混场源电磁接收与标定系统的设计  

Design of hybrid-source magneto telluric reception and calibration system

作　　者：王言章[1] 程德福[1] 万云霞[2] 林君[1] 

机构地区：[1]吉林大学地球信息探测仪器教育部重点实验室,长春130026 [2]吉林大学-美国德州仪器DSP联合实验室,长春130026

出　　处：《仪器仪表学报》2008年第2期304-308,共5页Chinese Journal of Scientific Instrument

基　　金：国土资源部“十五”(2000307)资助项目

摘　　要：混场源电磁法(HSMT)综合了大地电磁法(MT)和可控源音频大地电磁法(CSAMT)的特点,以天然场和人工场相结合为场源,探测介质的电阻率。本文为实现电磁信号的有效接收,开发了一种同时进行四分量测量的24位并行HSMT接收系统。采用低功耗DSP芯片控制,工作方便、快捷、灵活并能够保证足够的精度。应用以方波作为标定信号的标定方法,该系统可实现对接收通道和接收磁传感器的动态响应标定,提高了标定效率。通过改变采样频率,系统可在0.1Hz～90kHz的宽频率范围内有效工作。Integrating the characteristics of MT and CSAMT with combination source of nature and artificial electromagnetic field, Hybrid-source magneto tellurics （HSMT） detects the resistivity of the medium. To accomplish the reception of the electromagnetic field intensity signal effectively, a kind of 24-bit parallel HSMT receiving system that can measure four vectors simultaneously is developed and the system is controlled by low power consumption DSP chip. This system is not only convenient, fast and flexible, but also can provide enough measurement accuracy. A square wave is used as the calibration signal for the dynamic frequency response calibration of the receiving channels and magnetic sensors, and the calibration efficiency is improved. Through switching sampling rate, the system can effectively work in a wide frequency range of 0.1 Hz -90 kHz.

关 键 词：混场源电磁法 接收系统 DSP 传感器标定 

分 类 号：TH762.3[机械工程—仪器科学与技术]