Performance assessment of a fiber optic methane sensor exposed to coal smoke

Abstract

ABSTRACT Underground mines have the risk of accumulating gases if not ventilated properly or during and after emergency situations when ventilation controls become damaged or stop working. Common gases that are monitored in the underground coal mine are carbon monoxide (CO), oxygen (O2), and methane (CH4). Methane is a gas found in coal and released through mining; its explosive range is between 5% and 15%. Methane is commonly monitored on all mining equipment and with handheld gas sensors carried by most underground coal miners. This article describes how the RSL fiber optic sensor is used for testing using smoke and its contaminants for applicability in emergency situations. The testing investigates individual contaminants such as CO2, temperature, and smoke. Each test was performed separately, and CH4 concentration, laser power, and response time data were collected.