Contact-free slip ring for survey instrumentation

Optical waveguides – With optical coupler – Movable coupler

Reexamination Certificate

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Details

C385S134000, C385S139000

Reexamination Certificate

active

11081976

ABSTRACT:
A contact free rotary transformer assembly can be used to transfer power and information between a stationary portion and a rotatable portion of a laser scanning device. The rotary transformer can consist of a pair of substantially parallel ferrite rings, each having disposed therein a coil for passing AC current. The assembly can use an optical fiber positioned near a rotational axis of the transformer to transfer optical information between the stationary and rotary portions. The optical fiber can include two portions connected by a rotational connection in order to allow the portions to rotate with respect to one another while maintaining the light path.

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A. Esser et al., “Contactless High Speed Signal Transmission Integrated in a Compact Rotatable Power Transformer,”The European Power Electronics Association(1993), pp. 409-414.
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