Optical testing of hard disks |
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| Authors: | M Miller RS Lakes S Conner |
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| Institution: | aMM is in the Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USA;bRSL and SC are in the Department of Biomedical Engineering, University of Iowa, Iowa City, IA 52242, USA |
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| Abstract: | A device and methodology for surface testing of hard disk blanks are presented. A beam of laser light is scanned in a spiral pattern across the disk, and surface defects are diagnosed from the modulation of the scattered light. Since acceptable polish marks also scattered significant levels of light, it was necessary to make use of the directional characteristics of the scattered light in the disk test device. |
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| Keywords: | non-destructive testing computer disks defects light scatter |
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