Yang Shengqi, Xu Yulei, Xu Yongsen, Ma Tianxiang, Wang Hao, Hou Jinghua, Liu Dachuan, Shen Honghai
Key Laboratory of Airborne Optical Imaging and Measurement, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Sensors (Basel). 2022 Apr 30;22(9):3437. doi: 10.3390/s22093437.
The spherical pair has an important role in the inner frame of the stabilization mechanism of the aviation optoelectronic pod. However, its two-degrees-of-freedom (2-DOF) angular displacement signal is difficult to detect, seriously restricting its application in aviation optoelectronic pods. Therefore, this study proposes a new method to measure a spherical pair's 2-DOF angular displacement using a spherical capacitive sensor. The capacitive sensor presented by this method realizes the measurement of the 2-DOF angular displacement of the spherical pair by integrating the spherical electrode groups in the ball head and the ball socket of the spherical pair. First, based on the geometric structure of the spherical pair, the structure of the capacitive sensor is designed, and the mathematical model for the capacitive sensor is deduced. Then, the sensor's output capacitance, in different directions, is simulated by Ansoft Maxwell software. Finally, an experiment device is built for the measurement experiments. The simulation analysis and experimental results show that the spherical capacitive sensor has an approximately linear output in different directions, and the measured output capacitance is as high as 89.7% of the theoretical value. Compared with the existing sensors that measure the 2-DOF angular displacement signal of the ball pair, the sensor proposed in this study has an integrated structure, which can be integrated into the spherical pair. That makes it possible to apply the spherical pair to the inner frame of the aviation optoelectronic pod.
球形副在航空光电吊舱稳定机构的内框架中具有重要作用。然而，其两自由度（2-DOF）角位移信号难以检测，严重限制了其在航空光电吊舱中的应用。因此，本研究提出一种利用球形电容传感器测量球形副2-DOF角位移的新方法。该方法提出的电容传感器通过将球形副的球头和球窝中的球形电极组集成，实现了对球形副2-DOF角位移的测量。首先，基于球形副的几何结构设计了电容传感器的结构，并推导了电容传感器的数学模型。然后，利用Ansoft Maxwell软件对传感器在不同方向上的输出电容进行了仿真。最后，搭建了实验装置进行测量实验。仿真分析和实验结果表明，球形电容传感器在不同方向上具有近似线性输出，实测输出电容高达理论值的89.7%。与现有的测量球副2-DOF角位移信号的传感器相比，本研究提出的传感器具有集成结构，可集成到球形副中。这使得将球形副应用于航空光电吊舱的内框架成为可能。
