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 CO
2 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 CO
2 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.
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