LED mini-lidar has improved to observe the lower atmosphere and the surface atmosphere in daytime and nighttime with the same signal-to-noise ratio as the LED light source of DUV 265nm wavelength is installed. In this study, we discuss how small the optical power is required for the near range observation. The signal-to-noise ratio is controlled by the pulse repetition frequency and the accumulation time with the small transmitting optical power. As it is in solar blind area, it can be accomplished up to the detection limit of the lidar echo signal. We considered it experimentally and theoretically.
Surface atmosphere has the small and steep spatiotemporal dynamics. It is influenced by the ground / sea-surface conditions, their up and down, air current, and so on. It greatly affects to the human living space. 265nm LED mini-lidar is developed to observe the surface atmosphere. As the transmitting light is in solar blind region, it can monitor near-range atmosphere up to 100m in daytime with the same signal-to-noise ratio in nighttime.
The lidar echo detection was evaluated under the solar illumination. It is confirmed that the enough signal-to-noise ratio is obtained in daytime, which is matched with the theoretical estimation. The surface atmosphere observation is simulated with the artificial fog / rain facility “Light Tunnel”. Fog flow and rainfall were visualized and analyzed with time series lidar echoes. We will propose the easy-to-use method for dynamics monitoring of surface atmosphere.
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