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

Table 3

Spectral AOD versus direction of ventilation.

m	AOD	AOD	/m	AOD	AOD	λ/μm	AOD	AOD
	Positive direction	Negative direction		Positive direction	Negative direction		Positive direction	Negative direction
3	0.52062	0.60375	11	0.28086	0.31968	19	0.20359	0.23151
4	0.43089	0.49614	12	0.23811	0.27075	20	0.21137	0.2406
5	0.33751	0.38509	13	0.24519	0.2788	21	0.23871	0.27215
6	0.27493	0.31253	14	0.21768	0.2472	22	0.27067	0.30879
7	0.21937	0.24891	15	0.2002	0.22729	23	0.26736	0.30463
8	0.09544	0.10727	16	0.20257	0.23017	24	0.25376	0.28889
9	0.40835	0.47070	17	0.21023	0.23911	25	0.23153	0.26354
10	0.37973	0.43616	18	0.20673	0.23511