ECQCL) swept over its tuning range of 940-1075 cm-1(9.30-10.7 μm) at a 10 Hz repetition rate. The sensor was designed for operation in multiple modes, including gas sensing within a multi-pass Heriott cell and intracavity absorption sensing using the ECQCL compliance voltage. In addition, the ECQCL compliance voltage was used to reduce effects of long-term drifts in the ECQCL output power. The sensor was characterized for noise, drift, and detection of chemicals including ammonia, methanol, ethanol, isopropanol, Freon- 134a, Freon-152a, and diisopropyl methylphosphonate (DIMP). We also present use of the sensor for mobile detection of ammonia downwind of cattle facilities, in which concentrations were recorded at 1-s intervals.

Original languageEnglish (US)
Title of host publicationQuantum Sensing and Nanophotonic Devices XII
EditorsManijeh Razeghi, Eric Tournie, Gail J. Brown
PublisherSPIE
ISBN (Electronic)9781628414608
DOIs
StatePublished - 2015
Externally publishedYes
EventQuantum Sensing and Nanophotonic Devices XII - San Francisco, United States
Duration: Feb 8 2015Feb 12 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9370
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherQuantum Sensing and Nanophotonic Devices XII
Country/TerritoryUnited States
CitySan Francisco
Period2/8/152/12/15

Keywords

  • gas sensing
  • Infrared spectroscopy
  • quantum cascade laser
  • tunable laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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