METHOD FOR ESTIMATING THE TRANSVERSE COMPONENT OF THE VELOCITY OF THE AIR IN A DOPPLER LIDAR MEASUREMENT

摘要

A method for estimating the transverse component Vtrans of the velocity of the air comprises the following steps: emitting a focused laser beam; acquiring an electrical signal resulting from the transit of a particle across the beam at a point of transit; analysing the signal so as to obtain a spectrogram revealing an elongate mark representative of the transit; estimating the duration of traversal of the laser beam by the particle and the slope of the mark; deducing from the duration and from the slope the distance between the point of traversal of the beam and the focusing point; determining the radius of the beam at the point of transit; deducing the transverse component from the radius and from the duration.

主权项

1. A method for estimating the transverse component Vtrans of the velocity of the air comprising the following steps:
emitting a focused laser beam; acquiring an electrical signal s(t) resulting from the transit of a particle across the beam at a point of transit; analysing the signal s(t) so as to obtain a spectrogram revealing an elongate mark representative of the said transit; estimating the duration D of traversal of the laser beam by the particle and the slope P of the mark; deducing from the duration D and from the slope P the distance z0 between the point of traversal of the beam and the focusing point; determining the radius ω(z0) of the beam at the point of transit; and deducing the transverse component Vtrans from the radius ω(z0) and from the duration D.