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Vol. 145, No. 10, September 2012, pp. 50-64




Measure of the Conductivity by Electromagnetic Inductive Sensor
Rouane Amar

Université de Lorraine, LIEN, EA3440, Nancy, 54000, France

Tel.: +33383684157, fax: +33383684153

E-mail: amar.rouane@univ-lorraine.fr




Received: 16 July 2012   /Accepted: 22 October 2012   /Published: 31 October 2012

Digital Sensors and Sensor Sysstems


Abstract: In order to improve the quality of life of the diabetic patients a non-invasive glucose level monitoring remains the most attractive approach for diabetic patients. A non-invasive approach will allow to do more frequent measurements of blood glucose without the painful sensation endured during skin prick. A technique of the electromagnetic coupling allowed us to correlate to glucose concentration with the change in conductivity in the blood. The variation of dielectric parameters is characterized by the measure of the ratio of the output and input signal. The present work developed here allows us to examine the importance of the conductivity measurements. We want to demonstrate the ability of inductive electromagnetic sensor to measure the conductivity of solution and validate this ability by the measurements on standards solutions of known conductivity. The output voltage V increases for 67 %, when the conductivity increases from 0.773 S/m to 1.711 S/m. The ratio V /VI increases for 72 % when the conductivity increases from 0.773 S/m to 1.711 S/m. For the variation of the conductivity of 0.48 S/m to 0.78 S/m, the model gives a relative variation on the V /VI ratio of 48 %. For the same variation of the conductivity, this result is very close to the one obtained in experimental tests, with a relative variation of 43 %.


Keywords: : Electromagnetic inductive sensor, Measurement of conductivity, Glycemia, Indirect non-invasive measure



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