Simultaneous Three-Wavelength Interferometry for Head/Tape Spacing Measurement

[+] Author and Article Information
E. Baugh, F. E. Talke

University of California, San Diego, La Jolla, CA 92093

J. Swenson

Imation, Oakdale, MN 55128

J. Tribol 120(3), 549-553 (Jul 01, 1998) (5 pages) doi:10.1115/1.2834585 History: Received May 02, 1996; Revised July 27, 1997; Online January 30, 2008


Instrumentation for the simultaneous acquisition of three monochromatic interference patterns for the measurement of head/tape spacing in magnetic tape drives is described. An algorithm to process the three images using a weighted average method into a map of the head/tape spacing and an estimated contact pressure map is presented. Both experimental evidence and Monte-Carlo simulation indicate that the three-wavelength technique is an improvement over standard monochromatic techniques. Sample one- and two-dimensional measurements are given.

Copyright © 1998 by The American Society of Mechanical Engineers
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