Optical system design for crack inspections using magneto-optical imaging

Qingying Hu; Richard Dougherty; Phil Bondurant

doi:10.1117/12.870050

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11 November 2010 Optical system design for crack inspections using magneto-optical imaging

Qingying Hu, Richard Dougherty, Phil Bondurant

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Proceedings Volume 7855, Optical Metrology and Inspection for Industrial Applications; 78550A (2010) https://doi.org/10.1117/12.870050
Event: Photonics Asia 2010, 2010, Beijing, China

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.

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Qingying Hu, Richard Dougherty, and Phil Bondurant "Optical system design for crack inspections using magneto-optical imaging", Proc. SPIE 7855, Optical Metrology and Inspection for Industrial Applications, 78550A (11 November 2010); https://doi.org/10.1117/12.870050

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