Mehrwellenlängen-Verfahren zur strukturierten Beleuchtung

authored by

Marcus Petz, Paul Felix Hagen, Rainer Tutsch

Abstract

Optical measuring methods based on the principle of structured illumination frequently apply phase shift evaluation for optical spatial coding. While these approaches allow for efficient and high-precision coding in many applications, they reach their limits in particular when different signal components are superimposed. This kind of signal superimpositions occur in stripe projection, for example due to multiple reflections on the workpiece surface, or in deflectometric methods due to the superimposition of front and rear side reflections on transparent samples. Against the background of this problem, a new approach in the field of structured illumination is presented in this article, which - based on comparable approaches from the field of absolute measuring interferometry - implements a spatial coding by a pattern sequence with increasing spatial frequency. In addition to the basics of the method, first experimental results are presented, which show that the method enables a high level of accuracy and that the separation of superimposed signals succeeds with high quality.

Organisation(s)

Institute of Measurement and Control Engineering

External Organisation(s)

Technische Universität Braunschweig

Type

Conference contribution

Pages

1-13

No. of pages

13

Publication date

2022

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Computer Vision and Pattern Recognition