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Proceedings Paper

Localization and quantification of trace-gas fugitive emissions using a portable optical spectrometer
Author(s): 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
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Paper Abstract

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.

Paper Details

Date Published: 16 May 2018
PDF: 7 pages
Proc. SPIE 10629, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX, 106290Y (16 May 2018); doi: 10.1117/12.2305174
Show Author Affiliations
Eric J. Zhang, IBM Thomas J. Watson Research Ctr. (United States)
Chu C. Teng, Princeton Univ. (United States)
Theodore G. van Kessel, IBM Thomas J. Watson Research Ctr. (United States)
Levente Klein, IBM Thomas J. Watson Research Ctr. (United States)
Ramachandran Muralidhar, IBM Thomas J. Watson Research Ctr. (United States)
Chi Xiong, IBM Thomas J. Watson Research Ctr. (United States)
Yves Martin, IBM Thomas J. Watson Research Ctr. (United States)
Jason S. Orcutt, IBM Thomas J. Watson Research Ctr. (United States)
Marwan Khater, IBM Thomas J. Watson Research Ctr. (United States)
Laurent Schares, IBM Thomas J. Watson Research Ctr. (United States)
Tymon Barwicz, IBM Thomas J. Watson Research Ctr. (United States)
Nathan Marchack, IBM Thomas J. Watson Research Ctr. (United States)
Swetha Kamlapurkar, IBM Thomas J. Watson Research Ctr. (United States)
Sebastian Engelmann, IBM Thomas J. Watson Research Ctr. (United States)
Gerard Wysocki, Princeton Univ. (United States)
Norma Sosa, IBM Thomas J. Watson Research Ctr. (United States)
William M. J. Green, IBM Thomas J. Watson Research Ctr. (United States)


Published in SPIE Proceedings Vol. 10629:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX
Jason A. Guicheteau; Augustus Way Fountain; Chris R. Howle, Editor(s)

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