基于3D打印技术的全绝缘多简支梁光纤Bragg光栅振动传感器研究

Study on bragg grating vibration sensor of fully insulated multi-cantilever beam based on 3D printing technology

设计一种融入3D打印技术,实现在高电压、强电磁场环境下检测振动信号的全绝缘多简支梁光纤Bragg光栅振动传感器。通过3D打印机制作而成,由粘贴于简支梁的光纤Bragg光栅受质量块驱动而产生应变,通过解调光栅波长变化量实现对振动信号的检测;有限元分析振动传感器谐振频率为232.47Hz,应变灵敏度为5.826με·g^-1时,加速度灵敏度为6.991pm·g^-1,表明了传感器理论上的测量带宽及传感器对检测信号的反应程度良好。实验结果表明：传感器谐振频率为240Hz,加速度灵敏度为6.270pm·g^-1,线性度为3.3%,表明了传感器实际的测量带宽及传感器对检测信号的反应程度;材料选用全绝缘的尼龙材料,具有良好的绝缘性。

Design a fully insulated multi-cantilever optical fiber Bragg grating vibration sensor which incorporates 3D printing technology and can detect vibration signal in high voltage and strong electromagnetic field environment.The sensor is made by 3D printer,and the fiber Bragg grating attached to the cantilever beam is driven by the mass of the sensor to produce strain,and the vibration signal is detected by demodulating the change of the grating wavelength.The finite element analysis results show that the resonant frequency of the vibration sensor is 232.47 Hz,the strain sensitivity is 5.826με·g^-1,and the acceleration sensitivity is 6.991 pm·g^-1,shows the theoretical measurement bandwidth of the sensor and the response of the sensor to the detection signal.The experimental results show that the sensor has a resonant frequency is 240 Hz,an acceleration sensitivity is 6.27 pm·g^-1,a linearity is 3.3%,shows the actual measurement bandwidth of the sensor and the response of the sensor to the detection signal.The sensor material is made of fully insulated nylon material,which makes the sensor have good insulation.