| 摘要 |
A system is configured to determine the displacement of a moveable member relative to a reference member. A set of sensors is fixed relative to one of the reference member and moveable member. An array of encoded words is provided. The encoded words define each position of the moveable member along a first direction. Each encoded word includes a plurality of indicia and each indicia is a multi-level logic unit configured as one of at least two states. The position of the encoded words relative to the set of sensors defines a position of the movable member along a second direction.
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