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http://dx.doi.org/10.3807/KJOP.2017.28.4.146

Measurement of Primary-mirror Vertex Coordinates for a Space Camera by Using a Computer-generated Hologram and a Theodolite  

Kang, Hye-Eun (Science of Measurement, University of Science and Technology)
Song, Jae-Bong (Center for Space Optics, Korea Research Institute of Standards and Science)
Yang, Ho-soon (Science of Measurement, University of Science and Technology)
Kihm, Hagyong (Science of Measurement, University of Science and Technology)
Publication Information
Korean Journal of Optics and Photonics / v.28, no.4, 2017 , pp. 146-152 More about this Journal
Abstract
Alignment of the mirrors composing a space telescope is an important process for obtaining high optical resolution and performance of the camera system. The alignment of mirrors using cube mirrors requires a relative coordinate mapping between the mirror and the cube mirror before optical-system integration. Therefore, to align the spacecraft camera mirrors, the relative coordinates of the vertex of each mirror and the corresponding cube mirror must be accurately measured. This paper proposes a new method for finding the vertex position of a primary mirror, by using an optical fiber and alignment segments of a computer-generated hologram (CGH). The measurement system is composed of an optical testing interferometer and a multimode optical fiber. We used two theodolites to measure the relative coordinates of the optical fiber located at the mirror vertex with respect to the cube mirror, and achieved a measurement precision of better than $25{\mu}m$.
Keywords
Computer generated hologram; Theodolite system; Space optics;
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