An Intelligent Instrument for Measuring Liquid Level

Author

Roy, B.K. ; Santhosh, K.V.

Author_Institution

Dept of Eng., Nat. Inst. of Technol., Silchar, India

fYear

2011

fDate

20-22 July 2011

Firstpage

1

Lastpage

5

Abstract

In this paper, we propose a scheme to increase the linearity range of the capacitance level sensor (CLS) and make independent of the permittivity of the liquid used. The capacitance from the CLS is first converted to frequency by a timer circuit and then frequency is converted to voltage by a frequency to voltage converter. The relation is nonlinear and depends on permittivity of liquid. Artificial Neural network (ANN) model is used in cascade with the frequency to voltage converter. This arrangement has the effect of linear relation between level to be measured and the output of the ANN model. Further this is independent of permittivity of liquid used. The proposed ANN-based scheme incorporates intelligence into the sensor. Using Matlab environment the training has been done to design a model of ANN.

Keywords

capacitive sensors; computerised instrumentation; level measurement; neural nets; signal processing equipment; voltage-frequency convertors; artificial neural network model; capacitance level sensor; frequency-voltage converter; intelligent instrument; liquid level measurement; timer circuit; Artificial neural networks; Capacitance; Frequency conversion; Mathematical model; Permittivity; Permittivity measurement; Training;

fLanguage

English

Publisher

ieee

Conference_Titel

Process Automation, Control and Computing (PACC), 2011 International Conference on

Conference_Location

Coimbatore

Print_ISBN

978-1-61284-765-8

Type

conf

DOI

10.1109/PACC.2011.5978861

Filename

5978861