地灾预警系统中的多通道振弦读数仪的设计  

Design of Multi-channel Vibrating Wire Readout Used in the Natural Disaster Early Warning System

作　　者：罗群[1] 曾国强[1] 黄锐[1] 谭承君[1] 刘玺尧[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059

出　　处：《自动化与仪表》2014年第2期8-11,19,共5页Automation & Instrumentation

基　　金：高技术发展计划(863)项目(2012AA061803);四川省科技厅科技支撑计划项目(2011FZ0064);四川省大学生创新创业训练计划项目(201310616034)

摘　　要：文中设计了一种应用于野外地质灾害监测系统中的多通道振弦读数仪。为符合野外监测设备的要求,采用了多通道前置信号处理电路,提取出振弦传感器内部钢弦共振所感应的衰减正弦波,经有源滤波、放大、比较后整形成同频方波,再利用高速ARM处理器脉冲边沿捕获单元实现共振频率的高精度采集测量。电路中设置了多路耐高压激振切换开关和多通道模拟开关切换电路,通过对多路振弦传感器分时激励实现自动切换测量,并对所测结果进行温度补偿来降低传感器所处环境温度对频率测量的影响,提高系统的整体测量精度。The vibration-wire reader was designed used in the field geological disaster monitoring system in the paper,and in accordance with the requirements of field monitoring equipment,the reader made use of multi-channel pre-signal processing circuit to extract the sensor resonance induction damped sine wave,using active filter,amplification,compare and organized into the same frequency square wave pulse edge,then use the pulse edge capture unit ARM to achieve the resonance frequency of the high-precision acquisition.With multi-channel high voltage excitation switch and multi-channel analog switch circuit,vibrating wire sensors can be measured automatically through the method of time-sharing incentive;and applying the temperature compensation to the measured result,it can reduce the ambient temperature of the frequency measurement and improve the overall measurement accuracy.

关 键 词：振弦传感器 钢弦共振 分时激励 频率采集 

分 类 号：TM932[电气工程—电力电子与电力传动]