公开(公告)号：US06687011B1

公开(公告)日：2004-02-03

申请号：US09469756

申请日：1999-12-22

申请人： Jung Ju Lee ,  San Hoon Kim ,  Dong Chun Lee ,  Il Bum Kwon

发明人： Jung Ju Lee ,  San Hoon Kim ,  Dong Chun Lee ,  Il Bum Kwon

IPC分类号： G01B902

CPC分类号： G01B11/161 ,  G01B2290/25 ,  G01D5/266 ,  G01D5/268 ,  G01K5/486 ,  G01K11/32 ,  G01K11/3206

摘要： A transmission-type extrinsic Fabry-Perot interferometric optical fiber sensor and a method used for integrity monitoring of structures and measuring strain and temperature are provided. The transmission-type extrinsic Fabry-Perot interferometric optical fiber sensor includes first single-mode optical fiber and second single-mode optical fiber, laser device, and optical detector. The first single-mode optical fiber is inserted into an end of a capillary quartz-glass tube and the second single-mode optical fiber is inserted into the other end of the capillary quartz-glass tube. Air gap is formed between the first single-mode optical fiber and the second single-mode optical fiber in the capillary quartz-glass tube. Gap length of the air gap changes in response to magnitude and direction of transformation of the capillary quartz-glass tube. The laser device launches light into an end of the first single-mode optical fiber. The end of the first single-mode optical fiber is not inserted into the capillary quartz-glass tube. The optical detector detects interferometric fringe of light. The light is launched from the laser device and passed through the first single-mode optical fiber, the air gap, and the second single-mode optical fiber. The number of occurrence of the interferometric fringe and trend of signal level are determined by change of the gap length.

摘要翻译： 提供了透射型外部法布里 - 珀罗干涉光纤传感器和用于结构的完整性监测和测量应变和温度的方法。 透射型外部法布里 - 珀罗干涉光纤传感器包括第一单模光纤和第二单模光纤，激光器件和光检测器。 将第一单模光纤插入毛细管石英玻璃管的一端，将第二单模光纤插入毛细管石英玻璃管的另一端。 在毛细管石英玻璃管中的第一单模光纤与第二单模光纤之间形成气隙。 气隙的间隙长度随着毛细管石英玻璃管的转变的大小和方向而变化。 激光装置将光线发射到第一单模光纤的一端。 第一单模光纤的末端未插入毛细管石英玻璃管中。 光学检测器检测干涉光线条纹。 光从激光装置发射并通过第一单模光纤，气隙和第二单模光纤。 干涉条纹的发生次数和信号电平的趋势由间隙长度的变化决定。