Multi-channel, off-axis, bi-directional fiber optic slipring

Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means

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25022711, 350 9620, 350 9625, G02B 632

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active

049431374

ABSTRACT:
An optical slipring includes a derotating, transmissive intermediate optical component with an array of lensed optical transmitters and receivers respectively mounted on the rotor and stator. The lensed transmitters receive light from optical fibers, or other light source, and expand the light into a collimated light beam for transmission across the rotor/stator gaps. The lensed receivers receive the expanded, collimated light beams and focus them onto a receiving fiber or photodetector. To make the slipring bi-directional, each lens functions as both a converging and diverging lens and thus as a receiver and transmitter. Collimated light beams minimize light loss caused by the inability to efficiently couple diverging light beams. The expanded light beams enable the illumination of many of the small diameter optical fibers on the entrance face of the intermediate optical component and thus minimize the effect of individual broken fibers, the presence of debris, separation distances, component tolerances, or backlash in the gearing. The derotating, intermediate optical component comprises an image conduit, image transporter, or coherent optical fiber bundle of close-packed monofibers or multifibers which is capable of efficiently collecting and transmitting the collimated light beams because of its small numerical aperture, close packing, low bend losses and crosstalk, and minimal signal and wavelength dispersion. The intermediate optical component maintains optical continuity between the lensed transmitters and receivers of each channel with rotation of the slipring because of the two-fold symmetry of the entrance and exit faces of the optical fibers necessary for derotation and moves at half the angular velocity of the slipring.

REFERENCES:
patent: 4027945 (1977-06-01), Iverson
patent: 4109997 (1978-08-01), Iverson
patent: 4109998 (1978-08-01), Iverson
patent: 4258897 (1981-03-01), Scott et al.
patent: 4398791 (1983-08-01), Dorsey
patent: 4447114 (1984-05-01), Koene
patent: 4460242 (1984-07-01), Birch et al.
patent: 4519670 (1985-05-01), Spinner et al.
Es'Kov et al., "Construction Principles of Fiber-Optic Compensators," Soviet J. Opt. Technol., vol. 48, No. 12, Dec. 1981, pp. 709-711.

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