Nova Scotia Research Foundation Corp.

Her Majesty the Queen in Right of Canada, as Represented by the Minister

John B Oliver

Edward Arthur Smallhorn

William W Spencer

Manual override system for linear magnetically operated valve

Manual override system for rotary magnetically operated valve

The invention relates to a multiple pass optical rotary joint which can simultaneously transmit optical signals along two or more channels in either of two directions. The joint uses a rotor and a stator to each of which is connected a plurality of optical fibers. Within the joint reflecting mirrors are used to redirect off-axis optical signals onto the joint axis, with relative rotation occurring while the signals are on-axis. A rotating member for each channel has a mirror for reflecting the on-axis signal portion off-axis to a receptor fiber. Alignment between the rotating member and the receptor fiber, as well as drive for the rotating member, is provided by a pair of magnets of opposite polarity, one being secured to the rotating member and the other being secured to the rotor. The magnetic interaction ensures synchronous rotation of the rotor and the rotating member. Specific embodiments in which transmission losses can be minimized are also disclosed.

Multiple pass optical rotary joint

A laminar flow element for use in a cylindrical fluid flow passage for restricting the flow of fluid through that passage to a constant volume flow rate. The element comprises a body portion having a cylindrical peripheral surface of predetermined length and predetermined diameter, with the surface defining with the passage an annular, tubular fluid passageway. Locating portions are provided extending from the element for engagement with at least one surface in the cylindrical passage for maintaining the peripheral surface concentrically disposed within the cylindrical passage. The length and diameter of the element are dimensioned so that the flow is laminar under all operating conditions, and therefore the volume rate of flow of fluid through the passage is linearly proportional to the pressure drop along the annular passage.

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Dartmouth, Canada

John B Oliver