Vibration sensor

A vibration sensor, comprising:

• a vibration receiver and an acoustic transducer, wherein:
• the vibration receiver includes a housing, a limiter and a vibration unit,
• the housing and the acoustic transducer form an acoustic cavity,
• the vibration unit is located in the acoustic cavity to separate the acoustic cavity into a first acoustic cavity and a second acoustic cavity,
• the acoustic transducer is acoustically connected to the first acoustic cavity,
• the housing is configured to generate a vibration based on an external vibration signal, the vibration unit changes an acoustic pressure within the first acoustic cavity in response to the vibration of the housing, such that the acoustic transducer generates an electrical signal,
• the vibration unit includes a mass element and a first elastic element, a first side of the first elastic element is connected around a side wall of the mass element, a second side of the first elastic element is connected with the limiter, and the vibration unit includes a second elastic element, connected with the limiter and the acoustic transducer, wherein an area of a side of the second elastic element close to the acoustic transducer is larger than an area of a side of the second elastic element away from the acoustic transducer.