Method and apparatus for calibrating a non-contact gauging sensor with respect to an external coordinate system
US6285959A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1999 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Aug 20, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/66
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The photogrammetric measurement system is positioned at a vantage point to detect and calibrate its reference frame to the external reference frame demarcated by light-reflecting retroreflective target dot on a spherical target. A tetrahedron framework with the spherical target mounted on one of the vertices serves as a reference target that is placed in front of the non-contact sensor to be calibrated. The photogrammetric measurement system reads and calibrates the position of the retroreflective target dot (and thus the tetrahedron) while the structured light of the sensor is projected onto the framework of the reference target. The structured light intersects with and reflects from the reference target, providing the non-contact sensor with positional and orientation data. This data is correlated to map the coordinate system of the non-contact sensor to the coordinate system of the external reference frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.