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Kenji Kuriyama et al. set out to measure atmospheric concentrations of CO2 using the differential optical absorption spectroscopy (DOAS) method to the near-infrared spectral region in order to assist with the global effort in cutting greenhouse gas emissions. Infrared and near-infrared (NIR) absorption of CO2, CH4, and other trace molecular species is the leading cause of the global warming effect. The various species located in the lower troposphere can be monitored effectively using DOAS in the visible spectral range. The DOAS method measures atmospheric pollutants by measuring absorption and light scattering over a light path of a few kilometers.
Prior to obtaining measurements on an atmospheric scale, Kenju Kuriyama et al. produced and measured in lab tests which utilized a tungsten lamp and a CO2 sample cell. The absorption measurement of CO2 was conducted by passing a 100 W beam of light from a tungsten lamp through a quartz pipe 30 mm in diameter and 1000 mm length containing CO2 gas at a pressure of 1 atm. The light was detected by an InGaAs NIR detector in the wavelength re...

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