Picarro Instrument for Airborne Measurement of Carbon Dioxide (CO2) Carbon Monoxide (CO) Methane (CH4) and Water Vapor (H2O)

Wavelength scanned cavity ring down spectroscopy is 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.