太赫兹波穿透煤层的衰减特性

Attenuation characteristics of Terahertz wave penetrating coals

研究了煤层对太赫兹前端频率附近的电磁波(75~750 GHz)的衰减特性,经过测量太赫兹前端频率附近的电磁波垂直入射煤层前后的能量,并通过理论公式计算得到同一煤层对75~750 GHz频率范围的电磁波衰减值以及不同湿度、不同地区煤层对W频段(75~110 GHz)电磁波的衰减值。研究结果表明,同一煤层对不同频率的电磁波的衰减为5.02~43.49 d B/cm;不同湿度情况下煤层对110 GHz电磁波(W频段内)的衰减为5.88~47.65 d B/cm。频率越高或者是煤含水量越大,煤层对电磁波的衰减值就越大;同时也得知了不同地区煤层的衰减也存在着差异。

Using the vector network analyzer,signal generator,spread spectrum module,antenna and other experimental instrument,the attenuation characteristics of THz( terahertz) wave near the front( 75- 750 GHz) penetrating coals were studied,the previous and posterior energy of electromagnetic wave were measured when electromagnetic wave penetrates coal. The attenuation of electromagnetic wave penetrating coal at different frequency was obtained by theoretical formula; and the attenuation of electromagnetic wave penetrating coal with different water content and come from different mines was surveyed. The attenuation of electromagnetic wave at different frequency is 5. 02- 43. 49 d B / cm and the attenuation that coals with different water content is 5. 88- 47. 65 d B / cm; the attenuation of electromagnetic wave varies with different areas.