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为了适应地质探测的要求,结合便携式探测系统的设计思想,根据瞬变电磁信号的特点,设计了基于ARM的高采样率和高准确度的瞬变电磁数据采集系统。通过实验测量,系统采样速率达2μs,误差为10 mV,可以满足实际使用要求。该系统的特点是:使用精密放大器组成的电阻网络对二次场信号实现了分段放大,避免了前期信号出现饱和,同时后期微弱信号可以得到准确采集;使用先进先出(FIFO)存储器节约CPU时间,保证AD7677对瞬变电磁前期信号的采集速率。
In order to meet the requirements of geological exploration, combined with the design idea of portable detection system, according to the characteristics of transient electromagnetic signals, a high-sampling rate and high-accuracy transient electromagnetic data acquisition system based on ARM was designed. Through experimental measurements, the system sampling rate of 2μs, the error of 10 mV, to meet the actual use requirements. The system is characterized by: the use of precision amplifier consisting of resistor network of the secondary field signal to achieve a phased amplification, to avoid the pre-saturation signal, while late weak signal can be accurately collected; the use of first-in-first-out (FIFO) memory saving CPU Time, to ensure that the AD7677 electromagnetic transient signal acquisition rate.