全温区近恒预紧力的压电加速度传感器
By designing a conical bolt pad structure and considering the relationship between the coefficient of thermal expansion in the piezoelectric accelerometer, a near-constant preload is achieved across the entire temperature range, solving the problem of sensor performance degradation under high-temperature conditions and improving the sensor's linearity and impact resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XIAMEN UNIV
- Filing Date
- 2022-12-07
- Publication Date
- 2026-07-17
AI Technical Summary
Existing piezoelectric accelerometers suffer from reduced performance at high temperatures due to decreased bolt preload, resulting in increased sensitivity drift and reduced linearity.
A piezoelectric accelerometer with near-constant preload across the entire temperature range is designed. By setting a conical structure between the bolt and the bolt washer and utilizing the relationship between the thermal expansion coefficient and material parameters of the bolt washer, the bolt preload can be kept approximately constant across the entire temperature range. Laser welding is used for encapsulation to ensure stable performance of the sensor in high-temperature environments.
Maintaining minimal changes in sensor preload across the entire operating temperature range improves sensor linearity and shock resistance, reduces sensitivity drift, and enhances performance in high-temperature environments.
Smart Images
Figure CN115792276B_ABST