Ferrofluid switch for a light pipe

Details Ferrofluid switch for a light pipe Ferrofluid switch for a light pipe

1993-11-15

1994-09-27

Lee, John D.

Optical waveguides

Directional optical modulation within an optical waveguide

Magneto-optic

385 31, 385125, G02B 620

Patent

active

053513193

ABSTRACT:
A ferrofluid controlled switch for a light pipe has a light pipe having a first index of refraction, a fluid responsive to a magnetic field having a second index of refraction, and an enclosure concentrically located around at least a portion of the light pipe for retaining the fluid such that the fluid is capable of assuming two configurations, one adjacent to the light pipe and one separate from the light pipe. A controllable magnetic field device such as a permanent magnet or wire coils are used to transfer the magnetically responsive fluid between said two configurations to reduce the output of the light pipe when the fluid is adjacent to the light pipe.

REFERENCES:
patent: 3995934 (1976-12-01), Nath
patent: 4121884 (1978-10-01), Greenwood
patent: 4201446 (1980-05-01), Geddes et al.
patent: 4384761 (1983-05-01), Brady
patent: 4834497 (1989-05-01), Angel
patent: 5182791 (1993-01-01), Pollack
"Ferrofluids Physical Properties and Applications" Ferrofluids Corporation, 40 Simon St., Nashua, N.H., 03060 1986 (No Month).

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