Theoretical analysis and experiment of micromechanics and mechanics-optics coupling of distributed optic-fiber crack sensing  

作　　者：LIU HaoWu 1,2,CHEN Jiang 2,SUN Man 3 & DING Rui 2 1 State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China 2 School of Water Resource Hydropower,Sichuan University,Chengdu 610065,China 3 School Electrical Engineering and Information,Sichuan University,Chengdu 610065,China 

出　　处：《Science China(Technological Sciences)》2011年第S1期185-191,共7页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China and the Joint Foundation of Yalong River Hydropower Development (Grant No.50579094)

摘　　要：The micromechanical behaviors and mechanics-optics coupling effects of optic-fiber-concrete complex in the distributed optic-fiber sensing concrete-crack technology,which was used in health monitoring of Wu Gorge Bridge on Yangtze River and a large dam successfully,have been investigated.A micromechanical theoretical analysis method and micromechanical frictional contact bi-interface model,as well as a modified optical theoretical analysis method of the mechanics-optics coupling effects are presented.A series of verification experiments,including mechanical experiments and mechanics-optics coupling experiments,have been preformed.The results of micromechanical theoretical analysis and the analysis of the modified theory of mechanics-optics coupling along with mechanical and optical experimental data are shown to be in close agreement.Both the micromechanical theory and the modified theory of mechanics-optics coupling with their analysis methods can not only enhance credibility of this novel distributed sensing technology but also provide a way to understand its sensing mechanism and optimize its technical details and system.The micromechanical behaviors and mechanics-optics coupling effects of optic-fiber-concrete complex in the distributed optic-fiber sensing concrete-crack technology,which was used in health monitoring of Wu Gorge Bridge on Yangtze River and a large dam successfully,have been investigated.A micromechanical theoretical analysis method and micromechanical frictional contact bi-interface model,as well as a modified optical theoretical analysis method of the mechanics-optics coupling effects are presented.A series of verification experiments,including mechanical experiments and mechanics-optics coupling experiments,have been preformed.The results of micromechanical theoretical analysis and the analysis of the modified theory of mechanics-optics coupling along with mechanical and optical experimental data are shown to be in close agreement.Both the micromechanical theory and the modified theory of mechanics-optics coupling with their analysis methods can not only enhance credibility of this novel distributed sensing technology but also provide a way to understand its sensing mechanism and optimize its technical details and system.

关 键 词：optic-fiber sensing mechanics-optics coupling MICROMECHANICS health monitoring concrete structure CRACK detection 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]