Piezoresistor

The utility model discloses a piezoresistor, which comprises a protective shell radiating fin, a conducting rod and a piezoresistor body, the piezoresistor body is fixedly connected to the inner surface of the protective shell used for protecting the piezoresistor body, and the outer surface of the protective shell is fixedly connected with the radiating fin used for radiating. The conducting rod penetrates through the protective shell and is electrically connected with the piezoresistor body and the power supply, an interface is formed in the surface of the conducting rod, a protection mechanism for protecting the piezoresistor body from being damaged due to overheating is arranged at the position, corresponding to the interface, of the inner surface of the protective shell, and the piezoresistor body can be automatically disconnected through the protection mechanism when the temperature of the piezoresistor body is too high; and through the temperature control spring, the piezoresistor body can be continuou