Fleischmann, FriedrichFriedrichFleischmannBinkele, TobiasTobiasBinkeleHilbig, DavidDavidHilbig2025-11-142025-11-142025-08https://media.suub.uni-bremen.de/handle/elib/23294Optical elements with freeform surfaces open new degrees of freedom in the design of optical systems. Reliable measurement of shape is challenging, especially in case of strongly curved ones. A realization of deflectometry, Experimental Ray Tracing (ERT), has proven to measure those surfaces with high accuracy. A crucial step is integration of measured gradients from sampled and noisy data. A model based method for surface reconstruction based on Radial Basis Functions (RBF) using non-linear optimization is presented and discussed. Measurement of freeforms and results are presented and discussed.en600 Technik, Medizin, angewandte Wissenschaften::600 TechnikText::Konferenzveröffentlichung::Konferenzpräsentation10.1117/12.3062466