Methods of Monitoring Visibility by Meteorological Bureau

Most monitoring stations of domestic meteorological bureau use visual inspection to select reference objects. After positioning and measuring with GPS, the visual reference is used to determine the visual distance. . .

There are also observation stations that choose visibility observation instruments, which are rarely used, mainly in the experimental stage. The principle is to determine the change of visibility, how many beams are emitted and received, and how much the ion concentration in the air is hindered by two opposite apertures. China is in the research and development stage, and the chip processing of the core part of the instrument is imported from abroad, Finland and Germany. . . .