title: Compact sensitive instrument for direct ultrasonic visualization of defects.
abstract: A simple ultrasonic imaging cell based on the confocal combination of a plano-concave lens and a concave spherical mirror is described. When used in conjunction with a stroboscopic schlieren visualization system, it has the main attributes of a practical nondestructive testing instrument: it is compact, relatively inexpensive, and simple to operate; its sensitivity is fair, resolution and fidelity are good; it has a fairly large field of view and a test piece can be readily scanned. The scope of its applicability is described and discussed.
authors.affiliation: The Racah Institute of Physics, Hebrew University, Jerusalem, Israel.
authors.forename: Y
authors.initials: Y
authors.lastname: Bar-Cohen
authors.forename: B
authors.initials: B
authors.lastname: Ben-Joseph
authors.forename: E
authors.initials: E
authors.lastname: Harnik