Laser radar set with high spectral resolution

Abstract

The invention discloses a laser radar set with high spectral resolution. After a frequency locking system frequency-locks an expanded-field-based Michelson interferometer filter to a single-frequency polarized pulse laser, beams emitted by the single-frequency polarized pulse laser are reflected to detected atmosphere by reflectors a and b after passing a beam expander; after the beams are scattered by atmospheric molecules and aerosol particles, laser radar echo signals are generated; the laser radar echo signals are collected by a telescope; after sky background radiation is filtered by an optical filter, the signals are split by a beam splitter; one signal is reflected into a photoelectric detector a, and the other signal penetrates a polarizing splitter prism b before being divided into two; S-polarized signals are reflected into a photoelectric detector b, and P-polarized signals penetrate a high spectra resolution filer; the P-polarized signals passes the expanded-field-based Michelson interferometer filter to be received by a photoelectric detector c. The laser radar set with high spectral resolution is free of wavelength limitation, has large visual angle and is highly capable of searching laser radar echo signals.

Description

technical field [0001] The invention belongs to the technical field of laser radar, in particular to a laser radar device with high spectral resolution. Background technique [0002] In atmospheric detection, the atmospheric backscattered light received by lidar includes the Rayleigh scattering signal of atmospheric molecules with a wide spectral width and the Mie scattering signal of aerosol particles with a narrow spectral width. Since both Rayleigh and Mie scattering are elastic, their central spectra overlap with the LiDAR emission spectrum. High spectral resolution lidar uses the characteristics of aerosol scattering spectrum width different from other scattering spectra, and separates meter scattering and Rayleigh scattering spectra from atmospheric scattering through filters with high spectral resolution, and then inverts atmospheric parameters. Optical filters with high spectral resolution are one of the core technologies of high spectral resolution lidar. At prese...

AI Technical Summary

Problems solved by technology

Therefore, the current high spectral resolution lidar based on the Fabry-Perot interferometer filter is mainly used in the short-wavelength region of the ultraviolet and near-ultraviolet. In ordinary visible light, the signal-to-noise ratio is very poor, so it is rarely used, and in the longer waveband Due to the poor signal-to-noise ratio in the near-infrared region, it has not been reported yet

Images