RU1345861C - Multiwave lidar for sounding atmosphere - Google Patents

Abstract

The invention can be used for remote measurements of the optical and microphysical parameters of the atmosphere. The purpose of the invention is noBboneiAle of efficiency and accuracy of measurements by increasing the number of simultaneously measured parameters. In the focal plane of the receiving lens O, there are installed apertures with detectors P, the number of which n is equal to the number of laser sources U of radiation. As a result, a p-petal radiation pattern of the lidar antenna is formed, the role of which is the receiving lens O. The optical axis of each source U is located in the plane passing through the optical axis of the receiving lens O and the center of the corresponding detector, and is rotated relative to the axis of the lens O by a certain angle (f. The center of each diaphragm with a detector with prot the opposite side of the corresponding laser source to the optical axis of the receiving lens at a certain distance ensures that the ith detector P receives scattered radiation only from the ith source Uj. The electrical signals from the detectors are fed to the corresponding channels of the recording unit. limits within which the angle is selected (. 1 ill. with w 4; eat 00 05

Description

1

The invention relates to techniques for optical sensing of the atmosphere and can be used in the field of meteorology, atmospheric optics and environmental protection for remote measurements of the optical and microphysical parameters of the atmosphere.

The purpose of the invention is to increase the operability and accuracy of measurements by increasing the Number of simultaneously measured parameters.

The drawing shows a diagram of a multiwave lidar for atmospheric sounding (for the case of five wavelengths of the probed radiation).

The multiwave lidar contains laser radiation sources U ,, ..., U, a receiving lens O, diagrams D ,,,., D, with detectors F,..., F and a registration unit (not shown in the drawing).

The new wave lidar for atmospheric sounding works as follows

way. 1

The radiation of, for example, the first emitter (indicated by a dashed arrow) is scattered by the components. The scattered radiation is collected and focused by the lens and the region of the first diaphragm, the role of which is to cut off the radiation coming from other directions, in particular the radiation of the background and scattered at angles other than tSO, the radiation of other emitters, Further, the scattered The radiation of the first emitter enters the sensitive area of the photodetector, is converted into an electric signal, which enters the first channel of the five-channel recording system. The other four channels of the lidar work similarly. The meaning of the arrangement of the elements of the device is that the placement in the focal plane of the receiving lens of n apertures forms a p-petal radiation pattern of the lidar antenna, the role of which is played by the lens. The mutual arrangement of the diaphragms in the laser radiation sources is such that the lobe formed by the i-th diaphragm crosses the radiation pattern of only one corresponding to this i-ro diaphragm

10

-

13A58612

laser light source. As a result, the ith detector receives scattered radiation from only the ith laser source.

The present invention allows to significantly reduce the size of the lidar in comparison with multi-objective analogues of multi-frequency lidar and at the same time reduce its cost.

Claims (1)

The claims A multi-wave lidar for sensing the atmosphere, containing laser radiation sources, a receiving lens, in the focal plane of which there is a diaphragm with a detector, the output of which is connected to the recording unit, which is distinguished by the fact that, in order to increase the efficiency and accuracy of measurement, in the focal plane additional diaphragms with detectors are installed in the receiving lens, the total number of which is equal to the number of laser radiation sources, while the outputs of the additional diaphragm detectors are connected to the block EGISTRATION, the optical axis of each of the laser sources of radiation located in a plane extending Tsey through an optical receiving lens axis and the center of the detector corresponding to the laser source, wherein the optical axis of the laser of: source of radiation is rotated in said plane from the optical axis of the receiving lens at an angle y, Max lying in limits from -gt- to 6d ,,, m -gtu-, and the center of the diaphragm with the detector is located at a distance from the side of the optical axis of the receiving lens opposite to the laser radiation source P f tRV, where n is the number of laser radiation sources; largest aperture diameter; smallest aperture diameter; diameter of the receiving lens; focal length of the lens. / "QKe  min A f / fff J. 6d cf /. L ± i / ////////// yj I I  cf /. L ± i / ////////// yj  , O Compiled by V. Dosov Relactor N. Fedorova Tehred M. Hodannch Corrector V. But ha Order 1958; Circulation Subscribed HIGHLIGHT of the USSR State Committee for affairs of inventions and discoveries 113035, Moscow, Zh-35, Rauska nab., d. 4/5 Production and printing company, Uzhgorod, st. Projectna, 4