Laser radar system is for measurement of speed in aerosol, preferably for wind measurement and comprises a laser which can be frequency-modulated and is capable of emitting unmodulatedly

摘要

The laser radar system (1) is for measurement of the speed in an aerosol, preferably for wind measurement and comprises a laser (11), which can be frequency-modulated. The laser is capable of emitting unmodulatedly, incorporating a device (12) capable of square wave frequency modulation of an emitted laser beam. The laser is used unmodulatedly for measuring the speed pattern and square wave frequency modulatedly for measuring the speed direction. The laser measures speed in at least three directions and the system uses a semi-conductor laser emitting on a wavelength of 1.55 micrometers. It also includes a function for discrimination between cloud/hard targets and aerosols by triangular wave frequency modulation of a beam (2) emitted from the laser.