A dynamic strain measurement system using fiber grating sensors and its application in structural health monitoring
Fiber Bragg grating(FBG)sensors have found increasing uses in structural applications.Conventional interrogation systems for these sensors are often slow in speed and can only cope with quasi-static signals.A simple,low cost and fast responding interrogation system that makes use of a hybrid fiber Bragg grating-long period fiber grating arrangement to achieve intensity modulation has been developed.The system is capable of measuring dynamic strain variation up to 150 kHz.By means of this dynamic response capability,the system has been successfully applied to detect the occurrence of small missile impact on a metallic plate and a polymeric composite laminate.Comparison of the waveforms recorded from the impact attack on different points of the metal plate suggested that it is possible to locate the position of the impact.On the other hand,by periodic monitoring and comparing the responses of the embedded FBG,it is possible to reveal the occurrence of subsequent internal damage incurred in the composite laminate.These applications have good potential to be developed into full-scale structural health monitoring and diagnosis system.
fiber grating sensors intensity modulation dynamic strain interrogation impact monitoring structural integrity monitoring
C.S. Shin B. L. Chen C.C. Chiang
Department of Mechanical Engineering,National Taiwan University,No.1,Sec.4,Roosevelt Road,Taipei 10617,China
国际会议
The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)
重庆·南京
英文
2007-05-01（万方平台首次上网日期，不代表论文的发表时间）