Nonlinearity Analysis and Compensation of Measuring the Moisture Content of Green Sand Based on Capacitance Method

DOI

10.2991/mems.2012.103How to use a DOI?

Keywords

nonlinearity; capacitance method; green sand; moisture content

Abstract

The capacitance method is one of the commonly-used methods for measuring the moisture content of green sand. However, due to the influence of the plate structure, the contact resistance and the parasitic capacitance and so on, there is a big non-linear problem. On the basis of briefly introducing the principle of measuring the moisture content by capacitance method, the nonlinearity of capacitance moisture sensor is analyzed theoretically, and the higher-order harmonics are taken as main reasons. Then, the influencing factors causing the nonlinearity are discussed. Finally, In order to reduce the nonlinear influence, a method for the nonlinear compensation based on the least square is provided and the experiments are performed. The experimental results show that it has good linearity between the input and output of the sensor, and the error is less than 2.0% after nonlinear compensation.

Copyright

© 2012, 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  - SHI Dequan
AU  - GAO Guili
PY  - 2012/12
DA  - 2012/12
TI  - Nonlinearity Analysis and Compensation of Measuring the Moisture Content of Green Sand Based on Capacitance Method
BT  - Proceedings of the 1st International Conference on Mechanical Engineering and Material Science (MEMS 2012)
PB  - Atlantis Press
SP  - 391
EP  - 394
SN  - 1951-6851
UR  - https://doi.org/10.2991/mems.2012.103
DO  - 10.2991/mems.2012.103
ID  - Dequan2012/12
ER  -