A novel differential piezoelectric acceleration sensor was introduced. The sensor's structure and operating principle were presented and its mathematic model was established

then the relationship between the sensor's output characteristic and inertial mass and the piezoelectric components was discussed. Finally

the process circuit structure of sensor and its characteristic were discussed also. Experimental results show that the sensor with one inertial mass can realize the differential measurement of acceleration signals

and it has advantages in simple structure

light weight

simple for working and manufacturing

and better anti-interference ability. Its linearity is up to 0.1%

which is half of common accelerometer. It has satisfied the design purpose in frequency response error of 1% and repeatability of 1.27%

and its measurement sensitivity is twice of general accelerometer.