Flat surface measurement using laser trackers and SMRs on motorized stages

Dongok Ryu; Jongguk Choe; Youngchun Youk; Goeun Kim; EungShik Lee

doi:10.1117/12.2676761

4 October 2023 Flat surface measurement using laser trackers and SMRs on motorized stages

Dongok Ryu, Jongguk Choe, Youngchun Youk, Goeun Kim, EungShik Lee

Author Affiliations +

Proceedings Volume 12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV; 126770N (2023) https://doi.org/10.1117/12.2676761
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Conference Poster

Abstract

In this paper, we propose a noncontact, high-precision method for measuring the flat surface of large-scale optics using laser trackers and spherically mounted reflectors (SMRs) placed on motorized stages. Accurate measurement of surface flatness is critical for the development of optical systems, especially for aligning large-scale astronomical telescopes and space-based instruments. The proposed method can capture high-resolution surface figure of large flat areas, generating dense spatial point clouds. The measurement system consists of laser trackers, SMRs on two-dimensional motorized stages, and a flat mirror. The laser tracker directly measures the position of an SMR and captures an image of the SMR through the reflection from a flat mirror. The motorized stage enables precise and repeatable movement of the optics, allowing for the measurement of the local slope and complete surface figure of the flat mirror. To demonstrate the effectiveness of the proposed method, we conducted a series of measurements using a large flat mirror. The results show that the proposed method can measure the surface figure of a flat mirror with six-degrees-of-freedom, accuracy, and precision. The measurement data obtained from the laser tracker and SMR were compared with those obtained using an interferometer-based measurement system with a parabolic mirror, and the results were found to be in excellent agreement. The proposed method offers a noncontact, high-precision solution for measuring the surface figure of large flat areas and has the potential to significantly improve the manufacturing and testing of large optical systems for astronomy and space-based applications.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Dongok Ryu, Jongguk Choe, Youngchun Youk, Goeun Kim, and EungShik Lee "Flat surface measurement using laser trackers and SMRs on motorized stages", Proc. SPIE 12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV, 126770N (4 October 2023); https://doi.org/10.1117/12.2676761

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