Method and apparatus for ascertaining the absolute coordinates of an object
US5289264A · kind A · utility
Inventor
Key dates
| Filing date | Sep 25, 1992 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Sep 25, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/254
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus is used for ascertaining the absolute coordinates of an object (1). Said apparatus includes a light source (6), projection optics, in particular a projection objective (7), a projection grating (2) which is projected onto the object (1) through the projection optics (7) to form an image, a sensor (5) for receiving the light (4) reflected from the object (1), and an objective (8) projecting the light (4) reflected from the object (1) onto the sensor (5). In order to enable the simple determination of the absolute coordinates of the object (1), the projection grating (2) and/or the sensor (5) are rotatable. There is provided an evaluation unit which evaluates the signals (shots or pictures) of the sensor (5) at least two different angle positions of the projection grating (2) or of the sensor (5) and determines the absolute coordinates of the object (1) therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.