A tuning fork is a steel or aluminum alloy sound generator in the shape of a "Y". Various tuning forks can emit pure sounds of different frequencies during vibration due to their different masses, fork arm lengths, and thicknesses. Strike the tuning fork and collect the waveform of sound waves. The experiment found that lightly tapping the tuning fork resulted in a smaller amplitude of the tuning fork and waveform, and the sound produced by the tuning fork was also lower; When the tuning fork is struck again, the amplitude of the tuning fork is large, and the amplitude of the waveform is large. At this time, the sound emitted by the tuning fork is also loud. Explanation: Loudness is related to the amplitude of tuning fork vibration. The larger the amplitude, the louder the volume; The smaller the amplitude, the lower the loudness.

In physics, there is a concept called resonance: when the frequency of the driving force is equal to the natural frequency of the system, the amplitude of the forced vibration of the system is maximized, and this phenomenon is called resonance. The resonance in a circuit actually means that when the excitation frequency in the circuit is equal to the natural frequency of the circuit, the amplitude of the electromagnetic oscillation in the circuit will also reach its peak. In fact, resonance and resonance express the same phenomenon. This phenomenon with the same essence has different names in different fields. Alternating stress: The stress on a member that varies over time.

The insertion type tuning fork densitometer is designed based on the principle of component vibration. This vibrating element is similar to a two toothed tuning fork. The fork body vibrates due to a piezoelectric crystal located at the root of the tooth, and the frequency of the vibration is detected by another piezoelectric crystal. Through phase shifting and amplification circuits, the fork body is stabilized at its natural resonant frequency. When the medium flows through the fork, the change in the mass of the medium causes a change in the resonant frequency.

Sensors work based on the principle of component vibration, with the component part being a tuning fork immersed in the measured liquid. The tuning fork part induces vibration through an internal piezoelectric device fixed at one end of the fork body. The oscillation frequency is detected by a secondary piezoelectric device fixed at the other end of the fork, and the signal is amplified through the top circuit. The density of the liquid is closely related to the vibration frequency during the flow of the measured liquid. When the density of the measured liquid changes, the vibration frequency during the flow of the liquid also changes accordingly.