智能化长周期MT仪器的结构设计方案

进行国家深部探测技术与实验研究专项子课题SinoProbe-01等的研究工作,需要借助于周期大地电磁测深仪;使用的进口仪器LEMI—417存在无GPS信号会出现记录紊乱、未提供远参考功能等缺陷,故需要设计适合课题需要的长周期大地电磁测深仪器。在研究了现代仪器的三种结构类型、国内外MT仪器的硬件组成、长周期MT仪器的设计原则后,提出了一种基于微机两级控制的精简结构体系,将其用于长周期大地电磁测深仪器的设计,并将设计的仪器与LEMI—417在野外多个测点进行了对比试验,结果表明本系统与LEMI—417采集的时间序列信号及大地电磁测深曲线比较一致,说明该仪器可进行大地电磁测深工作。

Structure of the Long Period Intelligent MT Instrument

Long period Magnetotelluric(MT) instrument is an indispensable instrument during the implementation of the program "Deep Exploration Technology and Experimentation (SinoProbe)" in China. However, China can not make long period MT instrument by itself now. LEMI-417, An MT instrument imported from Ukraine, used by our group team, does not provide far reference function to reduce the effects of noise, and does not work normally without GPS signal during acquisition, so it is necessary to develop a set of long period MT instrument which fit the project. After studying the structure of the three types of modern instruments, the hardware composition of general MT instrument, and the design principles of the long-period MT, we proposed an architecture system simplified, which was based on two-stage microcomputer control, and put it to use the design of a long-period MT instrument. This instrument and LEMI-417 were used to collect MT data in several measuring sites in the same time. The experimental results show that both their time series curves and the MT sounding curves are consistent. Therefore, this instrument can be used to probe crust and upper mantle structure.