光纤光栅液位传感器设计及其灵敏度分析  

Design of FBG Liquid⁃level Sensor and Sensitivity Analysis

作　　者：杨才千[1,2] 唐人杰 文峰 杨宁 李帅 周正[2] YANG Cai-qian;TANG Ren-jie;WEN Feng;YANG Ning;LI Shuai;ZHOU Zheng(College of Civil Engineering,Southeast University,Nanjing 210096,China;College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China;Shandong Institute of Space Electronic Technology,Yantai 264670,China)

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]湘潭大学土木工程与力学学院,湖南湘潭411105 [3]山东航天电子技术研究所,山东烟台264670

出　　处：《仪表技术与传感器》2021年第10期37-41,共5页Instrument Technique and Sensor

基　　金：载人航天预研项目资助(18100040401)。

摘　　要：文中提出了一种灵敏度可调的光纤光栅液位传感器,采用悬臂杠杆结构实现了液位传感器液位响应灵敏的可调性和高灵敏性。通过理论推导,建立了光纤光栅中心波长与液位之间理论计算模型。采用液位传感试验验证了所提出的理论模型,并研究了主要设计参数对液位灵敏度的影响。结果表明:设计的光纤光栅液位传感器具有良好的传感性能,传感器灵敏度与悬臂位置(a/l)及沉管底面积(A)呈现明显线性正比关系,其中心波长与液位变化响应曲线相关性可达0.999,灵敏度可达15.57 pm/cm,能实现液位的精确测量。A sensitivity adjustable fiber bragg grating(FBG)liquid⁃level sensor was proposed in this paper.A cantilever le⁃ver structure was employed to realize adjustable level response sensitivity and high sensitivity of liquid⁃level sensor.By theoretical deduction,a theoretical model was proposed to establish the intrinsic correlations between central wavelength of FBG and liquid⁃level.The proposed theoretical model was verified by liquid⁃level sensor test,the influence of main design parameters on the sensi⁃tivity of liquid level was also studied.The experimental results show that the developed FBG liquid⁃level sensor displays a promis⁃ing sensing performances,and the sensitivity of the sensor is linearly proportional to the cantilever position(a/l)and the bottom area of the immersed tube(A).The correlation between the central wavelength and the response curve of liquid level change can reach 0.999,and the sensitivity can reach 15.57 pm/cm,which can realize the accurate measurement of liquid level.

关 键 词：光纤光栅 液位传感器 液位监测 灵敏度 

分 类 号：TH741[机械工程—光学工程]