Localization and quantification of trace-gas fugitive emissions using a portable optical spectrometer

Eric J. Zhang, Chu C. Teng, Theodore G. Van Kessel, Levente Klein, Ramachandran Muralidhar, Chi Xiong, Yves Martin, Jason S. Orcutt, Marwan Khater, Laurent Schares, Tymon Barwicz, Nathan Marchack, Swetha Kamlapurkar, Sebastian Engelmann, Gerard Wysocki, Norma Sosa, William M.J. Green

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

3 Scopus citations


We present a portable optical spectrometer for fugitive emissions monitoring of methane (CH4). The sensor operation is based on tunable diode laser absorption spectroscopy (TDLAS), using a 5 cm open path design, and targets the 2ν3 R(4) CH4 transition at 6057.1 cm-1 (1651 nm) to avoid cross-talk with common interfering atmospheric constituents. Sensitivity analysis indicates a normalized precision of 2.0 ppmv·Hz-1/2, corresponding to a noise-equivalent absorbance (NEA) of 4.4×10-6 Hz-1/2 and minimum detectible absorption (MDA) coefficient of αmin = 8.8×10-7 cm-1·Hz-1/2. Our TDLAS sensor is deployed at the Methane Emissions Technology Evaluation Center (METEC) at Colorado State University (CSU) for initial demonstration of single-sensor based source localization and quantification of CH4 fugitive emissions. The TDLAS sensor is concurrently deployed with a customized chemi-resistive metal-oxide (MOX) sensor for accuracy benchmarking, demonstrating good visual correlation of the concentration time-series. Initial angle-ofarrival (AOA) results will be shown, and development towards source magnitude estimation will be described.

Original languageEnglish (US)
Title of host publicationChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX
EditorsChris R. Howle, Jason A. Guicheteau, Augustus Way Fountain
ISBN (Electronic)9781510617698
StatePublished - 2018
EventChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX 2018 - Orlando, United States
Duration: Apr 16 2018Apr 18 2018

Publication series

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


OtherChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX 2018
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

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


  • Absorption spectroscopy
  • angle-of-arrival
  • diode laser
  • fugitive emissions
  • infrared
  • methane
  • natural gas
  • source estimation


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