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

Table 5

The transmittance of coal dust under the optical channel of 1260–1280 cm⁻¹.

Height/m	Transmittance
	1260 cm^−1	1270 cm^−1	1280 cm^−1	Equivalent
0.5	0.79357634	0.78322529	0.76093461	0.779245413
1.5	0.77153042	0.76953047	0.74345684	0.761505907
2.5	0.83354416	0.84187375	0.83086851	0.835428809