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Open-path spectroscopic methane detection using a broadband monolithic distributed feedback-quantum cascade laser array
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DOI：10.1364/AO.56.000E23.png)
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Methane is a powerful greenhouse gas that has both natural and anthropogenic sources. The ability to measure methane using an integrated path length approach such as an open/long-path length sensor would be beneficial in several environments for examining anthropogenic and natural sources, including tundra landscapes, rivers, lakes, landfills, estuaries, fracking sites, pipelines, and agricultural sites. Here a broadband monolithic distributed feedback-quantum cascade laser array was utilized as the source for an open-path methane sensor. Two telescopes were utilized for the launch (laser source) and receiver (detector) in a bistatic configuration for methane sensing across a 50 m path length. Direct-absorption spectroscopy was utilized with intrapulse tuning. Ambient methane levels were detectable, and an instrument precision of 70 ppb with 100 s averaging and 90 ppb with 10 s averaging was achieved. The sensor system was designed to work off the grid and utilizes batteries that are rechargeable with solar panels and wind turbines. (C) 2017 Optical Society of America
Keyword:
ATMOSPHERIC METHANE
NITROUS-OXIDE
EMISSIONS
SPECTROMETER
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A
IF:
1.7
论文数:
1.0K
被引数:
5.1W
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Analysis and demonstration of atmospheric methane monitoring by mid-infrared open-path chirped laser dispersion spectroscopy.png)
OPTICS EXPRESS
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OPTICS EXPRESSIF3.3
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