Thermal asperity detection head

Details Thermal asperity detection head Thermal asperity detection head

1997-11-25

2000-06-06

Gibson, Randy W.

Thermal measuring and testing

Distance or angle

Thickness, erosion, or deposition

73105, 360 31, G01B 528, G11B 502, G11B 2736, G01N 2500

Patent

active

060710071

ABSTRACT:
An apparatus for detecting surface variations on a rotating disc includes a slider, suspension assembly, first surface variation sensor, second surface variation sensor, and a controller. The slider is adapted to fly over the disc. The suspension assembly is coupled to the slider to position the slider over the disc. The first surface variation sensor is disposed on the slider, and provides a first sensor signal based upon slider contact with one of the surface variations. The second surface variation sensor is disposed on the slider and spaced from the first surface variation sensor. The second surface variation sensor provides a second sensor signal based upon slider contact with the surface variation. The controller receives the first and second signals and calculates a position of the surface variation based upon the first and second sensor signals.

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