Near field coaxial double-visual-field Mie scattering atmosphere lidar

Abstract

The invention relates to a near field coaxial double-visual-field Mie scattering atmosphere lidar which is characterized by comprising an optical system and a photoelectric detection system, wherein the optical system is used for launching a laser pulse bundle to the atmosphere and receiving a backward scattering echo produced by atmospheric aerosol to the launched laser pulse bundle; the photoelectric detection system is used for processing a backward scattering echo received by the optical system; and in the optical system, a laser launching system and two independent sets of optical receiving channels respectively adopt coaxial and non-coaxial sending and receiving designs, and the signal detection and collection simultaneously adopt a modulus detection and photon counting detection mode. According to the near field coaxial double-visual-field Mie scattering atmosphere lidar disclosed by the invention, the low altitude detection can adopt a large visual field angle and a coaxial system, the high altitude detection can adopt double modes of a small visual field angle and a non-coaxial system and photon counting and detection simulation, and therefore, the detection capability of a lidar system in a low altitude condition and a high altitude condition is enhanced, and the support is supplied for atmospheric boundary layer detection and stratosphere atmospheric aerosol detection.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a near-field coaxial dual-field-of-view meter-scattering atmospheric laser radar capable of measuring atmospheric aerosols. Background technique [0002] Atmospheric aerosols refer to various solid and liquid particles suspended in the atmosphere with a diameter less than 10 μm. Aerosols account for a small proportion in the atmosphere, but they have an important impact on the radiative transfer of the atmosphere and the water cycle. Lidar generates echoes by emitting laser beams and interacting with atmospheric aerosol particles, and the information on the extinction characteristics of aerosol particles can be obtained by analyzing and inverting the echo signals. Because the laser beam has the characteristics of small divergence, short wavelength, and high energy density, the use of lidar to detect atmospheric aerosols has the unique advantages of atmospheric layer detectio...

AI Technical Summary

Problems solved by technology

In order to expand the detection range of lidar, high and low-altitude layered detection can be carried out on the atmosphere. Some laser radars use spectroscopic mirrors to divide the signal into two channels, far and near, to achieve simultaneous layered detection. However, it is difficult to take into account the far field with a single field of view. Detection height and near-field detection blind zone, the larger the field of view, the stronger the background interference, and the smaller the field of view, the larger the low-altitude detection blind zone

The design of variable field of view alone cannot fundamentally solve this contradiction

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