Device and method for automatically matching laser radar receiving and transmitting optical axes

Abstract

The invention provides a device and a method for automatically matching laser radar receiving and transmitting optical axes. The device comprises an emergent light path, a receiving light path and a data acquisition and control portion, an emergent system comprises a laser, a beam expanding system, a plurality of reflecting mirrors and lenses, laser light is emitted to air through the beam expanding system, the lenses, the reflecting mirrors and an optical antenna, a receiving system comprises a telescope, echo signals sequentially pass an optical fiber, the lenses, a light filter and a photoelectric detection element, the photoelectric detection element is arranged at an input end of a data acquisition system, and an output end of a control system controls the optical antenna with a high-accuracy servo motor through a motor driving controller. The method automatically traces the echo signals by the aid of a program design two-dimensional spiral scanning algorithm, uniaxial scanning and matrix scanning are performed to obtain the best emitting antenna position, so that an emitting antenna points to and receives collimation of the optical axis of the telescope, operators no longer need rich experience, and the method is simple and convenient to operate and high in feasibility.

Description

technical field [0001] The invention relates to the technical field of collimation systems, in particular to a laser radar receiving and receiving optical axis automatic matching device and method, which can automatically track echo signals and an automatic collimation system for two-dimensional rectangular scanning. Background technique [0002] At present, in order to detect the temperature and wind speed of the mesotope atmosphere, resonant fluorescence lidar is often used. It uses the resonant fluorescence scattering echo signal of the metal atomic layer at an altitude of 80-105km to detect the atmospheric temperature and wind field information in this altitude area. It mainly emits a laser with a very narrow ray width, uses the fluorescence spectral lines of metal atoms, and retrieves the atmospheric temperature and wind field by detecting the fluorescence signals at different positions of the spectral lines. [0003] In any laser radar system, it is necessary to ensur...

AI Technical Summary

Problems solved by technology

Here we use the echo signal method, its main advantage is that it can accurately scan the actual change of the echo signal intensity caused by the offset of the emission optical axis, the main disadvantage is that the collimation accuracy is affected by weather conditions and signal-to-noise ratio , not suitable for collimation in cloudy weather

However, for LiDAR systems, data observations are generally not possible when there are clouds

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