Andrews, Ian (1975) An Optical Technique for Analysis of the Behaviour of Flying Heads in Computer Disc Files. Japanese journal of applied physics, 14 (Suppl.). pp. 373-377. ISSN 0021-4922

The evolution of computer disc files to the current levels of high density information storage
has resulted in the development of high sensitivity, low-flying recording heads. An interferometer
is described which was designed especially for the analysis of the flight characteristics of such
heads. It is capable of detecting nano-metres differential motion between a head and disc in the
presence of several tens of micro-metres of disc run-out. To achieve this mode of operation, differential
design and polarisation effects have been employed. The final instrument has, in addition
to fulfilling its design requirement, proved to be a versatile high precision measurement tool.

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