Patent
1988-07-11
1989-06-27
Lee, John D.
350 9618, G02B 636
Patent
active
048423556
ABSTRACT:
An optical rotary joint for use in a well logging cable is set forth in the preferred and illustrated embodiment capable of transferring two or more data streams traveling along two or more optical fiber channels. The rotary joint is constructed with a stationary portion and a coacting rotary portion. A first channel of data is delivered to an optical fiber transmitted coaxially of the stationary and rotary sides of the apparatus, transfer across the rotational plane between the two components being accomplished by opposing centrally located, concentrically arranged, coacting optical lenses. A second data channel transmitted through a second optical fiber is delivered to a lens system which converts the light into a cylinder of light coaxial with the first channel and which surrounds the optical management for the first channel. All channels other than the first channel thus are converted into coaxial hollow cylinders of light. These cylinders of light are transmitted between facing lens systems in the rotary and stationary sides of the apparatus.
REFERENCES:
patent: 4304460 (1981-12-01), Tanaka et al.
patent: 4398791 (1983-08-01), Dorsey
patent: 4641915 (1987-02-01), Asakawa et al.
patent: 4725116 (1988-02-01), Spencer et al.
Gold Randy
Smith Darren E.
Beard William J.
Halliburton Logging Services Inc.
Lee John D.
Ngo John
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