PDF(2738 KB)
PDF(2738 KB)
PDF(2738 KB)
计及边缘效应的双差动电容式加速度传感器的输出特性
Output Characteristic of Dual Differential Capacitive Accelerometer Considering Edge Effects
为了实现对二维加速度的准确测量,在计及边缘效应的变极距及变夹角的平板电容器电容的基础上,运用计算机数值模拟,研究计及边缘效应的双差动平板电容式加速度传感器和双差动电容角位移传感器的输出特性。数值模拟结果表明,输出特性优化后的双差动平板电容式加速度传感器和电容角位移传感器,其灵敏度不低于1.4 pF/(m·s-2) 和7.5 pF/rad,且均具有良好的线性度;在计边缘效时,可减小这2种传感器的测量误差,对于文中给定的传感器的几何尺寸和测量范围,减小的绝对误差最大值可达约1 m/s2和0.012 5 rad。将双差动平板电容式加速度传感器和双差动电容角位移传感器组合,构成二维双差动电容式加速度传感器,该加速度传感器具有结构简单、测量准确度高等优点,可用于测量线运动和轴向翻滚。
In order to achieve accurate measurement of two-dimensional acceleration, based on the variable pole distance and angle capacitance of the flat plate capacitor taking into account the edge effect, computer numerical simulation is used to study the output characteristics of the double differential flat plate capacitive accelerometer and the double differential capacitive angular displacement sensor taking into account the edge effect. The numerical simulation results show that the optimized output characteristics of the dual differential plate capacitive accelerometer and capacitive angular displacement sensor have sensitivities of no less than 2.15 pF/(m·s-2) and 7.5 pF/rad, and both have good linearity. When calculating the edge effect, the measurement error of these two sensors can be reduced. For the geometric dimensions and measurement range of the sensors given in the article, the maximum absolute error reduction can reach about 1 1m/s2and 0.0125 rad. A two-dimensional dual differential capacitive accelerometer is formed by combining a dual differential planar capacitive accelerometer and a dual differential capacitive angular displacement sensor. This accelerometer has the advantages of simple structure and high measurement accuracy, and can be used to measure linear motion and axial rolling.
力学计量 / 加速度传感器 / 双差动电容 / 边缘效应 / 二维加速度 / 测量误差 / 输出特性
mechanical metrology / accelerometer / dual differential capacitive / edge effects / two-dimensional acceleration / measurement error / output characteristic
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