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煤矿井下甲烷是公认的主要安全隐患,井下爆炸大都是由甲烷引起的。安全规程中规定了矿井风流中允许的甲烷浓度。对甲烷浓度进行准确测定一直认为是很必要的。在过去30年中,研究人员已研制出了各式各样的矿用便携式甲烷检测仪。而目前井下使用的所有甲烷检测仪都需要使气体通过检测元件。这些检测仪器配以可伸缩探头、取样泵、吸气球、管束等,可用于远距离检测,这些附加设备的作用是把气样从取样点传送到检测仪。在现代环境遥控系统中,传感器设置在被检测区域内,所产生的信号借助于遥测装置传输给控制台的计算机。在所有这些检测系统中,必须有气样通过传感器。
Methane in coal mines is a recognized major safety hazard. Most of the underground explosions are caused by methane. The safety regulations stipulate the methane concentration allowed in the wind flow in the mine. Accurate determination of methane concentration has always been considered necessary. In the past 30 years, researchers have developed a wide range of mining portable methane detector. At the moment all methane detectors used downhole need to pass gas through the test cell. These detectors are equipped with retractable probes, sampling pumps, aspirating balloons, tube bundles, etc. for long-range detection. These additional devices serve to transfer gas samples from the sampling point to the detector. In the modern environment remote control system, the sensor is arranged in the area to be detected and the generated signal is transmitted to the control computer by means of telemetry. In all of these test systems, a gas sample must pass through the sensor.