Piezoelectric quartz accelerometer

A piezoelectric quartz accelerometer comprising:

• a sensitive element, a signal processing circuit, a base, an outer case, and a socket for leading out signals produced by said signal processing circuit, wherein said base and said outer case are closely attached to become a cavity, said sensitive element and said signal processing circuit are mounted on said base, wherein said sensitive element comprises two round piezoelectric quartz wafers, a first supporting frame and a second supporting frame, wherein said two round piezoelectric quartz wafers are symmetrically mounted on both sides of a centre axial line of said first supporting frame and said second supporting frame;
• said sensitive element further comprises an axial shock buffer unit and a transverse retaining unit for protecting overload of said two round piezoelectric quartz wafers;
• said sensitive element has a sealed cavity which is formed by a sealing cover and a base of said sealed cavity, sealed by a sealing sturcture with a sealing gasket, and fastened by a bolt;
• said signal processing circuit comprises an oscillation circuit for obtaining a frequency signal from said two round piezoelectric quartz wafers under an acceleration, a frequency differential forming circuit for extracting the frequency signal, a phase lock and times frequency circuit for amplifying the frequency signal, compensating zero phase, compensating non-linearization and compensating temperature, and an output circuit for outputting a digital signal having linearization relationship with the acceleration, wherein a magnitude and a polarization of the digital signal precisely reflects a magnitude and a direction of the acceleration.