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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. |
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CITATIONS
Cited by 1 scholarly publication and 4 patents.
Aspheric lenses
Sensors
Distance measurement
Aspheric optics
Autocollimators
Spherical lenses
Metrology
