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三频组合波频率测深法是一种频率测深新方法，发送机同时发射３种频率的电磁波，接收机每一通道同时接收３种频率的电磁场分量，同时得到３种频率的波阻抗和２个相对相位差，且发射机和接收机之间不需相位参考系统，因而具有高效、高精度和接收设备轻便等特点．三频组合波的原理适合频域中的其它电法勘探，发射机具有多功能特性，接收机能设计成地球物理数据综合采集系统，故用途广泛。
Tri-band combined wave frequency sounding method is a new method of frequency sounding. The transmitter transmits three kinds of electromagnetic waves at the same time. The receiver receives three kinds of electromagnetic field components at the same time for each channel. At the same time, three types of wave impedance are obtained 2 relative phase difference, and no phase reference system between the transmitter and receiver, which has high efficiency, high precision and light receiving equipment and so on. The principle of the tri-band combined wave is suitable for other electrical surveys in the frequency domain. The transmitter has multi-functional characteristics and the receiver can be designed as a comprehensive collection system of geophysical data. Therefore, the utility model is widely used.