Airborne Carbon Dioxide (CO2), Methane (CH4), Carbon Monoxide (CO), and Water Vapor (H2O) Instrument

The Picarro G2401-mc utillzes wavelength scanned cavity ring down spectroscopy, a technique wherein the exponential decay of optical extinction within a resonant cavity is modified by molecular absorption. This decay time is called a ring-down time. Over a specific wavelength range, ring-down times are proportional to the concentration of the absorbing species. The figure below shows a schematic of the instrument design on the left and typical time series traces on the right.  

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