瓦斯流动对电磁辐射频谱的影响

Effect of Gas Flow on the Spectrum of Electromagnetic Radiation

制造了大直径密封缸体,建立了瓦斯气体流动及电磁辐射测试的实验系统,用傅里叶变换对不同压力梯度和不同种类瓦斯气体在煤体中流动时电磁辐射的频谱进行了分析。结果表明,瓦斯气体流动产生的电磁辐射频带一般在较低频带,瓦斯流动时电磁辐射的主频带基本随压力梯度的升高而增大。压力梯度越大,瓦斯流动速度越高,对煤体的破坏作用越强,动电效应也越明显,裂隙振荡的频率也越高,从而产生的电磁辐射也越强,频率也越高。

A airtight large-diameter urn was made in which electromagnetic radiation (EMR) antennae can be placed and the experimental system was set up that can detect EMR signals during gas flowing in coal. EMR spectrum analysis was done by Fourier transform when different kinds of gas under different pressure gradients flow in coal. The results show that frequency band of EMR produced by gas flowing is usually in low frequency and its main frequency band increases with the increase of pressure gradient. The higher the pressure gradient and the rate of gas flow, the more intensive the destruction of coal and the motion-electricity effect, and the higher the frequency of crack oscillation.