A Self-Oscillating System to Measure the Conductivity and the Permittivity of Liquids within a Single Triangular Signal
Joint Authors
Francis, Laurent
Druart, Sylvain
Flandre, Denis
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-02-13
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
We present a methodology and a circuit to extract liquid resistance and capacitance simultaneously from the same output signal using interdigitated sensing electrodes.
The principle consists in the generation of a current square wave and its application to the sensor to create a triangular output voltage which contains both the conductivity and permittivity parameters in a single periodic segment.
This concept extends the Triangular Waveform Voltage (TWV) signal generation technique and is implemented by a system which consists in a closed-loop current-controlled oscillator and only requires DC power to operate.
The system interface is portable and only a small number of electrical components are used to generate the expected signal.
Conductivities of saline NaCl and KCl solutions, being first calibrated by commercial equipment, are characterized by a system prototype.
The results show excellent linearity and prove the repeatability of the measurements.
Experiments on water-glycerol mixtures validate the proposed sensing approach to measure the permittivity and the conductivity simultaneously.
We discussed and identified the sources of measurement errors as circuit parasitic capacitances, switching clock feedthrough, charge injection, bandwidth, and control-current quality.
American Psychological Association (APA)
Druart, Sylvain& Flandre, Denis& Francis, Laurent. 2014. A Self-Oscillating System to Measure the Conductivity and the Permittivity of Liquids within a Single Triangular Signal. Journal of Sensors،Vol. 2014, no. 2014, pp.1-11.
https://search.emarefa.net/detail/BIM-1042953
Modern Language Association (MLA)
Druart, Sylvain…[et al.]. A Self-Oscillating System to Measure the Conductivity and the Permittivity of Liquids within a Single Triangular Signal. Journal of Sensors No. 2014 (2014), pp.1-11.
https://search.emarefa.net/detail/BIM-1042953
American Medical Association (AMA)
Druart, Sylvain& Flandre, Denis& Francis, Laurent. A Self-Oscillating System to Measure the Conductivity and the Permittivity of Liquids within a Single Triangular Signal. Journal of Sensors. 2014. Vol. 2014, no. 2014, pp.1-11.
https://search.emarefa.net/detail/BIM-1042953
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1042953