Measurement of head/disk spacing modulation using a two channel fiber optic laser Doppler vibrometer

Author

Riener, Timothy A. ; Goding, Adrian C. ; Talke, Frank E.

Author_Institution

Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

2745

Lastpage

2747

Abstract

A two-channel laser Doppler vibrometer system is described for studying spacing modulation of the head/disk interface in a magnetic recording disk file. Three types of sliders, namely a standard two-rail slider, an experimental negative-pressure slider, and a cross-cut slider, are studied. In comparing the results from the single-channel and dual-channel laser Doppler systems, excellent agreement is observed for the resonant frequencies of the air bearing. The single-channel system, however, exhibits problems with offset in the velocity and displacement signals that are absent with the two-channel system

Keywords

Doppler effect; displacement measurement; fibre optic sensors; magnetic disc storage; magnetic heads; measurement by laser beam; velocity measurement; vibration measurement; air bearing; cross-cut slider; displacement signals; fiber optic; head/disk spacing modulation; laser Doppler vibrometer; magnetic recording disk file; measurement; negative-pressure slider; resonant frequencies; standard two-rail slider; two-channel system; Doppler shift; Fiber lasers; Frequency; Laser beams; Magnetic heads; Motion measurement; Optical fiber polarization; Optical fibers; Photodiodes; Vibrometers;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92232

Filename

92232