UVTRAN: An Ultraviolet Transmission and Lidar Simulation Model

UVTRAN is a user friendly, ultraviolet and visible wavelength, propagation and lidar model. The computer program is available as both a generic FORTRAN code and as a mighty interactive Visual Basic Ver. 3, MS Windows. The transmission code currently uses a modified Koshmeider aerosol model for the aerosol attenuation. It uses a modified Rayleigh scattering model for the attenuation due to molecular scattering, and it uses average molecular absorption data for ozone, oxygen and trace gas attenuation. The wavelength range is 200 to 700 nm. The principle inputs are: range in kilometers, visibility in kilometers, and wavelength in nanometers. Other inputs are: gas concentration in parts per billion, the wavelength interval for calculations, and the range information (starting and ending ranges), and the interval for the range calculation. Default values are built into the model if the user does not know sensible values to use. The last values used in a calculation are saved and can be reused for the next calculations. A 1976 standard atmosphere is used for gas concentration but can be user defined. The Windows version of the program has plotting capability while the FORTRAN version allows the information to be printed to a data file and plotted externally. This version also has options for viewing and printing the date. The lidar model includes the UVTRAN model for the two-way atmospheric attenuation of the beam. The lidar model performs standard elastic back scattering calculations as a function of range, and it will also perform fluorescence lidar calculations. Inputs are the same for the UVTRAN model, but also include the likar inputs such as back scattering cross section (or fluorescence back scattering) and the lidar system parameters (wavelength, power, mirror size, system efficiency).Army Research Lab White Sands Missile Range Nm is the author of 'UVTRAN: An Ultraviolet Transmission and Lidar Simulation Model' with ISBN 9781423581703 and ISBN 1423581709.