Fig. 1. Particle size distribution of smoke particles

Fig. 2. Efficiency factor curves of smoke particles at the wavelength of 905 nm

Fig. 3. Flowchart of simulation

Fig. 4. Schematic diagram of experimental system

Fig. 5. Set up the experimental system

Fig. 6. Comparison diagrams of simulation and test

Fig. 7. Pulse laser echo intensity at different length of pipes

Fig. 8. Comparison diagrams of simulation and test