Optical Estimation on Pollution Level of Respirable Dust Based on Infrared Transmitting Behavior in Coalmine Fully Mechanized Working Face

Figure 9

Influence of diameter on transmittance under different cases (uniform dust diameter, dust release intensity, position of coal cutting, wind speed, whether there is wetting of coal seam or not, and direction of ventilation): 5 μm, 0.005 kg/s, 5 m, 2.5 m/s, no, positive; 5 μm, 0.005 kg/s, 5 m, 4 m/s, no, positive; 5 μm, 0.01 kg/s, 5 m, 2.5 m/s, no, positive; 5 μm, 0.005 kg/s, 5 m, 2.5 m/s, yes, positive; 5 μm, 0.005 kg/s, 30 m, 2.5 m/s, no, positive; 5 μm, 0.005 kg/s, 5 m, 2.5 m/s, no, negative; 50 μm, 0.005 kg/s, 5 m, 2.5 m/s, no, positive; 50 μm, 0.005 kg/s, 5 m, 4 m/s, no, positive; 50 μm, 0.01 kg/s, 5 m, 2.5 m/s, no, positive; 50 μm, 0.005 kg/s, 5 m, 2.5 m/s, yes, positive; 50 μm, 0.005 kg/s, 30 m, 2.5 m/s, no, positive; 50 μm, 0.005 kg/s, 5 m, 2.5 m/s, no, negative.