Method and arrangement for removing noise and measurements...

Details Method and arrangement for removing noise and measurements... Method and arrangement for removing noise and measurements...

Filed on

2006-05-23

Date issued

2006-05-23

Examiner

Toatley, Jr., Gregory J. (Department: 2877)

Patent Class

Optics: measuring and testing

SubClass

By light interference

SubSubClass

Having polarization

Type

Reexamination Certificate

Status

active

Patent number

07050173

Description

ABSTRACT:
A method and arrangement for measuring head-media spacing modulation (HMS_Wq) employs a profilometer to measure the surface topography of a disk. A cumulative power spectral density (PSD) distribution is generated from the measured surface topography. Discontinuities and steps are identified in the PSD distribution. The discontinuities and steps are removed to create a corrected PSD distribution. A noise free spectrum is then reconstructed from the corrected PSD distribution.

REFERENCES:
patent: 5600441 (1997-02-01), de Groot et al.
patent: 5710637 (1998-01-01), Matsumoto
patent: 5999261 (1999-12-01), Pressesky et al.
patent: 6618218 (2003-09-01), Kadowaki et al.
patent: 6741357 (2004-05-01), Wang et al.

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