Browse Prior Art Database

Measurement of Flying Height

IP.com Disclosure Number: IPCOM000048057D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Feliss, NA: AUTHOR

Abstract

The spacing between a flying magnetic head and a rotating disk is measured by monochromatic interferometry and by a process for calculating the displacement of interferometric fringes.

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Measurement of Flying Height

The spacing between a flying magnetic head and a rotating disk is measured by monochromatic interferometry and by a process for calculating the displacement of interferometric fringes.

As illustrated, an automated flying height analyzer provides white light from a strobing xenon light source 1 that passes through a half silvered prism 2 in a microscope 3 reflecting onto a glass head 4 and then reflecting from a rotating magnetic disk 5. The light interference of the incident and reflected rays form Newton fringes to appear on the surface of the glass head 4. These fringes are captured and magnified by the microscope and transferred to a TV video camera
6. The white light is filtered using narrow bandpass interference filters 7. The resulting monochromatic fringe pattern is displayed on a TV monitor 8 via a low- level light camera. The video information is simultaneously digitized by a full- screen digitizer 9 which is controlled by a microprocessor 10. The digitized information from the full-screen digitizer is transferred and stored in a semiconductor memory 11 at TV scanning rates. The data is them transferred into a data processor 12, and the data is computer filtered and processed to calculate the head-to-disk separation.

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