Title: A gap capacitance method for slider flying height measurement in near-field optical disk drives
Authors: Chen, JW
Liu, TS
Department of Mechanical Engineering
Keywords: flying pickup head;near-field optical disk drive;flying height;gap capacitance
Issue Date: 1-Dec-2004
Abstract: In order to overcome the diffraction limit of conventional optical disk drives, and substantially increase data storage capacity and density, near-field optical disk drives remain to be realized. The slider of a flying pickup head in a near-field optical disk drive has to fly at a stable spacing above the disk surface. To sense the slider flying height, a gap capacitance method is developed in this study to measure capacitance variation between the pickup head and disk surface. The capacitance varying with the flying height is modulated by a Colpitts oscillator. Subsequent demodulation accounts for height variation of the flying pickup head. Measurement results of this method are verified by using a laser Doppler interferometer. (C) 2004 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.mechatronics.2004.06.008
ISSN: 0957-4158
DOI: 10.1016/j.mechatronics.2004.06.008
Volume: 14
Issue: 10
Begin Page: 1141
End Page: 1155
Appears in Collections:Articles

Files in This Item:

  1. 000224824700004.pdf