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Storage Life Evaluation of Quartz Accelerometer Servo Circuit Based on Drift Brownian Movement

The research object of this paper was the servo circuit of quartz accelerometer. The evaluation method based on drift Brownian movement was proposed to evaluate the storage reliability and storage life of servo circuit. Based on the characteristic of the servo circuit of quartz accelerometer, an accelerated model was established. Then, the reliability evaluation model was generated combined with linear drift Brownian movement. Using the degradation data of servo circuit acceleration storage, the storage life of servo circuit was evaluated. The evaluated results were reasonable, and the feasibility of the method was validated. Introduction Quartz accelerometers are typical high-precision mechanical and electrical products that are widely used in aerospace, transportation, and other fields in China. The quartz accelerometer consists of a servo-integrated hybrid circuit part, a process structure part (quartz pendulum), and a basic material part (viscose, magnetic material) [1][2]. The composition material and the process are complex, and the accuracy is required to be high. Quartz accelerometers have characteristics that degrade over time. Various factors, such as aging, magnetic degradation, and circuit drift, can cause degradation of their accuracy. Among them, degradation of parameters such as circuit voltage and current caused by degradation of the servo circuit performance will directly lead to the failure of the accelerometer. In general, degradation of servo circuit performance is a slow process, and accelerating methods are used in engineering to evaluate its degradation process. However, due to the high degree of uncertainty in the degradation of servo circuit performance, it poses a challenge for reliability evaluation. In order to evaluate the storage life and reliability index of quartz accelerometer servo circuit, the accelerated degradation test method can be used to shorten the test time and save cost. According to a large number of documents, the reliability evaluation method based on drift Brownian motion is more suitable for reliability evaluation based on performance degradation data. Therefore, this article accelerates the test data obtained by the storage degradation test through the servo circuit and uses the reliability evaluation method based on the drift Brownian motion to evaluate the storage life of the quartz accelerometer servo circuit. Composition and the Main Performance Parameter of Servo Circuit At present, the servo circuit commonly used by domestic quartz flexible accelerometer manufacturers is the hybrid integrated servo circuit HB309. The HB309 is a dedicated capacitive sensor servo circuit that is connected to a quartz meter to form a complete accelerometer. The HB309 hybrid servo circuit