High precision capacitance displacement measurement circuit design

DOI

10.2991/ic3me-15.2015.206How to use a DOI?

Keywords

high precision displacement measurement, analog circuit, micro controller

Abstract

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%.

Copyright

© 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/).

Download article (PDF)

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  -