静电悬浮加速度计反馈引起闭环点漂移机理及抑制方法

发布时间：2018-04-03 08:51

本文选题：非线性　切入点：闭环点漂移　出处：《中国惯性技术学报》2014年05期

【摘要】：静电悬浮加速度计的检测质量闭环点位置偏离电极框中心时会造成系统非线性误差,调整检测电路输出电压可调整检测质量闭环点,而在调整过程中发现反馈电压变化会引起电容检测电路输出电压漂移,从而影响闭环点调节精度。为解决此问题,研究了闭环点位置与检测电路输出电压变化的关系,推导了检测电路传递函数,初步确定了反馈电压对检测电路输出电压影响的原因是隔直电容选取不恰当,通过实验对比了材料为C0G、Y5P、X7R及SL的多层陶瓷电容作为隔直电容时输出电压与反馈电压关系。实验结果表明:采用低温漂、耐高压和受频率影响小的C0G电容作为隔直电容能够消除反馈对检测电路引起的输出电压漂移,从而消除调节闭环点过程中闭环点位置的漂移,并且能提高检测电路稳定性。
[Abstract]:When the position of the detection quality closed-loop point of the electrostatic suspension accelerometer deviates from the center of the electrode frame, it will cause the nonlinear error of the system. Adjusting the output voltage of the detection circuit can adjust the detection quality closed-loop point.During the adjustment process, it is found that the change of the feedback voltage will cause the output voltage drift of the capacitance detection circuit, thus affecting the precision of the closed-loop point regulation.In order to solve this problem, the relationship between the position of the closed loop and the output voltage of the detection circuit is studied, the transfer function of the detection circuit is derived, and the reason for the influence of the feedback voltage on the output voltage of the detection circuit is that the selection of the isolation capacitance is not appropriate.The relationship between the output voltage and the feedback voltage of the multilayer ceramic capacitors with C _ 0GN _ (Y _ 5P) _ (X _ 7R) and SL as the intersecting capacitors is compared experimentally.The experimental results show that the output voltage drift caused by feedback to the detection circuit can be eliminated by using C0G capacitance with low temperature drift, high pressure resistance and little influence of frequency, and the position drift of closed loop point in the process of adjusting closed loop point can be eliminated.And it can improve the stability of the detection circuit.
【作者单位】：清华大学精密仪器系高精度导航技术教育部重点实验室;
【基金】：清华大学自主科研计划(20091081243)
【分类号】：TH824.4

【共引文献】