Design And Application Of Data Acquisition Platform For Visibility Monitoring In Zhongshan City

Visibility is an index for reflecting atmospheric transparency,and the change of visibility directly reflect the quality of atmospheric environment is good and bad,is also an important sign of particulate pollutants in the air changes.It is of great significance to study the changes of atmospheric visibility and its influencing factors and to take measures to prevent and improve traffic safety,improve the quality of atmospheric environment and prevent and reduce disaster in urban areas.Visibility measurement method is divided into artificial visual method and instrument measurement method.Artificial visual method is mainly to use the human eye to determine the most distant visible objects to determine the current visibility.The aerosol sampling,photographic method(digital camera),optical method(transmission visibility meter,scattering visibility meter and lidar)were measured.With the development of monitoring technology,the Scalable Visitor is gradually becoming the mainstream visibility monitoring method with low cost of distribution.Thanks to the development of wireless communication technology,the monitoring data in the network coverage area can be improved wirelessly to the central host.On the basis of systematically expounding the theory of atmospheric visibility monitoring and comparing the advantages and disadvantages of various measurement methods,this paper puts forward the design scheme of data acquisition and analysis platform for visibility monitoring data of Zhongshan City based on the scattering visibility meter.The system is composed of five visibility monitoring sub-stations and one visibility center station.The visibility monitoring is composed of forward-scattering visibility meter,data acquisition system(including data wireless transmission module),solar power supply system and support equipment,Central station by the database system and receive software components,the final monitoring data to provide access to the use of WEB services.This paper also shows the practical application value of Zhongshan Visibility monitoring data acquisition and analysis platform through a haze process in 2015.Combining with other meteorological elements,this paper analyzes the characteristics and causes of spatial distribution of visibility in the haze process.Finally,The reliability of the monitoring system of Zhongshan Visibility is verified,and the reason of the high efficiency and reliability of the whole system is verified.The reason of the low receiving rate of Dongfeng site is analyzed,and the direction of the next research is put forward.