Vibration sensor

A vibration sensor, comprising:

• a vibration assembly including a mass element and an elastic element, the mass element being connected to the elastic element;
• a first acoustic chamber, wherein the elastic element constitutes one of sidewalls of the first acoustic chamber, and in response to an external vibration signal, the vibration assembly vibrates such that a volume of the first acoustic chamber changes;
• an acoustic transducer being in communication with the first acoustic chamber, wherein in response to a volume change of the first acoustic chamber, the acoustic transducer generates an electrical signal;
• and
• a buffer member being connected to the mass element or the elastic element, the buffer member reducing an impact force of the mass element acting on the elastic element during a vibration process of the vibration assembly, wherein the acoustic transducer has a first resonance frequency, the vibration assembly has a second resonance frequency, and the second resonance frequency is less than the first resonance frequency.