Yang Xiao-Tian, Hu Ming, Wang Cheng-Rui, Li Duo, Chen De-Cong, Ouyang Chao-Li, Bai Yan-Zheng, Qu Shao-Bo, Zhou Ze-Bing
MOE Key Laboratory of Fundamental Physical Quantities Measurement, Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
Rev Sci Instrum. 2023 Jun 1;94(6). doi: 10.1063/5.0138361.
The differential transformer is an important component in the front-end electronics of high-precision capacitive position sensing circuits, which are widely employed in space inertial sensors and electrostatic accelerometers. The position sensing offset, one of the space inertial sensors' most critical error sources in the performance range, is dominated by the differential transformer asymmetry and requires a high-precision evaluation. This paper proposes a method to assess differential transformers' asymmetry and realize a prototype circuit to test a transformer sample. The results show that the asymmetry measurement precision can achieve 0.6 ppm for the transformer with an asymmetry level of about -278.2 ppm.
差动变压器是高精度电容式位置传感电路前端电子设备中的一个重要部件，这种电路广泛应用于空间惯性传感器和静电加速度计中。位置传感偏移是空间惯性传感器在性能范围内最关键的误差源之一，它主要由差动变压器的不对称性引起，需要进行高精度评估。本文提出了一种评估差动变压器不对称性的方法，并实现了一个用于测试变压器样品的原型电路。结果表明，对于不对称水平约为-278.2 ppm的变压器，不对称测量精度可达到0.6 ppm。
