I. Preface

The effect of the ultrasonic vibrator on the clock quartz oscillator has just been tested. If the frequency of the ultrasound is close to the quartz oscillation frequency. Resonance occurs. The quartz oscillator then creates a locked linearity with the ultrasonic signal, i.e., a resonance. Let's test this out.

Second, the locking process

The low-frequency oscillation port of the single-chip microcomputer F103 is connected to the watch crystal oscillator. The ultrasonic emitter is placed next to the crystal. The DG1062 is used to generate a sine wave of around 32.768kHz with a peak-to-peak value of 10V to drive the ultrasonic transmitter. The oscilloscope measures the 64-way square wave output by the microcontroller and the voltage signal on the ultrasonic transmitter. Now, when the ultrasonic sensor is far away from the quartz crystal, there is no lock between the signal and the ultrasonic wave after the microcontroller is divided. You can see a difference of about 0.5Hz between them. This means that there is no phase lock between the two. When the ultrasonic transmitter is aligned with the quartz crystal, it can be seen that the ultrasonic transmitter signal stops moving under the trigger of the single-chip microcomputer crossover signal. This indicates that both signals are locked.

▲ Figure 1.2.1 The state without ultrasonic locking

▲ Figure 1.2.2 Signal after oscillation locking

Through this experiment, it is shown that external mechanical vibrations can indeed affect quartz oscillators. In particular, ultrasound can change the frequency of the watch's quartz oscillator. If the signal is strong enough, it is possible to lock the quartz oscillator. When the ultrasonic sensor is removed, the oscillator is not locked. put together, and they can be locked between them.

※Summary※

In this paper, experiments verify that clock quartz oscillators may be affected by ultrasound. In particular, when the frequency of the ultrasonic wave is close to the frequency of the quartz oscillator, the quartz oscillator will lock in with the frequency of the ultrasonic wave. If the frequency difference between the two is too large, or if the intensity of the ultrasound is weak, there will be no lock between them. This phenomenon is also a resonance phenomenon in physical systems.