| 摘要 |
Apparatus for position-detection of an object (3) within a region is disclosed. The apparatus comprises first and second target elements (15, 17) mounted on an object and having a known separation distance between the two. A scanning light source (6a, 8) is configured to issue a beam of light along a substantially one-dimensional scanning path (13) which illuminates a point that moves over the first and second target elements. A detection means (6b) is provided for light reflected from, or received by, the first and second target elements. A processing system (7) is configured to determine the position of the object within the region based on first and second points in the scanning path at which the detection means detects light returned from, or received by, the first and second target elements and the known separation distance between the two reflective elements. |
