| 摘要 |
<p>Position measurement system (1) for determining 2D displacement or position of a mobile element with respect to a reference frame (20), comprising:
- a point light source (2) fixed on a reference frame (20);
- an optical mask (40), comprising transparent and opaque areas on at least one side of its surfaces, said areas defining a pattern comprising a regular pattern;
- an imager (50), fixed to a mobile element, comprising integrated electronic circuits allowing detection, computing and analyzing of a shadow projected by the optical mask (40),
and characterized in that the system (1) comprises an optical diffuser plate (30) positioned between said point light source (2) and the optical mask (40) and characterized in that the imager (50), the optical mask (40) and the optical diffuser plate (30) form an assembly (11) so as to produce a light spot (6) created by the scattering of the incident light beam (4) emitted by the point light source (2) on said optical diffuser plate (30), and characterized in that said optical mask (40), positioned in between said optical diffuser plate (30) and said imager (50), produces a shadow on said Imager (50), allowing to compute and provide 2D position of the mobile element relative to the fixed reference frame (20).</p> |
