桥梁无线传感系统设计与分析  

Design and analysis of wireless sensing system for bridge

作　　者：李嘉波 叶敏[1] 李四维 郭健[1] 

机构地区：[1]长安大学工程机械国家重点实验室,陕西西安710064

出　　处：《传感器与微系统》2017年第12期68-70,共3页Transducer and Microsystem Technologies

摘　　要：为满足桥梁监测的要求,对采集的数据实现无线传输,设计了数据无线采集传输系统。以STM微处理器和振弦式传感器为核心元件,对桥梁应变进行监测分析。分析了振弦式传感器的工作原理,对比分析了两种传统的激振原理,并结合两种激振方式的优缺点,提出了对低压扫频激振原理的改进方法,对激振电路进行了优化设计,同时设计了基于NRF905无线传感网络,完成了数据采集的无线发送和接收。实验结果表明:改进后的激振电路测量精度小于0.1%,系统工作稳定,无线传输功能满足桥梁监测要求。In order to meet the requirements of bridge monitoring,wireless transmission of the collected data is realized,and data wireless acquisition and transmission system is designed. The STM microprocessor and the vibrating wire sensor are used as the core components to monitor and analyze the bridge strain. Working principle of vibrating wire sensor is analyzed,and two kinds of traditional excitation principle are compared and analyzed.The advantages and disadvantages of two kinds of excitation modes are discussed,and improved method of low voltage frequency swept excitation principle is put forward,and excitation circuit is designed and optimized.Wireless sensor networks based on NRF905 are designed and wireless transmission and reception are achieved.The experimental results show that presion of measurement based on improved excitation principle is less than0. 1 %,the system is stable and the wireless transmission function meets requirements of bridge monitoring.

关 键 词：振弦式传感器 激振电路 无线传输 信号处理 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]