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Laser radar system and method for detecting cloud phase state and cloud water content

A technology of laser radar and laser emission system, which is applied in the field of detecting cloud phase state and cloud water content, and can solve the problems of lack of practicability, influence of detection performance, long wavelength, etc.

Pending Publication Date: 2021-06-04
XIAN UNIV OF TECH
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Problems solved by technology

The existing traditional polarization lidar system has a large uncertainty in identifying cloud phase state. Although some researchers use the method of adding Raman channel to assist in identifying cloud phase state and obtaining cloud water content, the detection performance is limited. Big impact, not practical
Millimeter wave radar can also detect clouds, but due to its long wavelength, it cannot observe small particles and early clouds

Method used

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  • Laser radar system and method for detecting cloud phase state and cloud water content
  • Laser radar system and method for detecting cloud phase state and cloud water content
  • Laser radar system and method for detecting cloud phase state and cloud water content

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The laser radar system for detecting cloud phase state and cloud water content of the present invention includes a laser emitting system, a receiving system, a polarization and spectrum analysis system and a data acquisition processor 21 .

[0036] The receiving system is the telescope 3 .

[0037] The laser emitting system includes a laser 1 and a first Slide 2, the optical axis of laser 1 is parallel to the optical axis of telescope 3, the first The included angle between the azimuth angle of the glass slide 2 and the horizontally vibrating polarized light emitted by the laser 1 is 45 degrees.

[0038] Laser 1 adopts Nd:YAG pulsed laser, and the emitted laser wavelengths are 355nm and 1064nm.

[0039] The polarization and spectrum analysis system comprises a collimating mirror 4 and a first dichroic mirror 5 which are sequential...

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Abstract

The invention discloses a laser radar system for detecting a cloud phase state and cloud water content. The laser radar system comprises a laser emitting system, a receiving system, a polarization and spectrum analysis system and a data acquisition processor. The detection method comprises the following steps: 1, detecting and obtaining four paths of atmosphere back scattering echo signal power, 2, calculating and obtaining a Raman method inversion extinction coefficient and an atmosphere back scattering circle depolarization ratio, 3, calculating an integral back scattering coefficient and an integral depolarization ratio of a cloud layer, and 4, judging the cloud layer condition and respectively calculating the cloud water content and the ice water content. According to the method, the cloud phase state is identified according to the depolarization ratio value and the extinction coefficient value, and high-precision identification of the cloud phase state and high-precision evaluation of the cloud water content are realized.

Description

technical field [0001] The invention belongs to the technical field of atmospheric detection, and relates to a laser radar system for detecting cloud phase state and cloud water content, and also relates to a method for detecting cloud phase state and cloud water content by using the laser radar system. Background technique [0002] Clouds are one of the most important factors affecting climate change. Clouds play an important role in the radiation budget, energy balance and water cycle of the earth-atmosphere system. Clouds have three different phases, and different cloud phases have different absorption and scattering characteristics. The identification and detection of cloud phases are always the core issues of cloud physics research. The radiation effect of clouds depends on the vertical structure and microphysical parameters of the cloud phase state. Analyzing the macro-micro-vertical structure characteristics and temporal and spatial changes of clouds is of great signi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/481G01S7/483G01S17/95
CPCG01S7/481G01S7/483G01S17/95Y02A90/10
Inventor 狄慧鸽华灯鑫袁云闫庆王玉峰宋跃辉
Owner XIAN UNIV OF TECH
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