A High Precision Stray-immune Weak Capacitance Measurement System for Gas-solid Two-phase Flows Detection

DOI

10.2991/iea-15.2015.36How to use a DOI?

Keywords

capacitance measurement; weak capacitance; direct digital synthesizer; stray-immune.

Abstract

A novel weak capacitance measurement system is proposed to measure the gas-solid two-phase flows. The system is mainly consist of capacitance sensor, Micro-programmed Control Unit (MCU), Direct Digital Synthesizer (DDS), operational amplifier, analogue multiplier and low-pass filter. Since the stray capacitance is much larger than the variation of measured capacitance, the stray capacitance should be eliminate by the measurement system. The experimental results show that the system meets the application requirement, and has good linearity, high measurement accuracy and stray-immune. The result of the percentage error is about 0.6% and the non-linear error is less than 1.5%. The sampling rate which is related to the frequency of the signal generator and the MCU clock can reach 500 kps.

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/).

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TY  - CONF
AU  - Song Feihu
AU  - Hong Hui
AU  - Liu Shuai
PY  - 2015/09
DA  - 2015/09
TI  - A High Precision Stray-immune Weak Capacitance Measurement System for Gas-solid Two-phase Flows Detection
BT  - Proceedings of the AASRI International Conference on Industrial Electronics and Applications (2015)
PB  - Atlantis Press
SP  - 143
EP  - 146
SN  - 2352-5401
UR  - https://doi.org/10.2991/iea-15.2015.36
DO  - 10.2991/iea-15.2015.36
ID  - Feihu2015/09
ER  -