论文部分内容阅读
要给现代化通讯、导航及雷达系统提供必要的频谱纯度,就必须减小石英谐振器的加速灵敏度(γ),例如从γ=10~(-10)/g 减小到γ=10~(-12)/g。为了实现这一目的,当前正在研究几种(仅与谐振器有关的)无源法。专门设计的单谐振器和双谐振器是无源法应用的两个实例。应用电子线路的有源法已经进行了研究,它能进一步使振动影响减到1/50。然而,用来实现这种方法的变容二极管的非线性限制了可能达到的最终减小量。本文介绍一种可供使用的有源法。这种方法的原理是应用 SC 切晶体的线性电压～频率特性,而要点在于把相位适当的振动模拟信号电压直接加在晶体电极上。用几块不同的SC 切晶体所做的一系列试验都确认了这种有源法的效果。把晶体振荡器略加修改,是为了加入补偿电压,而不会改变振荡器的电路原理。补偿测试范围:加速度1至14g,振动频率50至500Hz;补偿电压大小取决于γ的初值,可从-20至+20V(峰-峰值)。初步实验结果表明,在不连续的频率上γ值几乎能降低三个数量级,在50到500Hz 连续频率范围能降低一个数量级。
To provide the necessary spectral purity for modern communications, navigation and radar systems, it is necessary to reduce the acceleration sensitivity (γ) of quartz resonators, for example from γ = 10 -10 / g to γ = 10 - 12) / g. To accomplish this, several passive methods (resonator-only) are currently under study. Specially designed single and dual resonators are two examples of passive applications. Active methods using electronic circuits have been studied to further reduce the effects of vibration to 1/50. However, the non-linearity of varactor diodes used to implement this method limits the final reduction that may be achieved. This article describes an active method that can be used. The principle of this method is to apply the linear voltage to frequency characteristics of SC-cut crystals, but the point is that the phase-appropriate vibrating analog signal voltage is applied directly to the crystal electrode. A series of experiments with a few different SC-cut crystals confirmed the effectiveness of this active method. The crystal oscillator slightly modified in order to join the compensation voltage, without changing the oscillator circuit. Compensation test range: acceleration 1 to 14g, vibration frequency 50 to 500Hz; compensation voltage depends on the initial value of γ, from -20 to +20 V (peak - peak). The preliminary experimental results show that the γ value can be reduced by almost three orders of magnitude at discrete frequencies and an order of magnitude lower in the continuous frequency range of 50-500 Hz.