四芯光纤弯曲传感器  

Four-Core Fiber Based Bending Sensor

作　　者：赵士刚[1] 王雪[2] 苑立波[2] 

机构地区：[1]哈尔滨工程大学国家大学科技园,哈尔滨150001 [2]哈尔滨工程大学理学院,哈尔滨150001

出　　处：《光学学报》2006年第7期1001-1006,共6页Acta Optica Sinica

基　　金：国家自然科学基金(60577005);教育部高校优秀青年教师教学科研奖励计划资助课题

摘　　要：提出了一种新颖的基于四芯光纤的弯曲传感器,可用于弯曲测量。该传感器采用一段四芯光纤作为敏感单元,四芯光纤的四个纤芯作为一个四光束干涉仪,在光纤出射端远场形成周期分布的干涉格子。该四光束干涉仪的干涉相位差是光纤弯曲曲率半径的函数,因而,弯曲曲率半径的变化可导致格子光场的移动。波长为650 nm的低相干半导体激光二级管被用来做为光源,所形成的干涉格子光场由CCD探测器记录。理论上,建立了远场格子图案强度分布函数与曲率半径的关系,并得到了实验的验证。A novel four-core fiber-based bending sensor has been proposed, in which four-core fiber is used as the sensing element, the four cores of the fiber act as a four-beam interferometer, and the far-field interferogram grids with periodical distributions are formed on the fiber output end. The phase difference is a function of the radius of curvature, so the change of the radius of curvature shifts the far-field interferometric grid pattern. A low-coherence laser diode with wavelength of 650 nm is adopted to illuminate the fiber and the interferogram pattern in the far-field is recorded by a CCD camera. The relationship between the far-field grid pattern intensity distribution and the radius of curvature is established theoretically and confirmed experimentally.

关 键 词：光纤光学 四芯光纤 弯曲传感器 远场 格子图案 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置] TN253[自动化与计算机技术—控制科学与工程]