Abstract
An infrared laser long path absorption experimental system has been developed using a dyelaser pumped by an Nd: YAG laser and a hydrogen Raman shifter. The accuracy of the measurement system was evaluated by CO2 absorption experiment using an open path in the laboratory and a long-path cell. The measurement error was estimated at less than 0.5 percent in a 10-minute measurement, indicating that the accuracy was high enough for observing diurnaland seasonal variations in CO2 concentration. From the systematic analysis of the measurement errors, the kind of error limiting the system performance was identified. A method for further improvement of the measurement accuracy was investigated.
