公开(公告)号：US20190293421A1

公开(公告)日：2019-09-26

申请号：US16465576

申请日：2017-12-29

Applicant: XI'AN JIAOTONG UNIVERSITY

Inventor： Xueyong Wei ,  Yinsheng Weng ,  Shudong Wang ,  Dong Pu ,  Zhuangde Jiang

IPC: G01C9/06 ,  G01P15/18

Abstract: A frequency detection method based on synchronous oscillation of resonators, and a tilt sensor using the frequency detection method are disclosed. The sensor includes a detecting unit and a synchronization unit which are respectively disposed in a first oscillating circuit and a second oscillating circuit for forming two self-excited oscillators. The detecting unit and the synchronization unit are electrostatically coupled through a plate capacitor to allow a weak synchronous current to pass through, which affects and reduces phase noise of the self-excited oscillator formed by the detecting unit, thereby greatly improving the frequency stability thereof and simultaneously reading out a natural frequency thereof through a frequency counter. Three detecting units are respectively evenly distributed at a periphery of a hexagonal mass block through magnifying beams. The mass block is configured to sense a gravitational acceleration. The gravitational acceleration is converted into a compressive or tension stress to be applied to the magnifying beams, and then the stress is amplified by the magnifying beams to be applied to the detecting units, so as to change a self-oscillation frequency of the detecting units for forming three synchronous self-oscillation circuits. Through the oscillation frequency and the oscillation frequency variation of the three synchronous self-oscillation circuits, the acceleration magnitude and direction of the entire sensor are deduced.