Research on wavelength selection for UV ozone DIAL

Differential Absorption Lidar (DIAL) is an effective approach for measuring atmospheric ozone with high precision. To solve the problem of wavelength pair selection for DIAL, numerical simulation experiments of DIAL were carried out. Within the ultraviolet band of 220nm to 360nm, tests were conducted for each wavelength with an interval of 1nm, and wavelength combinations with differences of 5nm, 10nm, 20nm, 30nm, 40nm, and 50nm were tested. The feasibility and of different wavelength combinations in the band for ozone measurement were synthesisly evaluated. The experimental results show that for DIAL systems with wavelength differences of 5 nm, 10 nm, and 20 nm, the combined error of ozone measurements in the troposphere from 0 to 6 KM below 15% if the strong absorption wavelengths (λ_on) are selected in the range of 260 nm to 283 nm, and the synthesis error of ozone measurements in the stratosphere from 15 to 30 KM below 15% if λ_on are selected in the range of 305 nm to 315 nm. For DIAL systems with wavelength differences of 30nm and 40nm, the synthesis error of ozone measurements in the troposphere from 0 to 6 KM below 15% if λ_on are selected in the range of 254 nm to 270 nm, and the synthesis error of ozone measurements in the stratosphere from 15 to 30 KM below 15% if λ_on are selected in the range of 305nm to 312nm. For DIAL systems with a wavelength difference of 50nm, the synthesis error of ozone measurement in the troposphere at 0 to 6KM is higher than 15%, and the synthesis error of ozone measurements in the stratosphere from 15 to 30 KM below 15% if λ_on are selected in the range of 305nm to 311nm. This result serves as a reference for the selection of wavelength pairs for DIAL measurements of atmospheric ozone.