分布式电磁探测宽频数据采集系统设计与实现  

Design and implementation of broadband data acquisition system for distributed electromagnetic exploration

作　　者：张文秀[1,2] 林君[1,2] 刘立超[1,2] 胡瑞华[1,2] 

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]吉林大学仪器科学与电气工程学院,长春130026

出　　处：《吉林大学学报（工学版）》2012年第6期1426-1431,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(40727002);油页岩勘探开发利用产学研用合作创新研究项目(OSR-02-01)

摘　　要：将地球物理勘探中广泛应用于地震数据采集的分布式采集技术引入电磁探测仪器,针对被测电磁场信号宽频带、大动态范围、强噪声干扰的特点,通过设计低噪声的模拟信号调理电路,采用24位Δ-Σ结构模数转换器(Analog-to-digital,ADC)和现场可编程门阵列(Fieldprogrammable gate array,FPGA)构建了高性能的数据采集系统。利用微控制器及其外围功能模块实现了数据采集系统的工作流程控制、数据存储和传输。主要技术指标测试和水槽模型及野外勘探对比试验结果表明:该系统性能先进,测量准确,能够满足分布式电磁探测数据采集的需求。Distributed data acquisition technology,which is widely used in seismic exploration,was introduced in electromagnetic geophysical system.The measured electromagnetic signals possess the characteristics of broadband,large dynamic range and strong interference.Low-noise analog signal conditioning circuit was designed and a high-performance data acquisition system was constructed using 24-bit Δ-Σ Analog-to-Digital Converter（ADC） and Field Programmable Gate Array（FPGA）.In this data acquisition system,a microcontroller with peripheral modules was used to achieve workflow control,data storage and transmission.The test results of main technical specifications,and flume model and field experiments show that the system is feasible and accurate,which meets the needs of data acquisition of distributed electromagnetic exploration.

关 键 词：仪器仪表技术 分布式系统 电磁探测 宽频信号调理 数据采集 Δ-Σ模数转换器 

分 类 号：TH762[机械工程—仪器科学与技术] P631.3[机械工程—精密仪器及机械]