多频组合波电法的信号相干检测同步方案

针对电法勘探中同步的重要性和现有同步方法存在的问题、不完全同步的实质、同步信号与待测信号不完全同步相干检测对多频组合波电法相干检测的傅里叶变换结果的影响 ,研究了共时钟完全同步相干检测方案及其原理、具体实现过程 .实验结果表明 :利用共时钟完全同步方案可以使待测信号与采样控制信号完全同步 ,达到准确采集数据的目的 ,得到待测信号的精确傅里叶变换结果 ;本同步方案不仅可在多频组合波电法仪器中获得成功应用 ,还可以推广到单频电法仪器中 ,得到更好的应用效果

On synchronous detection of the multiple-frequency electric method

This paper first analyzes the importance of synchronism, problems of the applied synchronous method and the reality of non synchronizing, and then expounds the Fourier transform error for the data acquisition of the instruments applied in the multiple frequency electric prospecting due to non synchronizing pulse from the multiple transmitter and the multiple frequency receiver. A new system which is employed for both the transmitter and receiver is designed for the multiple frequency electric prospecting, and applied successfully in the triple frequency induced polarization method and triple frequency electromagnetic frequency which is a kind of controlled audio frequency magnetotellurics.