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双频道幅频观测既同时供双频电流,又同时测双频电位差,井自动计算幅频率。双频电流的谐波成分与变频法所用矩形波电流的谐波成分是有差别的。但理论分析、模拟实验及野外观测均证明,双频道幅频观测的异常与变频法异常形态相同,且数值也十分接近。双频道幅频观测的发现异常能力与时间域激电法及变频法相当,而前者更轻便、快速、精度高。
Dual channel amplitude frequency observation both for dual-frequency current, but also measure the potential difference between dual-frequency, well automatically calculate the amplitude frequency. The harmonic components of the dual-frequency current and the rectangular wave current used in the inverter method are different. However, theoretical analysis, simulation experiments and field observations have proved that the anomalies of the dual-frequency amplitude-frequency observation are the same as those of the frequency-conversion method, and the values are also very close. The abnormal abilities of dual-frequency amplitude-frequency observation are comparable to those of the time domain method and frequency-conversion method, while the former is more portable, faster and more accurate.