石英晶体测试实验中干扰的消除

Elimination of the Interference in Measurement With Quartz Crystals

Ｙ－切石英晶体的各向异性物理特性，使它在正碰撞或平面冲击波作用条件下能产生压剪波的传播，为实现对材料的压剪加载实验研究提供了条件。由于石英晶体的压电效应，国外采用了ＶＩＳＡＲ技术进行测试。在我们的工作中，首次尝试用锰铜压阻法和电磁质速测量法进行测试。压电效应造成了明显的干扰，妨碍信号的获取。实验中用磁控溅射方法将石英晶体表面镀银层约１μｍ，达到了中和极化电荷、屏蔽极化电场的目的，比较成功地消除了压电干扰，获得了有效的测试信号。

Pressure-shear waves were produced in Y-cut a quartz crystals by normal impact with their linearly elastic anisotropism.This provided a way to research the response of materials under pressure-shear loading,experimentally-Because of the piezoelectricity of quartz,VISAR technique was used in the experemental measureinent abroad. In our work,Manganin piezoresistive method and electric-magnetic partical velocity method were first adoptes for gctting the internal state variation of samples.In our experiment the surfaces of quartz pieces were electroplated with silver lays of IPm thick by means of magnetic controlled shoot,which neutralized polarized current and covered polarized electric field.Lonsequently the piezoelectric interference was eliminated.