Scattering Signal Error Analysis of Atmospheric Carbon Dioxide Detection by Raman Lidar

Because the Raman lidar scattering signal of detecting the atmospheric carbon dioxide is very weak, it is important to analyze the signal errors effectively. The method was described from the theoretical analysis to calculate the errors of Raman lidar scattering signal. Moreover, the mixing ratio of the carbon dioxide concentration signal was deduced. The three factors that influence the Raman signals errors were obtained and each factor was calculated theoretically. The signal errors were verified by the experiment data. Comparing the theoretically results with the experiment data, it is shows that the data error caused by the signal acquisition process is less than 10% and increases with the increasing distance; the atmospheric transmittance relative function error is less than 2% and the calibration constant error is less than 5%.