| 摘要 |
The present invention is a method and apparatus for remotely detecting methane gas in mines by laser remote sensing technologies. The apparatus has at least one light source emitting photons towards mine walls and at least one light detection device accepting photons reflected from mine walls. When methane gas presents at the optical path, these photons experience strong optical attenuation and indicate methane existence. The invention employs tunable laser spectroscopy technology to measure the concentration path length vectors. The invention further uses tomography algorithms to determine existence, concentration and distribution of methane gas from the measured concentration path length vectors. Explosions due to mix of methane mine gas with air can be prevented by sensing methane existence and minimizing its concentrations through methane drainage and ventilation.
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