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Observation method for small-scale turbulence in cloud

A small-scale, turbulent technology, applied in the field of cloud physics, can solve the problems of low sampling frequency and single measurement parameters, achieve high sampling frequency and improve theoretical understanding

Pending Publication Date: 2021-06-18
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide an observation method for small-scale turbulence in clouds, which solves the problems of low sampling frequency and single measurement parameters in the prior art when observing turbulence in clouds

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  • Observation method for small-scale turbulence in cloud
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  • Observation method for small-scale turbulence in cloud

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] The present invention proposes an observation method for small-scale turbulence in clouds, which is specifically implemented according to the following steps:

[0040] Step 1, using the collimated and expanded laser to illuminate the cloud particles in the cloud;

[0041] The collimation and beam expansion function is realized by the laser 1 and the collimation lens 2. The laser can be a solid, gas or semiconductor single-frequency laser, and the laser wavelength can be any wavelength in the visible light band; the collimation lens can be a spherical surface or an aspheric surface of different glass materials. single lens or lens group; cloud 3 can be cloud or mist; the digital hologram of moving cloud particle in cloud is enlarged by microscopic objective lens 4, is collected by high-speed camera 5; high-speed camera is CCD or CMOS; ...

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Abstract

The invention discloses an observation method for small-scale turbulence in cloud. The method comprises the following steps: illuminating cloud particles in a cloud cluster by using collimated and expanded laser; continuously sampling a digital hologram of moving cloud particles in a cloud cluster by using a high-speed camera, and obtaining two-dimensional complex amplitude distribution with a zr reproduction distance on a reconstruction plane in the digital hologram by using a numerical reconstruction algorithm; sequentially reconstructing different distances for the digital hologram to obtain the number, three-dimensional space distribution and particle size of all cloud particles in a sampling interval, obtaining the three-dimensional displacement of the cloud particles after continuous shooting of the high-speed camera, and obtaining the three-dimensional speed of the cloud particles in combination with the sampling time; judging the particle following property according to the particle size and turbulence frequency of the cloud particles; and according to the three-dimensional instantaneous speed of the airflow field in the cloud cluster, obtaining a turbulent flow field speed variance, turbulent flow intensity and average turbulent flow kinetic energy. The observation method for small-scale turbulence in the cloud solves the problems of low sampling frequency and single measurement parameter during observation of turbulence in cloud in the prior art.

Description

technical field [0001] The invention relates to the technical field of cloud physics, in particular to an observation method of small-scale turbulence in clouds. Background technique [0002] Turbulence is formed by the superimposition of many eddies of different sizes in the cloud, and these eddies change rapidly and develop unpredictable trends. At the same time, clouds are the main source of uncertainty in climate simulations, and it is difficult to use models to accurately parameterize their microscopic physical processes, such as wind speed and temperature fluctuations in clouds. The early observation method was to use slow-response instruments such as wind cups. At present, the wind speed fluctuation component of high-altitude turbulent flow can be collected by ultrasonic anemometer, or the temperature fluctuation of turbulent flow can be detected by the fast-response platinum wire temperature fluctuation meter. However, the data obtained by these instruments are only...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01W1/02
CPCG01W1/02Y02A90/10
Inventor 王骏高攀华灯鑫
Owner XIAN UNIV OF TECH
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