核电站主蒸汽系统冗余压力传感器异常检测

为保障核电站运行安全,电站设置冗余传感器对重要系统的关键参数进行测量,传感器的健康状况将直接影响测量结果.在被测冗余传感器个数较少,为3个左右时,目前核电站常用的传感器校准方法很难区分故障传感器.将独立成分分析和序贯概率比检验(independent component analysis-sequential probability ratio test,ICA-SPRT)相结合的方法用于冗余传感器故障检测,使用核电站主蒸汽系统冗余压力传感器数据进行验证.与简单平均法的结果进行对比可知,该方法在冗余度不高的情况下明显优于简单平均法,能及时准确地检测到传感器信号的漂移.     

Distributed Signal Condition System for EAST Tokamak

In order to achieve both the signal condition remote control and the work statute self-check through Ethernet,a distributed signal condition (DSC) system has been developed for control and data acquisition (CODAC) in the EAST tokamak nuclear fusion experiment.Based on differential amplifiers,analog multiplexers and the embedded Ethernet communication technology,a DSC system is designed and produced.This paper summarizes the DSC system design,and presents a kind of calibration method for it.This DSC system has been integrated into the EAST CODAC system,and used successfully in the 2008 EAST experiments.The user-friendly,high performance,and cost-effective DSC system greatly improves the work efficiency and reduces the fault rates of the CODAC system.     

嵌入式网络技术在门禁系统中的应用

本工作基于AVR单片机ATmega128和嵌入式实时操作系统Nut/OS完成了一种低成本、高效率的网络设备.该设备在实时记录某一场所内准确人数的同时,能通过以太网告知门禁系统现场的人数.满足了某些需要远程实时获取某一场所准确人数的工业和科研场合的需求.