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16 October 2017 Automated asphere centration testing with AspheroCheck UP
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Proceedings Volume 10448, Optifab 2017; 104481H (2017)
Event: SPIE Optifab, 2017, Rochester, New York, United States
With aspheres being incorporated in optical designs across all industry fields, there is high demand for fast and flexible metrology solutions for aspheric lenses. While many systems support measuring the surface topography, the process is limited to a specific design or based on a time-consuming scanning process. Centration measurement with such systems requires additional probes or the inclusion of external reference surfaces in the measurement process.

In this paper, we present AspheroCheck UP [1], a highly automated lens testing system based on the well-established AspheroCheck principle. The paraxial centering errors of both optical surfaces are measured in reflection using a focusing autocollimator. This centration measurement is combined with a fully motorized, non-contact distance sensor that measures the aspheric surface run-out. All three measurements can be performed in parallel during a single rotation of the sample, greatly reducing overall measurement time. The sensor can also be used for referencing to outer diameter, flange and/or interlock surfaces and even double-aspheric lenses. A five-axis motorized table enables the automatic alignment of the optical axis of the sample to the rotation axis. This significantly reduces setup time and allows for fully automatic testing without user interaction, ensuring both high measurement accuracy and high repeatability independent of the operator.

A full cycle time of less than 1 minute including loading and unloading is possible, enabling applications in both R&D and production environments. In addition to supporting ISO and Q-type polynomial surfaces, the system supports most other rotationally symmetric surface types, including Fresnel and diffractive surfaces.
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
F. Hahne and P. Langehanenberg "Automated asphere centration testing with AspheroCheck UP", Proc. SPIE 10448, Optifab 2017, 104481H (16 October 2017);

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