| 摘要 |
<p>A device for determining the distance from a point on the surface of an object to a fixed point. Which device consists of a light source (1), and - positioned behind each other in the path of the light beam emitted by the light source - means (17) to limit the section of this beam, a ray splitter (6) and a microscope objective (7) to focus the beam onto a point (8) on the surface of the object (14) to be measured. Furthermore, means (18) to asymmetrically limit the section of the reflected beam and a position sensitive light detector are arranged behind each other in the path of the beam subsequently reflected by the road surface (14) of the object and the ray splitter (6). The means to limit the beam emanating from the light source also realizes an asymmetric limitation of said beam. The illuminating system in above device is based on the diffuse reflection at the surface of the object to be measured.</p> |
