Long-path quantum cascade laser–based sensor for methane measurements
Michel, Anna P. M.
Miller, David J.
Zondlo, Mark A.
MetadataShow full item record
KeywordArctic; North America; Greenhouse gases; In situ atmospheric observations; Instrumentation/sensors; Field experiments
A long-path methane (CH4) sensor was developed and field deployed using an 8-μm quantum cascade laser. The high optical power (40 mW) of the laser allowed for path-integrated measurements of ambient CH4 at total pathlengths from 100 to 1200 m with the use of a retroreflector. Wavelength modulation spectroscopy was used to make high-precision measurements of atmospheric pressure–broadened CH4 absorption over these long distances. An in-line reference cell with higher harmonic detection provided metrics of system stability in rapidly changing and harsh environments. The system consumed less than 100 W of power and required no consumables. The measurements intercompared favorably (typically less than 5% difference) with a commercial in situ methane sensor when accounting for the different spatiotemporal scales of the measurements. The sensor was field deployed for 2 weeks at an arctic lake to examine the robustness of the approach in harsh field environments. Short-term precision over a 458-m pathlength was 10 ppbv at 1 Hz, equivalent to a signal from a methane enhancement above background of 5 ppmv in a 1-m length. The sensor performed well in a range of harsh environmental conditions, including snow, rain, wind, and changing temperatures. These field measurements demonstrate the capabilities of the approach for use in detecting large but highly variable emissions in arctic environments.
Author Posting. © American Meteorological Society, 2016. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Atmospheric and Oceanic Technology 33 (2016): 2373-2384, doi:10.1175/JTECH-D-16-0024.1.
Suggested CitationArticle: Michel, Anna P. M., Miller, David J., Sun, Kang, Tao, Lei, Stanton, Levi, Zondlo, Mark A., "Long-path quantum cascade laser–based sensor for methane measurements", Journal of Atmospheric and Oceanic Technology 33 (2016): 2373-2384, DOI:10.1175/JTECH-D-16-0024.1, https://hdl.handle.net/1912/8640
Showing items related by title, author, creator and subject.
Neuronal calcium sensor-1 enhancement of InsP3 receptor activity is inhibited by therapeutic levels of lithium Schlecker, Christina; Boehmerle, Wolfgang; Jeromin, Andreas; DeGray, Brenda; Varshney, Anurag; Sharma, Yogendra; Szigeti-Buck, Klara; Ehrlich, Barbara E. (American Society for Clinical Investigation, 2006-06)Regulation and dysregulation of intracellular calcium (Ca2+) signaling via the inositol 1,4,5-trisphosphate receptor (InsP3R) has been linked to many cellular processes and pathological conditions. In the present study, ...
Hoyt, Joshua King (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1986-05)The Flying Fish is an autonomous, streamlined, gravity driven underwater vehicle of high speed (15 knots) vertical excursions to depths of 6000 meters. This prototype uses short baseline acoustic interferometry to guide ...
Mooney, T. Aran; Katija, Kakani; Shorter, K. Alex; Hurst, Thomas P.; Fontes, Jorge; Afonso, Pedro (BioMed Central, 2015-09-28)Soft-bodied marine invertebrates comprise a keystone component of ocean ecosystems; however, we know little of their behaviors and physiological responses within their natural habitat. Quantifying ocean conditions and ...