负压下甲烷浓度非线性压力补偿模型

Nonlinear Pressure Compensation Model for Methane Concentration Measurement under Negative Pressure

煤矿井下瓦斯抽采管道内的气体压力一般为负压,红外甲烷浓度传感器的测量原理决定了其在负压环境工作时,测值与真值的误差较大。为提高测量精度,在实验室开展了40~90 k Pa(绝对压力)不同负压环境下的甲烷浓度测量试验,并根据试验数据建立了适用于负压环境的非线性分段压力补偿模型。

The gas pressure was under one bar pressure in the pipe for gas extraction at coal mine. According to the working principle of infrared methane sensor, the errors between measured-value and truth-value were relatively obvious under negative pressure. The methane concentration measurement experiments under 40 to 90 kPa pressure （absolute pressure） had been done for improvement of accuracy. A nonlinear-segmentation pressure compensation model for negative pressure was worked out according to experiment data.