差分分时放大可拆卸式矿井瞬变电磁天线的研制

Development of Detachable Mine Transient Electromagnetic Antenna with Differential Time- sharing Amplification

由于瞬变电磁技术对水体反应灵敏,已被广泛应用于煤矿井下水害的探测。该技术要求天线携带方便,激发的二次场能量强,接收天线动态范围大,在探测过程中天线不发生形变。分析了二次场与发射天线的关系,通过实验获得发射天线最佳参数;采用差分分时放大滤波技术,扩大接收天线动态范围,压制外部噪声;采用可拆卸式硬质支架,防止天线在探测过程中产生形变。通过现场试验,验证了天线的准确性。

Transient electromagnetic technique has been widely used in coal mines for water disaster detection due to its good sensitivity to the water body. This technique required that the antenna should be easily carried, the energy of the excited second field should he strong, the receiving antenna should have a broad dynamic range and it should not he distorted in detection. In this paper, analysis was made on the relation between the second field and transmitting antenna, and the best parameters of the transmitting antenna were obtained by experiments; the differential time-sharing amplification and filtration technology were used to expand the dynamic range of the receiving antenna and suppress the external noise ; and the detachable hard bracket was used to prevent the antenna from distorting in detection. The accuracy of the antenna was verified by site tests.