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

A laser radar and atmospheric technology, applied in the field of laser radar, can solve the problems of strong background interference, difficult to take into account the far-field detection height and near-field detection blind area, low-altitude detection blind area, etc., to achieve the effect of improving the detection ability

Inactive Publication Date: 2013-01-02
WUHAN UNIV
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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

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

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specific Embodiment approach

[0019] see figure 1 , the near-field coaxial dual-field-of-view meter-scattering atmospheric lidar provided in the embodiment mainly includes two parts: an optical system 1 and a photoelectric detection system 2 . The optical system 1 is used to emit 532nm pulsed laser light into the atmosphere, and receive backscattered echoes generated by atmospheric aerosols on the emitted laser pulses. The photoelectric detection system 2 is used to process the collected backscattered echo signals.

[0020] see figure 2 , the optical system 1 of embodiment is by laser generator 3, laser beam expander mirror 4, reflecting mirror 5, receiving telescope 6,7, field stop 8,9, collimator lens 10,11, transmission wavelength is the interference of 532nm Narrow band filter 12,13 is formed.

[0021] The optical system 1 of the embodiment includes a laser emitting subsystem that emits a 532nm pulsed laser beam into the atmosphere. The laser emitting subsystem consists of a laser generator 3, a l...

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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...

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Application Information

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IPC IPC(8): G01S17/95
CPCY02A90/10
Inventor 龚威李俊马盈盈毛飞跃张淼马昕
Owner WUHAN UNIV
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