低频光纤布拉格光栅振动加速度传感器研究  

Study on Fiber Bragg Grating Vibration Acceleration Sensor of Low Frequency

作　　者：罗小东[1] 乔学光[1,2] 贾振安[1] 高宏[1] 邵敏[1] 陈国祥[1] 

机构地区：[1]西安石油大学光电油气测井与检测教育部重点实验室,陕西西安710065 [2]西北大学物理学系,陕西西安710069

出　　处：《仪表技术与传感器》2013年第12期7-8,11,共3页Instrument Technique and Sensor

基　　金：国家863计划(2009AA06Z203);西安石油大学青年创新基金(Z06044)项目;陕西省自然科学基金(2011JM8028);陕西省教育厅专项科研计划(12JK0471);陕西省教育厅专项科研计划(11JK0822)

摘　　要：考虑到光纤布拉格光栅（FBG）在振动检测中的优势,针对等强度悬臂梁式光纤布拉格光栅低频振动加速度传感器,对其传感原理、固有频率进行了理论分析,考虑了悬臂梁本身质量对振动系统的影响,得出固有频率理论值为21.1Hz.实验结果表明：在5～16 Hz的频率范围内,该振动加速度传感器具有较平坦的频率响应曲线,加速度灵敏度为21.5pm/m/s2,传感器固有频率20 Hz,实验值与理论值相对误差为5.5％,表明该振动加速度传感器能实现低频加速度的测量.Considering the advantage of fiber Bragg grating （FBG） applied in vibration detection, the sensing theory and natu- ral frequency of the FBG vibration acceleration sensor of low frequency based on uniform strength cantilever beam were theoretically analyzed. In consideration of the cantilever beam＇ s quality which affects vibration system, the natural frequency theory value of 21.1 Hz was deduced. The experimental results show that the frequency response is flat, and the acceleration sensitivity of the sen- sor keeps 21.5 pm/m/s~ at 5 Hz to 16 Hz, and the natural frequency is 20 Hz, which agree well with the theoretical analysis, rela- tive error is 5.5%. The result indicates that the sensor can realize acceleration measurement of low frequency.

关 键 词：振动加速度 光纤布拉格光栅 固有频率 频率响应 

分 类 号：TN253[电子电信—物理电子学]