Abstract
A new laser long-path absorption spectrometer system between the earth and a satellite for monitoring trace species in the global atmosphere is proposed. The spectrometer satellite launched into the stationary orbit detects the multiple laser beams from the ground based laser stations simultaneously. The laser beams from ground stations are modulated by an Hadamard code. By this method each ground station can make long-path measurement independently. The minimum detectable optical density of 10-5 is achieved for each measurement. Most of the important trace species can be measured with sufficient accuracy if suitable laser sources are used.
