When external conditions

such as temperature

humidity

pressure change

partial physical characteristics of material will change

tiny deformation of these physical quantities have a great impact on the actual use of the materials.According to the piezoelectric effect and its inverse effect

piezoelectric ceramics are attached to the measuring end of the pressure sensor and double feedback measurement is used to detect the change of the free end of the sample

and feedback adjustment is carried out using micro-programmed control unit（MCU）to control the stepping motor and the precision wire rod.The precise measurement can be automatically followed for a long time by the small deformation of the material

and the parameter characteristic curve can be displayed and stored in real time by the computer software.The measurement results show that the system has many advantages such as full automatic

high precision and long-time on duty measurement.