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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。
A fiber optic vibrating wire fiber Bragg grating (FBG) accelerometer was designed and a novel highly sensitive and adjustable optical fiber mass vibration structure was designed. Based on the expected performance of the sensor, the structural dimensions were optimized by finite element analysis. After vibration table calibration experiments, the sensitivity of the sensor up to 108.6pm / g (100Hz), linear response error of less than 2.5%, repeatability error of less than 0.03%, the resonance frequency of about 250Hz. The experimental calibration sensitivity and resonance frequency and the finite element simulation results are consistent. Finally, the diesel engine cylinder head vibration test is carried out. The test shows that the sensor made in this paper can monitor the acceleration of the cylinder head vibration in the working state of the engine on line and can be applied to the test of engine vibration.