摘要
实际工程结构中的振动检测是十分重要的,也是十分复杂的,常用的结构振动检测传感器易受工程现场恶劣环境的影响,而光纤传感器具有小巧、抗电磁干扰、灵敏度高、适合长期监测等优点。本文建立了基于马赫—曾德(Mech-Zehnder)干涉原理的光纤传感振动检测系统,研制了运用先进的数字信号处理技术采集和处理数据的专用软件,并在典型结构件——钢制悬臂梁结构上进行了外加信号作用下的强迫振动检测和冲击载荷作用下的自由衰减振动检测,测量了该结构件的频率及振幅,其结果与同时进行的成熟的电测结果相近,说明光纤传感器用于结构件的振动测量是可靠的。本文为光纤传感器应用于实际工程的振动检测提供了新的技术装置,具有工程应用前景。
The vibration measurement of the practice engineering structure is very important and very complicated. The normal measuring sensor is easily affected by mal-condition of engineering field, whereas the fiber optic sensor has the advantages: more ingenious, high sensitivity, interference-free of electronic-magnetism, adapt to long-term monitoring, etc. The fiber optic sensor vibration measuring system based on the Mech-Zehnder interferometry is established, and the dedicated data acquisi?ion and processing software using advanced digital signal processing technology is developed in the papter. The system is introduced into the vibration study of typical structure, measuring the frequency and amplitude of the vibration subjected to force and free vibration with attenuation of the steel cantilever struc?ure. The results of fiber optic sensor measurement approximate to the results of electronic strain gauge, so it is reliable to use fiber optic sensor in the vibration measurement of structure. The paper provides new technical equipment for the vibration measurement of the practice project using fiber optic sensor with prospective engineering application.
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出处
《力学季刊》
CSCD
北大核心
2004年第1期46-50,共5页
Chinese Quarterly of Mechanics
基金
上海市教委重点课题资助项目
