Interferometer apparatus and method for determining the spatial

Details Interferometer apparatus and method for determining the spatial Interferometer apparatus and method for determining the spatial

1986-08-26

1987-07-21

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356358, G01B 902, G01B 1102

Patent

active

046814477

ABSTRACT:
Interferometer apparatus for determining the spatial relationship of two or more observed points such as the height of a magnetic transducer head as it moves over the surface of a spinning recording disc. A monochromatic light beam having components of characteristic polarization and frequency is separated with one component being directed upon the two observation points one of which may be on the transducer head and other may be on the spinning disc. The other component is simultaneously directed upon a reference surface. The reflected beams are then combined to produce an optical beat frequency which is subsequently detected electronically and converted to a voltage representative of the phase shift between images of the two points and utilized to provide the display of the distance between the two points.

REFERENCES:
patent: 3635552 (1972-01-01), de Lang
patent: 3767307 (1973-10-01), Bowker
patent: 4188122 (1980-02-01), Massie et al.
patent: 4298283 (1981-11-01), Marosch et al.
patent: 4340304 (1982-07-01), Massie
"An Optical Technique for Analysis of the Behaviour of Flying Heads in Computer Disc Files", Andrews, Japan Journal Applied Physics, 14 (1975), pp. 373-377.
"Measuring the Flight Height of Magnetic Heads on Magnetic Disks", Marosch et al., IBM Technical Disclosure, p. 1322, 9-1972.

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