Bar-Cohen Y, Ben-Joseph B, Harnik E. Compact sensitive instrument for direct ultrasonic visualization of defects.
THE REVIEW OF SCIENTIFIC INSTRUMENTS 1978;
49:1709. [PMID:
18699039 DOI:
10.1063/1.1135353]
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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.
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