Shear mode piezoelectric accelerometer

A shear mode piezoelectric accelerometer, comprising:

• a ring-shaped piezoelectric element, comprising an outer ring wall and an inner ring wall;
• a central shaft, made of conductive material and fixed through the inner ring wall of the ring-shaped piezoelectric element;
• a mass block, made of conductive material and comprising a fixed element and a weight element, the fixed element having a fixed hole and being fixed to the outer ring wall of the ring-shaped piezoelectric element by fitting the fixed hole, and the weight element being located on the fixed element and away from the fixed hole;
• a first electrode, electrically connected to the central shaft;
• and
• a second electrode, electrically connected to the mass block,
• wherein the weight element of the mass block rotates relative to the central shaft, whereby the ring-shaped piezoelectric element is deformed and a potential difference is generated between the first electrode and the second electrode.