Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1998-08-19
2000-02-29
Font, Frank G.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
25055928, G01B 2117
Patent
active
060316152
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.
REFERENCES:
patent: 4873430 (1989-10-01), Juliana et al.
patent: 5293216 (1994-03-01), Moslehi
patent: 5726455 (1998-03-01), Vurens
W.C. Leung, W. Crooks, H. Rosen and T. Strand, An Optical Method Using a Laser and an Integrating Sphere Combination for Characterizing the Thickness Profile of Magnetic Media, Sep. 1989, IEEE Transaction on Magnetics, vol. 25, No. 5. pp. 3659-3661.
Steven W. Meeks, Walter E. Weresin, and Hal J. Rosen, Optical Surface Analysis of the Head-Disk-Interface of Thin Film Disks, Jan. 1995, Transactions of the ASME, Journal of Tribology, vol. 117, pp. 112-118.
Steven Meeks and Rusmin Kudinar, The Next Battleground: Head-Disk Interface, Mar. 1998, Data Storage, Test & Measurement, pp. 29-30, 34and 38.
Kudinar Rusmin
Meeks Steven W.
Soetarman Ronny
Candela Instruments
Font Frank G.
Nguyen Tu T.
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