Figure 12.

(a) LiDAR FMU and real measured TDS obtained from the surface of a 3%-reflective plate placed at $15.3$ $\mathrm{m}$ without fog. The target peaks and noise levels match well. (b) LiDAR FMU and real measured TDS obtained from the surface of a 3%-reflective plate at $15.3$ $\mathrm{m}$ with a fog visibility V of 140 m. It should be noted that the relative distance is calculated from the internal reflection to the target peaks.