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使用单个石英谐振器,能够在加上几种激励电压情况下,同时得到几种谐振频率。几个振荡器可以使用同一个谐振器。但在信号幅度增加时,不会出现线性效应。各种不同振动之间的耦合,主要由下列两方面引起:1)振荡器之间的电子耦合。2)振荡材料本身引起的耦合(通过非线性效应)。文中只考虑了两个谐振频率之间的耦合,其实验数据符合 B.V.A 谐振器。为了消除振荡器之间的电子耦合,可用两个隔离的频率综合器对谐振器进行无源测试。主振模的频率变化,是根据其它模的幅度进行测量的。为了明确起见,把这种效应称做间接幅频效应(或引入的幅频效应)。这里介绍的一些特殊情况包括:采用三次和五次泛音和 B 模的5兆赫 AT 切和 SC 切晶体。本文给出了一些实验结果和曲线图,同时提出了一些应用。
With a single quartz resonator, several resonant frequencies can be obtained at the same time with several excitation voltages. Several oscillators can use the same resonator. However, there is no linear effect as the signal amplitude increases. The coupling between various vibrations is mainly caused by the following two aspects: 1) Electronic coupling between oscillators. 2) Oscillation of the material itself caused by the coupling (through the nonlinear effect). In this paper, only the coupling between two resonant frequencies is considered, and the experimental data are in line with the B.V.A resonator. To eliminate the electronic coupling between oscillators, the resonator can be passively tested with two isolated frequency synthesizers. The frequency of the main mode changes, is based on the amplitude of the other mode of measurement. For the sake of clarity, this effect is called indirect amplitude-frequency effect (or amplitude-frequency effect introduced). Some of the special cases presented here include: 5 MHz AT-cut and SC-cut crystals in cubic and fifth overtone and B-mode. In this paper, some experimental results and graphs are given, and some applications are also proposed.