【摘要】 研究了一种光纤振弦式的光纤Bragg光栅(FBG)加速度传感器,设计了一种新颖的高灵敏、可调整的光纤质量块振动结构。根据传感器的预期性能指标,通过有限元模拟分析,优化了结构尺寸。经过振动台标定实验,传感器的灵敏度可达108.6pm/g(100 Hz),线性响应误差低于2.5%,重复性误差低于0.03%,共振频率约为250Hz。其实验标定的灵敏度和共振频率与有限元模拟的结果相吻合。最后进行了柴油发动机缸盖振动测试,试验表明,本文制作的传感器可在线监测发动机工作状态下缸盖振动的加速度变化,可应用于发动机振动的试验。更多还原

【Abstract】 Compared with the traditional electric sensing technology,the fiber optic sensors have the advantages of higher sensitivity,immunity to electromagnetic interference,better insulation,higher temperature and corrosion resistance.It can meet the requirement of modern sensor technology.In order to design a novel vibration sensing structure with high sensitivity,this paper investigates a fiber Bragg grating(FBG)vibrating wire based acceleration sensor.Firstly,the size of structure is determined by finite element analysis.Moreover,the effectiveness of the sensor is verified and its parameters are calibrated by calibration experiment on the platform vibrator.Finally,the sensor is tested by the cylinder cover′s vibration monitor of the engine in internal combustion engine laboratory.The experimental results show this sensor has high sensitivity,which can reach 108.6pm/g(100Hz).Its response error is less than2.5%and repeatability error is less than 0.03%,and the resonant frequency is about 250 Hz.The results of cylinder cover′s vibration monitoring indicate that this sensor can monitor the variation of acceleration very well.更多还原