Plessey Incorporated

David A Kahn

John P Dakin

A position indicating system for affording an indication of the instantaneous position of a movable member, such as a rotating shaft, comprises means for producing light in different color bands directed on to a suitably coded structure movable in accordance with movement of the movable member or coded structure which itself carried filter means for separating light into different colors. Optical fibre means is located for receiving colored light passing through the movable coded structure and for transmitting light to light detector means for producing an output dependent upon the light received by the optical fibre means and indicative of the instantaneous position of the movable member.

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Bittern, United Kingdom

David A Kahn