GPU-based raytracing for accelerating deflectometric asphere measurements
Institut für Produktionsmesstechnik, Technische Universität Braunschweig, Schleinitzstraße 20, 38106 Braunschweig, Germany
* Corresponding author: firstname.lastname@example.org
Deflectometry in transmission offers the ability to measure simultaneously the front and back surface geometries of transparent test specimen, while keeping their geometric relation. The acquired data consist of measured rays between a pattern generator and an image sensor. To obtain the 3-dimensinal geometry from the measurement data, a model-based evaluation method is used, which iteratively determines the lens parameters. For each iteration step, hundreds of thousands of light rays have to be traced through the model. This results in a calculation time in the dimension of one hour, which prevents the competitiveness of this measuring approach. In order to optimize the computation time parallelizing the raytracing calculations on graphics hardware seems promising. To achieve this task, NVIDIA OptiX, a high level raytracing API, is used to develop a ray tracer.
© The Authors, published by EDP Sciences, 2017
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