基于双通道数据合成的矿用本安型瞬变电磁仪研制

Development of Mine Intrinsically-Safe Transient Electromagnetic Instrument Based on Dual-channel Data Synthesis

由于瞬变电磁技术对水体反应灵敏,已被应用于煤矿井下水害探测。在远距离超前探测时,要求瞬变电磁仪具有抗干扰发射、大动态低噪声采集和防爆设计等特点。为此,研制了双极性发射系统,通过工频整数倍正负发射压制工频干扰;研制了双通道同步放大滤波、双模/数同步采集、双通道数据硬件合成电路,实现大动态范围压噪采集;为保证安全使用,对电源输出进行过流、短路和反接保护。最后通过对充水采空区的探测,验证了仪器的准确性。

The transient electromagnetic technique has been widely used for water disaster detection in coal mines due to its sensitivity to the water body. When the transient electromagnetic instrument is used for remote advance detection, it should have the characteristics of anti-interference transmission, the high dynamic and low-noise acquisition and explosion-proof design. For this purpose, a bipolar transmitter was developed, which used the bipolar transmission with integral multiple of power frequency to suppress the power noise; a circuit with dual-channel simultaneous amplification and filtering, bi-module simultaneous acquisition and dual-channel data synthesis was designed, and the noise-suppression acquisition in a large dynamic range was achieved;for the safe use of the the transient electromagnetic instrument, the over-current protection, short-circuit protection and reverse-connect protection were provided. Finally the accuracy of the transient electromagnetic instrument was verified by the detection of a water-filled zone.