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《Journal of Beijing Institute of Technology》 2003-04
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Relationship Between the Crack Width and the Loss in Optical Fiber in Fiber Optical Crack Sensors

JIANG Yi1,Leung K.Y. Christopher2 (1Department of Optical Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing100081, China; 2Department of Civil Engineering, Hongkong University of Science and Technology, Hongkong, China)  
To obtain the characteristics of fiber optical crack sensors and to simplify their design, the bend loss of multiple mode optical fiber is analyzed using the ray theory. Several important parameters are calculated: relationship between the crack width and the optical loss, influence of the angle between the fiber and crack, the influence of numerical aperture to sensors. The theoretical analysis accords well with the experiment results.
【Fund】: 香港教育研究资助局资助项目(HKUST6132/98E)
【CateGory Index】: TP212.14
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