- “As long as the lidar is turned on, you can see the distribution of pollution sources.” On April 10, in a CMB car in the courtyard of the Shijiazhuang City Environmental Prediction and Forecasting Center, the staff turned on the laser pointer radar device and approached The three-dimensional distribution of pollution within 15 kilometers from the ground to the altitude will be continuously displayed on the screen. This is the first time that an on-board lidar has been used to accurately detect urban air pollution through navigation.
On April 10, a normal-looking CMB car was parked in the courtyard of the Municipal Environmental Prediction and Forecast Center, and the door was opened, but “hidden mystery”: 3D visible laser radar, computers and other equipment were placed in the vehicle. Visible green light with human eye safety certification will be emitted immediately through the roof sunroof. After 20 seconds, the computer began to continuously display the three-dimensional distribution of pollution within 15 kilometers from the ground. “This is a vehicle-mounted lidar equipment.” Shi Yanshuo, an engineer of the Municipal Environmental Forecasting and Forecasting Center, said that unlike previous monitoring, this monitoring method is macroscopic, large-scale and large-scale. “For example, in this kind of sand and dust weather, you can see the distribution of high-altitude pollutants in the provincial capital.” While pointing at the changing map on the screen, he explained: “Look, the monitoring data now shows that high-altitude 1. The value between 5 km and 3 km is the highest, showing red, while the relative value below 1 km below the ground is not high, showing yellow or orange. This shows that the pollutants are mainly concentrated in the mid-to-high altitude range, which is Dust generated near the ground is not obvious for pollution sources transported from other places. “He said that this way we can intuitively distinguish the main source of pollution from the provincial capital pollution this time.
The vehicle-mounted laser pointer radar can perform fixed-point vertical monitoring, fixed-point horizontal monitoring, and sailing monitoring of air quality. “Up to 25-30 kilometers can be monitored in the vertical direction at the highest distance; horizontal directions can be monitored within a radius of 8 kilometers for precise latitude and longitude positioning; using a vehicle, the laser radar can easily move everywhere to find the source of pollution.” With this device, you can monitor the changes in the concentration of pollutants in real time from vertical and horizontal angles, “said Wang Wei, director of the Forecast and Analysis Section of the Municipal Environmental Forecasting Center. In addition, this method can make up for the dead spots caused by satellite remote sensing monitoring that cannot penetrate the clouds and insufficient visible light at night, so that regional haze control will be more accurate and convenient.
“The joint application of satellite remote sensing and lidar navigation can monitor Shijiazhuang city at all weathers and from multiple angles.” Wang Wei said that by quickly locating the source of regional atmospheric pollution, it will help achieve the “measurement-management-government” linkage Provide new methods and technologies for the scientific management of air pollution.