Design of planar capacitive type sensor for ""water content"" monitoring in a production line

Tsamis, ED; Avaritsiotis, JN

dc.contributor.author	Tsamis, ED	en
dc.contributor.author	Avaritsiotis, JN	en
dc.date.accessioned	2014-03-01T01:22:04Z
dc.date.available	2014-03-01T01:22:04Z
dc.date.issued	2005	en
dc.identifier.issn	0924-4247	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16464
dc.subject	Capacitive sensor	en
dc.subject	Electrostatic modeling	en
dc.subject	Lock-in amplifier	en
dc.subject	Moisture	en
dc.subject	Water content	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.classification	Instruments & Instrumentation	en
dc.subject.other	Amplifiers (electronic)	en
dc.subject.other	Capacitance	en
dc.subject.other	Computer simulation	en
dc.subject.other	Moisture	en
dc.subject.other	Optimization	en
dc.subject.other	Permittivity	en
dc.subject.other	Problem solving	en
dc.subject.other	Sensitivity analysis	en
dc.subject.other	Capacitive sensor	en
dc.subject.other	Electrostatic modeling	en
dc.subject.other	Lock-in amplifier	en
dc.subject.other	Water content	en
dc.subject.other	Sensors	en
dc.title	Design of planar capacitive type sensor for ""water content"" monitoring in a production line	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.sna.2004.07.008	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.sna.2004.07.008	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	Capacitive type sensors for the measurement of water content of various materials exhibit the serious handicap of the sensitivity dependence on the spacing between sensor and material. The results of theoretical investigation show that is possible under certain conditions, related to the relative scaling of the sensor structure, to minimize the aforementioned problem and thus to construct an inexpensive robust and reliable sensor for industrial use. An optimized system was constructed consisting of two modules the sensing bead and an electronics unit connected through coaxial cables. The sensor head contains driving and sensing plates. The electronics unit accompanying the sensor outputs two voltage signals bearing information about the product's relative permitivity and resistivity coefficient. Many factors affecting the sensor head design are discussed. The response of the sensor is investigated in two cases: with and without presence of a ground plane and for various materials with different dielectric constants. Experimental results are also presented that confirm to a great extent the simulation results. Slight discrepancies observed are explained. (C) 2004 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Sensors and Actuators, A: Physical	en
dc.identifier.doi	10.1016/j.sna.2004.07.008	en
dc.identifier.isi	ISI:000227123500004	en
dc.identifier.volume	118	en
dc.identifier.issue	2	en
dc.identifier.spage	202	en
dc.identifier.epage	211	en