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Hyperspectral lidar system for aerosol scale spectrum measurement

A technology of laser radar and aerosol, which is applied in the field of atmospheric science, can solve the problems that cannot meet the characteristics of atmospheric aerosol, and achieve the effect of stable detection results, wide detection range and accurate detection

Active Publication Date: 2019-07-23
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection data of the existing single-wavelength lidar can only reflect the characteristics of aerosols at a specific scale. Therefore, single-wavelength lidar can no longer meet the requirements of large-scale research on the characteristics of atmospheric aerosols.

Method used

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  • Hyperspectral lidar system for aerosol scale spectrum measurement
  • Hyperspectral lidar system for aerosol scale spectrum measurement
  • Hyperspectral lidar system for aerosol scale spectrum measurement

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, the present invention is used for a hyperspectral laser radar system for aerosol scale spectrum measurement, which mainly includes a laser radar transmitting system, a spectroscopic system, a receiving system and a main control system.

[0027] The laser radar transmitting system includes a laser, a frequency doubling crystal, a frequency doubling crystal, and a first total reflection mirror.

[0028] The receiving system includes a telescope, a pinhole, a first converging lens, and a second total reflection mirror.

[0029] The spectroscopic system includes a first dichroic filter, a second dichroic filter, a third dichroic filter, a first narrow-band interference filter, a second narrow-band interference filter, a third narrow-band interference filter, a polarizing beam splitter, λ / 4 wave plate, FP etalon, second convergi...

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Abstract

The invention discloses a hyperspectral lidar system for aerosol scale spectrum measurement. The system uses fundamental frequency light generated by an Nd:YAG laser transmitter to emit lasers with the wavelengths being 355 nm, 532 nm and 1064 nm through a double-frequency-doubling crystal and a triple-frequency-doubling crystal correspondingly, and laser beams with the multiple wavelengths enterthe atmosphere at the same time; and then reflected light with the wavelengths of 355 nm, 532 nm and 1064 nm in an atmospheric reflection echo is separated through a telescope, a color separation filter and a narrow-band interference filter, rayleigh scattering signals of atmospheric molecules and aerosol meter scattering signals are separated by passing through different light paths of the separated reflected light, and hyperspectral lidars can accurately detect the physical properties and temporal and spatial distribution of the reflected light with the various wavelengths.

Description

technical field [0001] The invention belongs to the field of atmospheric science, and in particular relates to a detection method for aerosol scale spectrum measurement based on hyperspectral laser radar. Background technique [0002] In a broad sense, atmospheric aerosols refer to various non-gaseous particles suspended in the atmosphere with a diameter of less than 100um, such as smoke, dust, microorganisms, sulfates, nitrates, etc. Atmospheric aerosols have great impact on light transmission, environment, climate and human health. For example, it can affect the surface temperature by absorbing and scattering the sun; secondly, aerosols act as cloud condensation nuclei in the process of cloud formation, which can change the ability of clouds to absorb and reflect solar radiation, and affect the optical properties of clouds, cloud amount, and cloud life. Affect precipitation; once again, a large amount of coal combustion and industrial waste gas emissions produce a large a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95G01S7/481G01S7/483G01S7/484
CPCG01S17/95G01S7/4814G01S7/483G01S7/484Y02A90/10
Inventor 卜令兵刘娟
Owner NANJING UNIV OF INFORMATION SCI & TECH
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