动电效应测井探测器电子系统设计

摘要

Electronic system for electrokinetic logging sonde is presented.The main control unit,the sonic exciting unit,the electronic exciting unit,the signal processing and data acquisition unit are interconnected through a custom high-speed tool bus that form a distributed architecture.CPLD/FPGA are employed to perform tool bus protocol and subsystem control function.In the signal processing and data acquisition unit,the NIOS is used to realize the local data acquisition control and data process function.For achieving real-time system control,μC/OS-Ⅱ is run in the main control unit.The electronic system has passed high temperature test,simulated logging test in pool and field logging test.It is reliable and stable to get high signal-to-noise data.%介绍了动电效应测井探测器电子系统的设计.该电子系统由主控电路、声激励电路、电激励电路和电、声信号处理及采集电路组成,各功能电路通过自定义高速仪器控制总线互联,形成分布式架构.该电子系统广泛使用CPLD/FPGA实现总线协议和子系统控制功能,并在电、声信号处理及采集电路中运行NIOS系统,完成本地数据采集控制和数据处理的功能.主控电路运行μC/OS-Ⅱ嵌入式操作系统,实现系统实时控制.整个电子系统经过实验室高温测试和水池实验及现场测井实验,得到了良好的测试数据,系统运行稳定可靠.