弹光调制器压电晶体阻抗匹配特性的研究

根据弹光调制干涉具的工作原理,利用等效电路的方法,对压电晶体的阻抗特性进行了分析与计算,推导出了压电晶体与信号源间的理想匹配条件,得出了匹配网络中电感、电容的理论关系.根据理论关系,在信号源与压电晶体间作相应的阻抗匹配,搭建系统并进行相关实验验证.实验结果表明,通过该阻抗匹配网络,可使弹光调制干涉具的振动性能达到最佳,提高了驱动控制器的电品质因数,进而将弹光调制干涉具调制光程差提高了40％,达到了提高弹光调制傅里叶变换光谱仪光谱分辨率的目的.

Research on Impedance Matching Features of Piezoelectric Crystal for Photoelastic Modulated Interfermeter

According to the principle of photoelastic modulated interfermeter, the impedance matching features of piezoelectric crystal has been analyzed and calculated firstly based on the equivalent circuit method,then the ideal matching condition between the piezoelectric crystal and the signal source has been derived,and finally the theoretical relation of inductance and capacitance in the impedance matching network has been obtained.In order to validate the proposed theory, some impedance matching experiments are designed and implemented.The experiment results indicate that the vibration performance of photoelastic modulated interfemeter has been optimized after using the impedance matching network. Meanwhile,the electronic quality factor of the driving controller is raised so that it leads to 40% increase of optical path difference, which improves the spectral resolution of the photoelastic modulated Fourier transform spectrometer.