Atmospheric ultraviolet transmission and Lidar returns

The atmospheric transmission model UVTRAN is modified by use of molecular absorption cross sections taken from Hitran2004 database. The modified UVTRAN can be utilized to calculate atmospheric transmission with both high accuracy and super spectral resolution. It can replace FASCOD3 model because the current FASCOD3 for micro-computer can not be used in the ultraviolet spectrum. As an example, atmospheric transmissions and return signals are calculated by the modified UVTRAN for the 6 laser wavelengths at visible and ultraviolet spectrum. The results show that the laser wavelength at medium ultraviolet, e.g. 308nm XeCl Excimer laser, is suitable for working at short distance in the troposphere. The ultraviolet detector with very high sensitivity is required if a laser is chosen to work in deep ultraviolet.