A new technique of methane detection, with constant voltage and low temperature of sensor, is developed.
提出了一种定压低温式甲烷检测方法，并分析了其工作原理和特点。
A new coalmine methane detection method based on Beer-Lambert Law using absorption type optic fiber is investigated.
从理论上提出了一种基于比耳朗伯定律的新型煤矿安全系统瓦斯检测方法。
A catalytic sensor has been widely used for methane detection. Its nonlinear characteristic has lowed the accuracy of the methane detection.
热催化元件是广泛地用于瓦斯检测的一种传感器，其非线性特性影响了瓦斯检测的准确性。
Based on the near infrared spectral absorption of methane, a system using absorption type optic fiber for high sensitivity methane detection is demonstrated.
基于甲烷气体的近红外吸收光谱，研究了一种高灵敏度光谱吸收型光纤甲烷气体传感器。
Based on the infrared spectrum absorption characterization of methane gas, the long optical distance differential absorption method for methane detection is studied.
基于甲烷气体的红外光谱吸收特性，研究了长光程差分吸收式甲烷气体检测的方法。
Black-black sensing element is a carrier catalytic element for the detection of 0 ~ 4% methane in air.
黑黑元件是用来检测空气中0 ~ 4%甲烷气体的载体催化元件。
This paper analyses detection principle of mine methane by use of a variable current detector, a new variable current detector circuit is designed.
分析了矿井瓦斯变流检测原理，设计出一种新型的瓦斯变流检测电路。
IR technique is one of the most active areas that researches into the real-time detection of the concentration of Methane.
利用红外技术实现煤矿瓦斯浓度的实时检测是目前比较活跃的研究领域之一。
Methane explosion accidents occur frequently, and accurate and real-time detection and early warning of methane concentration are the effective means of preventing these accidents.
瓦斯爆炸事故频繁发生，对瓦斯浓度进行准确、实时检测和预警是治理瓦斯危害的有效手段。
Secondly, spectral modulation techniques are applied into concentration detection because methane has very weak absorption in near-infrared region.
其次，针对甲烷在近红外波段吸收弱的特点，把光谱调制技术用于浓度检测。
Based on the characteristic of spectrum absorption of acetylene, an optical fiber detection system for methane gas is presented, which has reference channel and is for on line and real time detection.
基于乙炔气体的光谱吸收特性，采用一种带有参考通道的光纤乙炔气体在线实时检测系统。
Based on the characteristic of spectrum absorption of acetylene, an optical fiber detection system for methane gas is presented, which has reference channel and is for on line and real time detection.
基于乙炔气体的光谱吸收特性，采用一种带有参考通道的光纤乙炔气体在线实时检测系统。
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