Optical design of a detection device for hard disk platter surface defects
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College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
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Received Date:
2011-05-10
Accepted Date:
2011-06-14
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Abstract
In order to detect whether the surface defect grade of a hard disk platter meet the standard,a detection device was designed according to scattering theory of light,experimental result and roughness grade of the hard disk platter surface defects.Four models of surface scattering were discussed based on scattering phenomenon when light incident on rough surfaces,scattering property and model constitution of scattering objects.With the help of an optical design software,the optical system of detection device was designed based on mixed scattering model.The results indicated scattering angle and scattering power density of mixed type was maximum,so it was optimum to reflect scattering phenomenon of the hard disk platter surface defects.
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