Abstract
A simple and effective spectroscopic method based on earth-satellite-earth laser long path absorption measurements using RIS (Retroreflector-In-Space) on the ADEOS satellite, has been developed. This method utilize the Doppler shift of a reflected beam resulting from the satellite movement for measuring the atmospheric transmission spectra. The feasibility of a system using carbon dioxide lasers was evaluated by a computer simulation. The result shows that the vertical profiles of ozone, methane, and the column densities of CFC12, HNO3, CO and N2O can be measured by using the fundamental, second and third harmonics of TEA lasers with 12C16O2 and 13C16O2 isotopes. The signal-to-noise ratio of single shot optical detection is estimated to be 12-5000 depending on the satellite position for pulse energies of the fundamental, second and third harmonics of 100mJ, 10mJ, and 5mJ.
