Rainfall and snowfall automatic observation method based on parallel light large visual field

Abstract

Provided is a rainfall and snowfall automatic observation method based on a parallel light large visual field. Data is transmitted to a terminal computer and corresponding software modules through utilization of an optical unit, a linear array imaging sensor array, a data acquisition control unit and a transmission unit. The optical unit comprises a large visual field collimator and an imaging system. The collimator comprises a collimated light source, a diaphragm and a collimating lens set. A high-brightness light emitting diode (LED) light source or a semiconductor laser is adopted as the collimated light source, and even and stable parallel light is obtained through a piece of ground glass, the diaphragm and the collimating lens set. An imaging camera lens is arranged in front of the outgoing end of the collimator, receives the parallel light emitted from the collimator, and projects the parallel light on a linear array imaging sensor after the parallel light is optically enlarged. The shape, the equivalent size, the falling end speed and other information of a single rainfall grain can be obtained, and therefore automatic identification of rainfall phenomenon and calculation of statistical characteristics of rainfall micro-physical parameters can be achieved.

Description

technical field [0001] The invention relates to a meteorological observation method for automatic observation of surface weather phenomena, in particular to a method suitable for automatic measurement of precipitation and snowfall phenomena. Background technique [0002] The phenomenon of precipitation and snowfall refers to a weather phenomenon in which liquid, solid or mixed hydrometeors (frozen) fall from the sky to the ground. Such weather phenomena are closely related to human life. For example, the uneven distribution of precipitation in time and space will cause drought and flood disasters. Short-term heavy precipitation may cause mudslide disasters in some areas; continuous heavy snowfall will cause large-scale traffic paralysis and lead to agricultural failure. or severely reduced production. In the study of global hydrothermal cycle and climate change, precipitation data is one of the main meteorological data. In addition, precipitation observation data can be us...

AI Technical Summary

Problems solved by technology

Image acquisition technology has its unique advantages in optical measurement technology, which can provide the shape and oscillation characteristics of a single precipitation particle, such as the two-dimensional video precipitation measurement instrument (Two-Dimensional Video Disdrometer, 2-DVD) developed by Schonhuber et al. D. Baumgardner developed a two-dimensional video precipitation measuring instrument (Meteorological particle Sensor, MPS) based on the principle of parallel light occlusion imaging. The minimum resolution can reach 0.05mm, but its sampling area is only 200mm*3.2mm, the detection ability of large particles is weak, and it cannot provide the full range of precipitation particle spectrum information

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