双曲面压电复合材料温度稳定性研究

Temperature stability of hyperboloid piezoelectric composite

双曲面压电复合材料在实际应用中易受温度影响而产生形变,影响换能器性能,但是目前很少有针对其温度稳定性的研究。提出一种基于光纤光栅传感法测量双曲面压电复合材料温度形变的方法,测试-40~100℃范围内双曲面压电复合材料的相关性能参数。结果表明:双曲面压电复合材料x、y、厚度方向的形变随温度升高而增大,在60℃后趋于稳定;谐振频率随温度升高而减小,在100℃时降低了约18 kHz;频率常数相对变化率随温度升高先下降,后在20℃时升高;机电耦合系数和相对介电常数随温度升高而增大,在100℃时分别达到了0.72和996。

The hyperboloid piezoelectric composite materials are susceptible to deformation due to the influence of temperature in practical applications,which affects the performance of the transducer.However,there are few studies on the temperature stability of hyperboloid piezoelectric composites at present.A method based on fiber grating sensing was proposed to measure the temperature deformation of hyperboloid piezoelectric composite material,and the relative performance parameters of hyperboloid piezoelectric composite material in the range of-40~100℃were tested.The results show that the deformation of the hyperboloid piezoelectric composite material in the x,y,and thickness directions increasees with the increase of temperature,and tends to be stable at 60℃.The resonant frequency decreases with the increase of temperature,reaching about 18 kHz at 100℃.The relative change rate of the frequency constant first decreases with the increase of temperature,and then increases at 20℃.The electromechanical coupling coefficient and relative permittivity increase with the increase of temperature,reaching 0.72 and 996 respectively at 100℃.