基于光载无线的大型构件形变监测技术  

Deformation Monitoring Technique for Huge Structures Based on Radio over Fiber

作　　者：曹海林[1] 尹朋[1] 管伟[1] 应伟兵[1] 杨力生[1] 

机构地区：[1]重庆大学通信与测控中心,重庆400044

出　　处：《世界科技研究与发展》2013年第3期370-373,共4页World Sci-Tech R&D

基　　金：重庆市科委自然科学基金计划(CSTC2010BB2243);中央高校基本科研业务费(CDJZR11160007)资助

摘　　要：提出了一种利用光载无线技术针对大型构件的形变进行监测的新方法,对系统的工作原理进行了阐述及分析。与传统的反射测距及转发测距方案不同,新方法将远程天线单元作为信标安装在被测大型构件上,通过光纤将射频信号送到远程天线单元,实现收发共本振,消除频率漂移带来的相位误差。根据相位测距原理,通过监测收发中频信号相位差的变化信息获得大型构件的形变量。对系统的误差进行仿真分析并对鉴相器进行测试。结果表明:系统能精确的对信标所在位置发生的形变进行监测。通过合理设计,其精度可达毫米级。A micro-deformation monitoring technique based on Radio over Fiber for huge structures is proposed. Different from traditional ran- ging by reflection or using transponder, a remote antenna unit was mounted as a beacon on the huge structure. A fiber transmitting the RF sig- nals to the beacon, there is a same frequency in transmitter and receiver. Then, the phase error caused by frequency offset was removed. The deformation information is calculated according to the change of phase offset of IF signals. The simulation of system error and the test of phase detector show that this system can estimate the deformation of the huge structure accurately.

关 键 词：大型构件 形变 光载无线 远程天线单元 本地天线单元 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]