Title :
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
fDate :
11/1/1988 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
