laser system for measuring the anstellwinkels of an aircraft.

摘要

The system comprises at least one probe (1) comprising a laser generator (6), transmission optics (7, 8, 9, 10), optics (10, 9, 30) for receiving a radiation back-scattered by aerosols, means (3) of pumping the laser generator, a detection interferometer (4) receiving a portion of the transmitted laser beam and the back-scattered radiation and means (5) for, after beating of the transmitted and back-scattered beams, determining the Doppler shift of the back-scattered beam and from this deriving the air speed along the axis of the transmitted beam. The transmitted beam is focused on a section of air distant from the aircraft, the laser generator (6) is disposed in the vicinity of the skin of the aircraft, the pumping means (3) and the interferometer (4) are remotely installed in the aircraft and the frequency of the laser line is adapted such that the connections between the probe (1), on the one hand, and the pumping means (3) and the interferometer (4), on the other hand, are carried out by monomode optical fibres with maintained polarisation (13, 23; 17, 19, 20, 22). …IMAGE…