Compact laser radar system

Abstract

An airborne compact wind laser radar system (1) is disclosed. The system comprises a laser (10) capable of emitting a laser beam (4), an optical system (5) adapted to form the laser beam (4) emitted by the laser and an optical window (3) transparent to laser radiation emitted by the laser, and is characterized by comprising a first prism (6) and a second prism (7), wherein the first prism is fixedand configured to deflect the laser beam formed by the optical system (5), the second prism is mounted on a rotating device (8), and the rotating device is configured to perform rotation about a propagation axis of the laser beam transmitted by the first prism, so that the laser beam deflected by the second prism passes through the optical window (3) by forming a non-zero angle with the normal ofthe optical window; the angle between the optical axis of the optical system (5) and the normal is less than 10 degrees, the rotating device is driven by a circuit, and the circuit can orient the second prism in order to select the angle of the laser beam (4) through the optical window.

Description

technical field [0001] The invention relates to a wind lidar device designed for use in the aviation field. Background technique [0002] Keeping an aircraft in flight requires knowledge of a number of fundamental parameters, such as its relative altitude, its velocity relative to the surrounding air mass, and its angle of attack. [0003] Lidar wind measuring devices can measure relative air velocity, for example, at points located a small distance from the skin of an aircraft without the need for physical protrusions. Velocity measurements by wind lidar are based on measuring the frequency shift between a laser beam incident into the atmosphere and the beam backscattered by aerosols naturally present in the air according to the Doppler effect. [0004] figure 1 Denotes a wind lidar known in the prior art for aerial surveys. The lidar comprises a laser system 10 which can emit a laser beam 4 of a certain wavelength and which comprises an optical focusing system 5 adapted...

AI Technical Summary

Problems solved by technology

[0008] Finally, the internal inclination of the optical system 5 in the device 1 limits the compactness of the LIDAR device due to the spacing between the optical system and the optical window in order for the laser beam formed by the optical system to pass through the optical window, according to the propagation axis of the beam. between is required

[0009] All of these parameters significantly increase the cost of a wind lidar system

Images