Υλικά και διατάξεις για υδρόφωνα και ακουστικές μετρήσεις

Μότση, Νεφέλη

dc.contributor.author	Μότση, Νεφέλη
dc.date.accessioned	2025-09-22T09:51:26Z
dc.date.available	2025-09-22T09:51:26Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/62520
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.30216
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	PZT	el
dc.subject	Βa(1-x)SrxΤiO3	el
dc.subject	Διακρίβωση υδροφώνων	el
dc.subject	Υδρόφωνα	el
dc.subject	Πιεζοηλεκτρικά υλικά	el
dc.subject	BaTiO3	el
dc.title	Υλικά και διατάξεις για υδρόφωνα και ακουστικές μετρήσεις	el
dc.contributor.department	Εργαστήριο Ηλεκτρονικών Αισθητηρίων	el
heal.type	doctoralThesis
heal.classification	Physics, Chemical engineering and Material science	el
heal.language	el
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2025-07-07
heal.abstract	Acoustic sensors are devices designed to detect sound waves. Sensors that detect sound waves in the air are microphones, and sensors that detect sound waves underwater are hydrophones. Acoustic sensors transform sound waves into electrical signals thus making further analysis possible. Acoustic sensors have a wide range of applications in industry, medicine, and military defense. For example, in the detection of underwater targets, in the study of underwater organisms and ecosystems, and in communications. As part of the preparation of this PhD Thesis, hydrophones were initially developed using commercial piezoelectric discs consisting of Pb(Zr(1−x)Tix)O3 (PZT) of different technical characteristics and dimensions, as sensing elements, and their acoustic response was studied. Following this, an electrical circuit was designed to improve the acoustic performance of the hydrophone and to allow for further processing and analysis on a computer. The hydrophone was calibrated using the method of substitution and its performance was compared to that of commercially manufactured hydrophone in terms of its acoustic response. Last but not least, the sol-gel and solid-state reaction techniques were used to develop barium titanate (BaTiO3) and Ba(1-x)SrxTiO3 (0≤x≤0.8) piezoelectric sensing materials, with the ultimate objective of replacing PZT. These sensor materials can then be used as acoustic sensor elements in sound measurements and hydrophone development.	el
heal.advisorName	Χριστοφόρου, Ευάγγελος
heal.committeeMemberName	Κόλλια, Κωνσταντίνα
heal.committeeMemberName	Κτενά, Αφροδίτη
heal.committeeMemberName	Μανωλάκος, Δημήτριος
heal.committeeMemberName	Κυρίτσης, Απόστολος
heal.committeeMemberName	Χουρδάκης, Εμμανουήλ
heal.committeeMemberName	Παναγόπουλος, Γεώργιος
heal.academicPublisher	Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών	el
heal.academicPublisherID	ntua
heal.numberOfPages	265
heal.fullTextAvailability	false