Abstract
We demonstrate a new technique for spatial mapping of multiple atmospheric gas species. This system is based on high-precision dual-comb spectroscopy to a retroreflector mounted on a flying multi-copter. We measure the atmospheric absorption over long open-air paths to the multi-copter with comb-tooth resolution over 1.57 to 1.66 pm, covering absorption bands of CO2, Cm, H2O and isotopologues. When combined with GPS-based path length measurements, a fit of the absorption spectra retrieves the dry mixing ratios versus position. Under well-mixed atmospheric conditions, retrievals from both horizontal and vertical paths show stable mixing ratios as expected. This approach can support future boundary layer studies as well as plume detection and source location.
Highlights
We demonstrate a new technique for spatial mapping of multiple atmospheric gas species
This system is based on high-precision dual-comb spectroscopy to a retroreflector mounted on a flying multi-copter
Unlike differential absorption LIDAR [17,18], which measures the atmospheric absorption at only a few laser frequencies, dual frequency comb spectroscopy (DCS) measures the spectrum at many tens of thousands of individual frequencies with eye-safe near-infrared laser light [19,20]
Summary
We demonstrate a new technique for spatial mapping of multiple atmospheric gas species. This system is based on high-precision dual-comb spectroscopy to a retroreflector mounted on a flying multi-copter. We measure the atmospheric absorption over long open-air paths to the multi-copter with comb-tooth resolution over 1.57 to 1.66 pm, covering absorption bands of CO2, Cm, H2O and isotopologues.
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