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为解决聚焦双频激电法超前探测仪器应用于煤矿井下进行探测的问题,设计了矿用本安型聚焦双频激电法激电信号接收系统.该系统可产生双频PWM驱动控制信号,控制激励信号发送系统产生5路双频调制激励方波电流信号;通过井下测量电极及矿用传输电缆采集微弱激电电压信号,由锁相放大器进行信号处理后获得高低频电压幅值及相位等激电信息;矿用本安型人机界面实现探测数据及图像显示以及对整个系统的控制.研究结果表明:该接收系统产生驱动控制信号的频率为8 Hz及8/13 Hz、4 Hz及4/13 Hz、2 Hz及2/13 Hz、1 Hz及1/13 Hz四组中的任意一组,频率误差绝对值小于0.14%,激电电压幅值测量范围为±5 V,相对测量误差绝对值小于1.4%,满足实际超前探测要求.
In order to solve the problem of focused dual-band preamplifier advanced detection instrument used in coal mine exploration, this paper designed an intrinsically safe focused dual-frequency excitatory laser signal receiving system which can generate dual-frequency PWM drive control signal, Control the excitation signal transmission system to generate 5-way dual-frequency modulation exciting square wave current signal; through the underground measuring electrode and mine transmission cable to collect weak voltage signal, the signal processing by the lock-in amplifier to obtain high and low frequency voltage amplitude and phase The results show that the frequency of driving control signal generated by the receiving system is 8 Hz and 8/13 Hz, 4 Hz and 4/13 Hz, 2 Hz, and 2/13 Hz, 1 Hz, and 1/13 Hz, the absolute value of the frequency error is less than 0.14%, and the range of measurement of the amplitude of the voltage of the electromagnetism is ± 5 V. The relative measurement The absolute value of error is less than 1.4%, to meet the actual advance detection requirements.