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11 November 2010 Optical system design for crack inspections using magneto-optical imaging
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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