作　　者： ; ; ; ; ;

机构地区： 华南师范大学物理与电信工程学院

出　　处： 《国外电子测量技术》 2019年第7期43-51,共9页

摘　　要： 为解决电泳光散射法测量Zeta电位在较低电泳电压情况下,多普勒频移量与系统的低频频谱分量较难分辨的问题。基于RA150/13/30型压电陶瓷(PZT),研制了应用于Zeta电位分析仪的光学移频装置。该装置主要包括了压电陶瓷驱动电路和其固定机械结构。然后,将该装置安装在Zeta电位实验装置的光路中,对400nm的聚苯乙烯乳胶球标准颗粒悬浮液,进行了光学移频和稳定性测试。分别设置不同的频率和电压幅度的锯齿波驱动信号进行了光学移频试验,结果表明光学移频装置可调节光学移频的线性范围为20~300Hz,光学移频的频率分辨率小于0.02Hz,光学移频与驱动信号电压幅度的线性拟合均超过0.99;光学移频量的标准差不超过0.28。综上所述,表明所研制的光学移频装置准确可靠,在Zeta电位测量装置中将具有广泛的应用前景。 In order to separate the Doppler shift and low frequency spectrum of the system when measuring the Zeta potential in low electrophoretic mobility by electrophoretic light scattering method,an optical frequency shifting device for the Zeta potential analyzer is developed,which is based on the RA150/13/30 piezoelectric ceramic(PZT).The device mainly includes a driver circuit of the piezoelectric ceramic and a pedestal for mounting it.Then,the device is installed in the light path of the Zeta potential experiment device,and its capabilities are testified by the performance test.The quantities of optical frequency shift and its stability are measured by detecting on the 400 nm polystyrene standard particle suspension.Within these experiments,the frequency shifts are altered by setting the drive signals with different frequencies and voltages respectively.The results show that the optical frequency shift ranges from 20 to 300 Hz,the resolution of the frequency is less than 0.02 Hz,and the linear correlation coefficient R2 are all more than 0.99 in different conditions.The standard deviation of the optical shift frequency is less than 0.28.In summary,the developed optical frequency shifting device based on PZT is accurate and reliable,and the application of the device in Zeta potential measurement will be used widely.

关 键 词： 电陶瓷 光学移频装置 电泳迁移率 电位 反激式开关电源

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