Coordinate mapping of the primary mirror vertex in a space telescope by using a CGH and theodolites

H. Kihm; H.-S. Yang; J.-W. Kang

doi:10.1117/12.2525915

21 June 2019 Coordinate mapping of the primary mirror vertex in a space telescope by using a CGH and theodolites

H. Kihm, H.-S. Yang, J.-W. Kang

Proceedings Volume 11056, Optical Measurement Systems for Industrial Inspection XI; 1105642 (2019) https://doi.org/10.1117/12.2525915
Event: SPIE Optical Metrology, 2019, Munich, Germany

Abstract

Optical alignment of the mirror components in a space telescope is an important process for obtaining high optical resolution and performance of the camera system. The alignment of mirrors depends on the external coordinate frame using a cube mirror, and a relative coordinate mapping between the mirror and the cube mirror before optical system integration is a prerequisite step. Therefore, in order 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 the computer-generated hologram (CGH). The measurement system is composed of an optical testing interferometer, a multimode optical fiber. We used 2 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 less than 25um.

Citation Download Citation

H. Kihm, H.-S. Yang, and J.-W. Kang "Coordinate mapping of the primary mirror vertex in a space telescope by using a CGH and theodolites", Proc. SPIE 11056, Optical Measurement Systems for Industrial Inspection XI, 1105642 (21 June 2019); https://doi.org/10.1117/12.2525915

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