一种基于等强度梁的光纤光栅高频振动传感器  

A Novel FBG High Frequency Vibration Sensor Based on Equi-Intensity Cantilever Beam

作　　者：孙华[1] 刘波[1] 周海滨[1] 苗银萍[1] 兰玉文[1] 

机构地区：[1]南开大学现代光学研究所,光电信息技术教育部重点实验室,天津300071

出　　处：《传感技术学报》2009年第9期1270-1275,共6页Chinese Journal of Sensors and Actuators

基　　金：863项目资助(2006AA01Z217);国家自然基金重点项目资助(60736039);天津市高等学校科技发展基金项目资助(20060609)

摘　　要：以光纤光栅为敏感元件,设计了一种基于钢制等强度悬臂梁结构的高频振动传感器,该传感器由光纤光栅粘贴于等强度悬臂梁的表面而实现。运用材料力学原理对该等强度悬臂梁的共振频率和应变特性进行了推导。采用匹配滤波法解调光信号,并进行了传感探头优化设计,使该传感器实现了温度补偿。在不同环境温度下对任意频率的振动进行了测量实验,结果表明这种振动传感器可以实现高频振动信号的检测,实际上限频率达6kHz,测量频率误差小于0.5%,能够实现温度补偿,且集成度高,结构轻便,具有广阔的实用前景。A novel high frequency vibration sensor based on steel equi-intensity cantilever beam, using fiber Bragg grating as sensing dement,was proposed. The sensor was realized with FBG fixed on the side of the beam. The resonance frequency and characteristic of strain of the beam was analyzed with material mechanics. The optical signal was demodulated based on the matching gratings filter method. With the majorization design, the sensor achieved the function of temperature compensation. Through the tests experiment toward vibration with random frequency in different environment,the result shows the sensor can measure the vibration signal accurately in the range of 100 Hz-6 kHz,and the frequency error is below 0. 5%.

关 键 词：光纤光学 高频振动传感器 匹配光栅滤波 光纤光栅 等强度梁 温度补偿 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]