光纤传感器在相似材料模型测试中的相容性研究  

Study on Compatibility of Fiber Optical Sensor in Simulation Experiment with Analogy Material

作　　者：柴敬[1] 常心坦[1] 

机构地区：[1]西安科技大学能源科学与工程学院,西安710054

出　　处：《实验力学》2004年第4期453-458,共6页Journal of Experimental Mechanics

基　　金：国家自然科学基金 (5 0 3740 5 5 );陕西省重点实验室科研项目 (0 2JS43)资助

摘　　要：为了找出光纤传感器弯曲损耗与岩层变形破坏过程中变形的关系 ,在相似材料模型铺设过程中将光纤传感器埋入在层合材料之间。研究了相似材料模拟实验中 ,光纤与模型岩层的相互作用机理 ,光纤与模型岩层的相容性 ,以及提高二者相容性的方法 ;并设计了一种基于光时域反射技术的新型微弯光纤传感器 ,用于相似材料模型的应变、位移检测中。实验研究表明 ,这种传感器结构不仅能实现对岩体变形的监测 ,而且在该情况下传感器不会失效 ,具有较好的相容性。To find the relationship between the bending loss of fiber optical sensor and the changeable characteristic and premonitory information during the course of the beginning and developing of rock damage, the optical fiber sensor was embedded in the rock layer of the model for simulation experiment with the analogy material for mining. The interaction mechanism of the fiber with the material and the compatibility between the fiber optical sensor and construction of simulation experiment with analogy material were studied. A series of methods for improving the compatibility was brought forward. A new type of microbending sensor, based on the Optical Time Domain Reflectomter technology was developed for measuring strain and displacement in simulation experiment. The experiment results indicate that the novel construction of the fiber optical sensor not only is suitable for detecting rock deformation, but also is not failure at large rock deformation, has high compatibility with the construction of simulation experiment, and increase the localized loss along the sensing fiber embedded in the rock. This study provides theory foundation for practically detecting the rock damage of optical fiber sensing technology.

关 键 词：光纤传感器 微弯 位移检测 测试 相似材料模型 弯曲损耗 破坏过程 铺设 岩体 岩层 

分 类 号：O437.3[机械工程—光学工程] TP212[理学—光学]