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This thesis focuses on developing a new technique for measuring the geometry of aspheric refractive optics, which are valued in industry for their superior imaging characteristics. While established measuring techniques exist, none can optically measure geometry in transmission, which is preferable for refractive optics compared to the common reflection method. The research identifies the deflectometric technique “active reflection grating photogrammetry,” originally designed for specular objects, as a promising method. This technique enables the spatial determination of both incident and refracted light rays, although initial geometry measurement is hindered by ambiguities in the light path within the specimen. A model-based iterative approach allows for the determination of both surfaces using collected measurement data, with surface parameters adapted through an optimization process. Simulations suggest that an advanced technique utilizing multiple cameras could enhance measurement accuracy. However, experimental validation has faced challenges due to convergence issues stemming from measurement data deviations. To address this, the thesis investigates LCD monitors as optical components in the deflectometric system and develops a prediction method for stochastic phase deviations. Additionally, it discusses optimal geometrical configurations for error propagation and optimizes measurement software for phase evaluation and mo
Buchkauf
Deflektometrie in Transmission, Marc Fischer
- Sprache
- Erscheinungsdatum
- 2016
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