谐波信号在人工源电磁法WEM中的应用

摘要

Wireless Electro-Magnetic Method(WEM)is a new artificial source electromagnetic sounding technique developed in the 1990s.In this paper,the origin of the harmonic of the transmitting electromagnetic signals in WEMwas analyzed,and the apparent re-sistivity and phase were calculated by using transmitting signals and its harmonic with the data of experimentation.Based on a compari-son of the two results,the authors considered that this technique is an effective method by using harmonic in the artificial source elec-tromagnetic methods.It can improve work efficiency by decreasing transmitting frequency numbers or improve accuracy of interpretation by increasing frequency numbers of the electromagnetic response curves.This technique can be used in other artificial source electro-magnetic methods because the harmonic always coexists with the transmitting electromagnetic signals in the source electromagnetic method.%无线电磁法（WEM）是20世纪90年代发展起来的一种新的人工源电磁探测技术。对WEM法中发射电磁信号的谐波产生进行了分析，并根据实测资料，利用发射信号谐波计算得到的测点视电阻率和相位值与基波信号计算结果进行对比，认为在WEM法中可以有效利用谐波，减少发射频率点，提高工作效率，或加密频率点，提高资料的解释精度。由于在人工源电磁法中，发射的电磁信号中普遍存在谐波信号，因此，此技术也可以应用于其他人工电磁法中。