可控源音频大地电磁法密频比组合波观测系统

Controlled Source Audio-frequency Magnetotellurics Dense Frequency Ratio Combination Wave Observation System

讨论了可控源音频大地电磁法CSAMT（Controlled Source Audio-frequency Magnetotellurics）密频比组合波观测系统及其硬件结构。该系统一次能同时至少观测三个频率,既保证了观测精度,又极大地提高了观测效率,且能根据实际情况,进行任意组合方式下的CSAMT作。在接收机的实现上,使用了模拟傅氏变换技术,使低速A/D转换器能满足测量要求,降低了成本。引入微机控制,提高了仪器的可靠性,并能实时处理现场观测数据。

Controlled source audio-frequency magnetotellurics (CSAMT) dense frequency ratio combination wave observation system and its hardware are discussed in this paper. This system can observe three frequencies at the same time at least,which does not only ensure the observing accuracy but also greatly improve the measuring efficiency. It can work in diverse assorted way of triplex frequency CSAMT. Analog fourier transform technology (AFT) is used in the receiver, which makes low A/D transformer to meet the demand for measurement and reduces the cost. The microcomputer is used also,so the reliability of the instrument is improved and the instrument can handle field data in real time.