【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。更多还原

【Abstract】 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.更多还原