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Proceedings Paper

Optical system design for crack inspections using magneto-optical imaging
Author(s): Qingying Hu; Richard Dougherty; Phil Bondurant
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Paper Abstract

In general, eddy current sensors are point-based sensors with a very high sensitivity but are very slow because of scanning. Optical visual inspections can be very fast but have difficulty in detection of tiny flaws. Magneto-optical imaging is a hybrid sensing technique that combines the advantages of both the eddy current sensor and the optical visual inspection. It has a very high sensitivity and fast inspection speed up to 100mm per second. This paper discusses the optical system design in a magneto-optical imaging sensor including wavelength selection analysis, image contrast enhancement option, and frame subtraction, etc. Theoretical analysis is given as well as initial testing results.

Paper Details

Date Published: 11 November 2010
PDF: 8 pages
Proc. SPIE 7855, Optical Metrology and Inspection for Industrial Applications, 78550A (11 November 2010); doi: 10.1117/12.870050
Show Author Affiliations
Qingying Hu, QUEST Integrated, Inc. (United States)
Richard Dougherty, QUEST Integrated, Inc. (United States)
Phil Bondurant, QUEST Integrated, Inc. (United States)

Published in SPIE Proceedings Vol. 7855:
Optical Metrology and Inspection for Industrial Applications
Kevin Harding; Peisen S. Huang; Toru Yoshizawa, Editor(s)

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