Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 244, Issue -, Pages 365-372Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.12.146
Keywords
Infrared absorption; Laser spectroscopy; CH4 sensor; Interband cascade laser
Funding
- National Science Foundation (NSF) (ERC MIRTHE award)
- USA Robert Welch Foundation [C-0586]
- NSF Phase II SBIR [IIP-1230427DE DE]
- DOE ARPA-E award [DE-0000545, DE-0000547]
- National Natural Science Foundation of China (NSFC) [61627823, 61307124, 61575113, 61275213]
- Changchun Municipal Science and Technology Bureau [14KG022]
- High School Outstanding Young Teacher Training Program of Guangdong Province [YQ2015071]
- China Scholarship Council [201506175025, 201508440112]
Ask authors/readers for more resources
A mid-infrared methane (CH4) sensor without pressure control was developed using a continuous-wave (CW) interband cascade laser (ICL) for targeting a CH4 absorption line located at 3038.5 cm(-1). A multi-pass gas cell with an absorption path length of 54.6 m was utilized for enhancing gas absorption. The pressure inside the MPGC was measured using direct Lorentzian absorption fitting for the compensation of CH4 concentration changes resulting from pressure variations. Laboratory pressure calibration was conducted in the range of 25-800 Torr using 1.3-, 1.5-, 1.7- and 2.1-ppmv CH4 samples. A pressure precision of similar to 1.65 Ton with a similar to 2.5-s averaging time was achieved based on the measurement of a 2.1-ppmv CH4 sample at 700-Torr. Concentration level measurements of a 2.1-ppmv CH4 sample at a 700-Torr pressure yielded an Allan deviation of 2.25 ppbv for an averaging time of 2.5 s. The sensor functioned normally with CH4 samples at 1.0, 1.2, 1.4, 1.6 and 2.1 ppmv concentration levels as the pressure changes from 25 to 800 Torr. Indoor/outdoor CH4 concentration measurements on the Rice University campus and a field campaign in the Greater Houston Area (GHA) were conducted to evaluate the performance of the sensor system. (C) 2017 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available