基于ADT的电阻型湿度传感器可靠性评估

摘要

传统的寿命试验对电子元件可靠性进行评估需较长时间.如何快速、准确获取电子元件的性能指标是工程实践和试验研究迫切需要解决的问题.本文以电阻型湿度传感器为研究对象,基于加速退化试验(ADT)的可靠性评估方法,建立加速模型和退化轨迹,结合最大似然估计和最小二乘法求解加速应力下伪失效寿命分布参数,从而得出正常应力水平下可靠度函数.结果表明,采用ADT能够准确获取湿度传感器的可靠性信息,缩短试验周期,此评估方法同样适用于其它电子元件的可靠性研究,存在广泛的应用价值.%The traditional life test to assess the reliability of electronic components would take longer time.How to quickly and accurately obtain the performance practice of electronic components is an urgent problem in engineering tests and test research.This paper uses resistance-type humidity sensors as the research object, is based on accelerated degradation test (ADT) reliability evaluation method to build up accelerated model and degradation path, combines maximum likelihood estimation and least squares method to solve the pseudo-failure life under accelerated stress distribution parameters, and draw the reliability function under normal stress level.The results show that ADT can get accurate information about the reliability of the humidity sensor and shorten the test period.This evaluation method is also applicable to other electronic components reliability study, and there is a wide range of application.