Experimental investigations of two ultrasonic lenses are presented, a graded acoustic index lens and a cylindrical lens. The first lens is a short rod which has a graded acoustic velocity profile in the radial direction giving it the ability to focus acoustic waves. Electron probe microanalyses, optical refractive index measurements and acoustic velocity measurements are used to characterize the lens. The ray acoustics approach is used for the theoretical interpretation and the focussing behavior is visualized with a Schlieren system. Potential applications of the lens are discussed. / The cylindrical lens consists of a lead zirconate titanate (PZT) coated wire or optical fibre. The fabrication and evaluation of the lens is described. Ultrasonic measurements of miniature transducers and electronically controllable deflection are demonstrated. A novel laser ablation patterning technique is used to make an interdigital transducer with a 20$ mu$m resolution on the outer electrode of the lens for special applications. Finally, possible applications of the cylindrical lens are outlined.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.59916 |
| Date | January 1991 |
| Creators | Nicolle, Alain J. (Alain Jean-René) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Electrical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001238156, proquestno: AAIMM67473, Theses scanned by UMI/ProQuest. |
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