| 摘要 |
A method for measuring displacement of an object ( 20 ) having a flat surface ( 21 ), includes the following steps. When the object is in a first position (A), a first laser beam is emitted onto the flat surface at a first incident angle, the first laser beam thereby is reflected by the flat surface and incident onto a light sensitive transducer ( 30 ) at a first incident location ( 35 ) at a second incident angle. The object is then moved to a second position (B), second laser beam is emitted onto the flat surface at the first incident angle, the second laser is reflected by the flat surface and incident onto the light sensitive transducer at a second incident location ( 35 ') at the second incident angle. Lastly the displacement (D) of the object is calculated according to a distance (L) between the first and second incident location.
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