柔性压电纤维复合材料传感器的制备及应用

Fabrication and applications of flexible piezoelectric fiber composites sensor

随着智能器件及物联网的快速发展,柔性可穿戴压电传感器越来越受到人们的广泛关注。本文制备了柔性压电纤维复合材料传感器,证明其检测弯曲应变、弯曲角度和振动加速度的能力。结果表明:在悬臂梁振动试验中,柔性压电传感器的输出电压随着加速度增大呈现线性增加。在远离谐振频率的频率范围内,柔性压电传感器表现出良好的线性度,证明其可以用作传感器来检测振动加速度。在弯曲试验中,输出电压随着弯曲应变的增加而增加,弯曲变形下每微应变的输出电压达到8.54 mV,具有优异的灵敏度。随着弯曲频率的变化,柔性压电传感器输出电压幅值无明显变化,说明其具有良好的传感稳定性。通过10万次循环弯曲测试,其输出电压幅值没有明显下降,证明其具有良好的疲劳性能。

With the rapid development of smart devices and the Internet of Things,the flexible and wearable piezoelectric sensors have received more and more attention.In this paper,a flexible piezoelectric fiber composite sensor was fabricated,and the ability of bending strain,bending angle and vibration acceleration of the sensor were demonstrated.The results show that the output voltage of the flexible piezoelectric sensor presents a linear increase trend with the increase of acceleration in the cantilever beam vibration test.The flexible piezoelectric sensor exhibits good linearity in the frequency range far from the resonance frequency,which proves that it can be used as a sensor to detect vibration acceleration.During the bonding test,the output voltage increases with the increase of bonding strain,and the output voltage per micro strain under bending deformation reaches 8.54 mV,which proves that the sensor has excellent sensitivity.With the change of the bending frequency,the output voltage amplitude of the flexible piezoelectric sensor has no obvious change,demonstrating that it has good sensing stability.The output voltage amplitude does not exhibit obvious decrease after 100000 cycles of bending test,proving that it has good fatigue performance.