Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1985-04-30
1986-03-25
Little, Willis
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33327, 33364, 33317R, G01C 1726
Patent
active
045774145
ABSTRACT:
A remotely readable fiber optic compass. A sheet polarizer is affixed to a magnet rotatably mounted in a compass body, such that the polarizer rotates with the magnet. The optical axis of the sheet polarizer is preferably aligned with the north-south axis of the magnet. A single excitation light beam is divided into four identical beams, two of which are passed through the sheet polarizer and through two fixed polarizing sheets which have their optical axes at right angles to one another. The angle of the compass magnet with respect to a fixed axis of the compass body can be determined by measuring the ratio of the intensities of the two light beams. The remaining ambiguity as to which of the four possible quadrants the magnet is pointing to is resolved by the second pair of light beams, which are passed through the sheet polarizer at positions which are transected by two semicircular opaque strips formed on the sheet polarizer. The incoming excitation beam and the four return beams are communicated by means of optical fibers, giving a remotely readable compass which has no electrical parts.
REFERENCES:
patent: 3888016 (1975-06-01), Fowler
patent: 3927474 (1975-12-01), Lapeyre et al.
patent: 4047168 (1977-09-01), Fowler
patent: 4117602 (1978-10-01), Lapeyre
patent: 4446729 (1984-05-01), Watson, III
Garrett Steven L.
Migliori Albert
Swift Gregory W.
Eklund William A.
Gaetjens Paul D.
Hightower Judson R.
Little Willis
The United States of America as represented by the United States
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