C6.2 - Calibration Concept for Dimensional Measurements with Optical Multiscale Multi-Sensor Systems
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings SENSOR 2015
- C6 - Geometrial Measurements
- A. Loderer, W. Hartmann, T. Hausotte - Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen (Germany)
- 447 - 452
This article describes a new calibration concept for dimensional measurements of optical measuring systems. Using the example of a prototypical multiscale multi-sensor fringe projection system for production-related inspections of sheet-bulk metal formed parts, current measuring procedures of the optical system are introduced. Out of the shown procedures’ deficits a new concept is developed for determining the orientations and positions of the sensors’ measuring ranges in a common coordinate system. Principle element of the concept is a flexible calibration artefact, adapted on the measuring task of the fringe projection system. By measuring the calibration artefact with each fringe projection sensor and aligning the resulting datasets on a digital reference model of the artefact, sensor specific transformation matrices can be calculated which allow transforming the sensors’ datasets into a common coordinate system. Thus geometrical relation between individual measured features can be determined and dimensional measuring beyond the measuring range of a sensor became possible. Due to series of experiments the advantages of the new calibration concept in comparison with the current measuring procedures are finally revealed.