Verification of the optical design by simultaneous measurement of centering errors and relative surface distances inside of optical systems

Patrik Langehanenberg; Daniel Stickler; Bernd Lüerß; Josef Heinisch

doi:10.1117/12.2014849

18 December 2012 Verification of the optical design by simultaneous measurement of centering errors and relative surface distances inside of optical systems

Patrik Langehanenberg, Daniel Stickler, Bernd Lüerß, Josef Heinisch

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Proceedings Volume 8550, Optical Systems Design 2012; 85500Y (2012) https://doi.org/10.1117/12.2014849
Event: SPIE Optical Systems Design, 2012, Barcelona, Spain

Abstract

Especially for optical compound systems the precise geometric alignment of every single element according to the optical design is essential to obtain the desired imaging properties. In this contribution we present a technology for the measurement of the complete set of geometric alignment parameters in assembled systems. During the measurement the deviation of each center or curvature with respect to a reference axis is measured. These data are further processed in order to provide the shift and tilt of every single lens or group of lenses with respect to a defined reference axis. The centering errors of up to 40 surfaces within a system under test can be measured with accuracies in the range of an arc second. In addition, the relative distances of the optical surfaces (center thicknesses of lens elements, air spacing in between) are optically determined in the same measurement system by means of low-coherent interferometry. The measured results can be used for tolerance testing of the sample with respect to the given optical design. In addition, the obtained information can also be applied for the direct compensation of geometrical alignment errors of every single lens in the assembly for the optimized assembly of high-precision optics.

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Patrik Langehanenberg, Daniel Stickler, Bernd Lüerß, and Josef Heinisch "Verification of the optical design by simultaneous measurement of centering errors and relative surface distances inside of optical systems", Proc. SPIE 8550, Optical Systems Design 2012, 85500Y (18 December 2012); https://doi.org/10.1117/12.2014849

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KEYWORDS

Optical design

Autocollimators

Assembly tolerances

Optical components

Geometrical optics

Optical alignment

Optical fabrication

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