From Event: SPIE Optical Engineering + Applications, 2016
A single aspheric or freeform lens contains the elements front and backside surface, edges and maybe other reference surfaces or structures. In this paper is demonstrated how a high precision form tester is capable of measuring these elements utilizing an optical and a tactile probe system. The measurements can be used to determine the orientation or alignment of the different surfaces and structures. Different measuring examples are presented and the influence of the measuring uncertainty from the instrument and the measuring strategy are shown. This information may be useful for tolerancing of lenses and an optimization of the production process.
Andreas Beutler, "Measurement of the alignment of the surfaces and the edges of aspheric lenses," Proc. SPIE 9951, Optical System Alignment, Tolerancing, and Verification X, 99510K (Presented at SPIE Optical Engineering + Applications: August 28, 2016; Published: 27 September 2016); https://doi.org/10.1117/12.2237614.
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