High precision capacitance displacement measurement circuit design
- 10.2991/ic3me-15.2015.206How to use a DOI?
- high precision displacement measurement, analog circuit, micro controller
A high resolution digital integrated chip capacitor measurement system was designed.The major components of the system mainly includedmain control chip, capacitance transducer, data storage and communication interface.ARM7-based mcro controllerSTM32F207was used as the main control chip, capacitance measurement chip AD7747produced by AD Company with sensitivity can be up to 20 af was used as capacitance transducer. The capacitance measurement range ofAD7747 is -8 pf to +8pf, the maximum common-mode immutable capacitance can reach17 pf anddata update rate range is between 5 Hz to 45 Hz. The absolute error of test circuit was calculated by the fixed capacity test and error analysis. The final results were obtained after subtracting the absolute error, and the final test error is less than 3%.
- © 2015, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Xuefeng Xing AU - Jianqiang Li AU - Shixue Lv AU - Linlin Xu AU - Xiaopu Zhang PY - 2015/08 DA - 2015/08 TI - High precision capacitance displacement measurement circuit design BT - Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering PB - Atlantis Press SP - 1066 EP - 1069 SN - 2352-5401 UR - https://doi.org/10.2991/ic3me-15.2015.206 DO - 10.2991/ic3me-15.2015.206 ID - Xing2015/08 ER -