Method for measuring horizontal visibility based on CCD (Charge Coupled Device) laser radar

Abstract

The invention discloses a method for measuring atmospheric horizontal visibility based on a CCD (Charge Coupled Device) laser radar. The method involves the following devices: a laser transmitting part, an optical receiving part and a data collecting part, wherein the laser transmitting part comprises a laser device and a collimator; the optical receiving part mainly comprises a CCD camera and an optical filter, and the optical filter is positioned in front of a lens of the CCD camera; the data collecting part comprises a computer, and the CCD camera is in communication connection with the computer; and the laser device is used for transmitting laser to the atmospheric air horizontally, a laser path is free from blocking objects, a micro angle is formed between the CCD camera and the laser device, laser echo signals are fully received by the CCD camera, and the atmospheric horizontal visibility can be obtained after laser echo images are collected and processed by the computer. According to the invention, the devices involved in the method can continuously work day and night and have the advantages of high detecting speed, simple structure, small size, light weight, convenience for carrying and moving and wide application prospect.

Description

technical field [0001] The invention relates to the field of laser detection, in particular to a method for detecting atmospheric horizontal visibility by using a CCD laser radar. Background technique [0002] Atmospheric visibility is a parameter describing atmospheric turbidity. The American Meteorological Society defines it as the maximum distance at which observers can see and recognize a moderately sized black target near the ground with fog or sky as the background under normal vision conditions; Maximum distance to and recognition of light of moderate intensity. [0003] The measurement of visibility can be divided into two categories: visual measurement and instrumental measurement. Visual observation is mainly to identify fixed targets at different distances by trained and experienced observers, which is related to the observer, the physical condition of the observer at that time, and the distance resolution of the target object, so the observed visibility value i...

AI Technical Summary

Problems solved by technology

There are three deficiencies in the following aspects: firstly, the system is more complex, larger in size, heavier in weight, difficult to move and transport, which limits its scope of application; secondly, it is expensive; thirdly, photodetectors such as avalanche tube photodiodes, photoelectric The low quantum efficiency of the multiplier tube leads to a long single measurement time (generally greater than 3 minutes)

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