用于煤与瓦斯突出的3D电磁辐射探测系统

针对煤与瓦斯突出时产生的电磁辐射信号微弱的情况,给出一种3D电磁辐射探测系统。该系统采用3个空间相互垂直的偶极天线感应探测电磁辐射信号,利用超外差接收原理,通过混频、放大、滤波、模数转换等处理,完成感应电磁辐射信号的处理。采用这种装置,既可分别独立探测空间3个相互垂直的电磁辐射信号,也可进行3维电磁辐射信号的综合探测。实测表明,系统具有很好的性能,其工作频率范围为100kHz~3GHz,电场感应灵敏度为0.1V/m。接口可以输出中心频率为36MHz,带宽为6MHz的电磁辐射信号,也可实时进行FFT等信号处理。

The 3D electromagnetic radiation detection system for coal and gas bursting

The paper aims to introduce a 3D electromagnetic radiation detection system in light of the phenomenon that the electromagnetic radiation signal is getting weak while coal and gas are bursting. The system makes use of three dipole antennas which are spatially perpendicular to induce and detect electromagnetic radiation signals. It adopted the super- heterodyne receiver principle, and completed the sensation of the electromagnetic radiation signals processing by mixing, amplification, filtering, modulus conversion and so on. With the application of this device, it is not only able to detect the three spatially perpendicular electromagnetic radiation signals independently, but also to probe the 3 D electromagnetic radiation signals integrate. Tests showed that the system functioned well： the range of the operating frequency was 100 kHz ~ 3GHz, and the sensitivity of electric field was 0.1V/m. Its out- put center frequency of the connector could achieve 36MHz; even a 6MHz bandwidth electromagnetic radiation signal could simultaneously conduct signal processing like FFT.