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Proceedings Paper

Quality Control By Diffraction Pattern Analysis
Author(s): Donald C. Mead; Harvey L. Kasdan; Thomas J. Middleton
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Paper Abstract

Diffraction and scattering allow subtle defects to be detected at the high rates required for industrial quality control applications. Flaw detection in textile, transparent plastic, and steel webs has been demonstrated. Similar techniques may also be applied to many non-web problems such as walnut meat inspection, blade sharpness, wire diameter, and small part measurement. Several of these systems are currently under development and will soon take their place on the factory floor. In each of these cases, the diffraction pattern provides all the information necessary to determine product quality so that relatively few samples of the diffraction intensity pattern may be analyzed at high speed to detect the defect. Thus, diffraction pattern analysis offers a significant advantage over video scanning systems (even those based on a laser scanner) by minimizing the amount of data presented to the system for decision making. In most applications, video systems can simply not keep up with the rates required for on-line inspection. On the other hand diffraction systems generally illuminate a relatively large area and are able to operate at speeds required for on-line inspection.

Paper Details

Date Published: 20 October 1975
PDF: 11 pages
Proc. SPIE 0060, Solving Quality Control and Reliability Problems with Optics, (20 October 1975); doi: 10.1117/12.954387
Show Author Affiliations
Donald C. Mead, Recognition Systems, Inc. (United States)
Harvey L. Kasdan, Recognition Systems, Inc. (United States)
Thomas J. Middleton, Recognition Systems, Inc. (United States)


Published in SPIE Proceedings Vol. 0060:
Solving Quality Control and Reliability Problems with Optics
Juan J. Amodei; Harry N. Lowell, Editor(s)

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