摘要
设计了一种基于双光纤布喇格光栅的新型液位传感器,导出了双光纤布喇格光栅的波长漂移差与液位的关系。圆盘上受到的液体压力导致等腰三角形悬臂梁变形,从而导致安装在悬臂梁两边的光纤布喇格光栅的布喇格波长漂移。通过检测两个布喇格光栅的波长漂移差,得到被测液位。双光纤布喇格光栅通过补偿温度效应,解决了光纤布喇格光栅传感器的交叉敏感问题。该液位传感器的动态测量范围为2～3000mm。实验表明,双光纤布喇格光栅的中心波长随液位的增加分别向长波和短波方向漂移,而带宽几乎不变,实验和理论符合较好,该设计方案是切实可行的。
A novel optical fiber liquid-level sensor based on a couple of fiber Bragg gratings （FBGs） has been designed. The relationship between the liquid-level and the wavelength shift difference of the FBGs is derived. The pressure of the disc results in the distortion of an isosceles triangle cantilever structure. The distortion results in the wavelength shift of a couple of FBGs that are mounted at either side of the cantilever. By monitoring the wavelength shift difference of the two FBGs,the liquid-level can be obtained. The cross sensitive problem of the FBGs sensor can be solved by compensating the temperature effect. The central wavelength of two FBGs shifts to the shorter and longer wavelength respectively with the rise of the liquid-level,while the bandwidth is almost unchanged. The experimental results are in good agreement with the theoretical analysis and verify the feasibility of the proposed sensor with a measurement range from 2 to 3 000 mm.
出处
《压电与声光》
CAS
CSCD
北大核心
2009年第6期811-813,共3页
Piezoelectrics & Acoustooptics
基金
山东理工大学科技基金(2005KJM27)
山东省自然科学基金资助项目(2004ZX30)
关键词
光纤传感器
液位传感器
液位测量
光纤布喇格光栅
fiber optic sensor liquid-level sensor liquid-level measurement fiber Bragg grating
