光纤Bragg光栅可变灵敏度液位传感器设计  

Design of variable sensitivity liquid level sensor for FBG

作　　者：李凯[1,2] 蔡陈[1] 赵振刚[1] 梁仕斌 李川[1] 

机构地区：[1]昆明理工大学信息工程与自动化学院,云南昆明650500 [2]云南电网有限责任公司电力科学研究院研究生工作站,云南昆明650217 [3]云南电力试验研究院(集团)有限公司,云南昆明650217

出　　处：《传感器与微系统》2016年第3期121-123,共3页Transducer and Microsystem Technologies

基　　金：云南省应用基础研究计划资助项目(2013FZ021);国家自然科学基金资助项目(KKGD201203004)

摘　　要：为了实现对液位的多灵敏度状态下监测,设计了一种利用光纤Bragg光栅(FBG)的可变灵敏度液位传感探头。将薄膜片上的液体压力通过传压杆传送给悬臂梁,将FBG粘贴于悬臂梁上表面,利用灵敏度变换阀改变悬臂梁长度而改变传感器的灵敏度。对悬臂梁进行有限元仿真优化计算,得到悬臂梁的变形特性。悬臂梁长度分别调节为100,90,80 mm状态下,最大变形出现在悬臂梁尖端,分别为4.266,3.457,2.736 mm,裸光栅粘贴处,对应的灵敏度分别为2.0,1.5,1.0 mm/m,实现灵敏度变换。In order to achieve level of variable sensitivity monitoring is designed using a fiber Bragg grating （FBG） with variable sensitivity level probe. Liquid pressure on film is transmitted to cantilever beam through pressure bar, FBG is pasted on upper surface of cantilever beam,using sensitivity shift valve to change cantilever length, so as to change sensitivity of sensor. Calculated deformation properties of the cantilever beam by finite element simulation and optimization. The length of cantilever beam are adjusted to 100 mm, 90 mm, 80 mm. In all the above-mentioned states, the maximum deformation occurs in the tip of cantilever beam, which are 4. 266, 3. 457,2. 736 mm respectively. Corresponding where bare grating pasted, the sensitivitues are 2.0,1.5,1.0 mm/ m, to achieve sensitivity transformation.

关 键 词：液位 传感器 有限元 光纤BRAGG光栅 可变灵敏度 

分 类 号：TH741[机械工程—光学工程]