Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1999-08-17
2000-10-10
Font, Frank G.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
356445, G01B 1106
Patent
active
061307491
ABSTRACT:
A system and method for measuring lubricant thickness and degradation, carbon wear and carbon thickness, and surface roughness of thin film magnetic disks at angles that are not substantially Brewster's angle of the thin film (carbon) protective overcoat. A focused optical light whose polarization can be switched between P or S polarization is incident at an angle to the surface of the thin film magnetic disk. The range of angles can be from zero degrees from normal to near Brewster's angle and from an angle greater than Brewster's angle to 90 degrees. This range of angles allows the easy measurement of the change in lubricant thickness due to the interaction of the thin film head, the absolute lubricant thickness and degradation of the lubricant. It also allows the measurement of changes in carbon thickness and the absolute carbon thickness. The surface roughness can also be measured at any of the angles specified above. The present invention generates a histogram from the specular and scattered components of the reflected light, generates a centroid of the histogram and performs a symmetry operation to identify the characteristics of the thin film.
REFERENCES:
patent: 5293216 (1994-03-01), Moslehi
patent: 5726455 (1998-03-01), Vurens
Kudinar Rusmin
Meeks Steven W.
Soetarman Ronny
Candela Instruments
Font Frank G.
Nguyen Tu T
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