Life Test and Evaluation Technology of Long Life Piezoelectric Acceleration Sensor
Aiming at the difficulty of evaluating the life of long-life sensors,a method of evaluating the life and reliability of long-life piezoelectric acceleration sensors is proposed in this paper.Through the physical characteristics,electrical characteristics,environmental characteristics and stress analysis of the piezoelectric acceleration sensor product,the failure criterion is determined,the sensitive element is determined according to the characteristic analysis and stress analysis,and the test method is formulated as temperature-vibration composite stress test,the two-factor and two-level orthogonal test design is carried out,and the zero-point output in the product test at normal temperature is measured and the curve is drawn.The pseudo life data of the product is extrapolated by linear fitting of the curve,and the reliable life of the product under normal stress is obtained by substituting the generalized log-linear model and solving the model parameters.It is determined that the normal working stress of the product is 95%and the reliability life is more than 25 years,which meets the life and reliability requirements of the product in various application scenarios.It is concluded that the temperature vibration combined stress test and its data analysis method can effectively evaluate the life and reliability indexes of long-life piezoelectric acceleration sensors,which has certain reference and practical significance in engineering practice.
piezoelectric acceleration sensorcombined stressaccelerated life testzero drift
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