Quality control of the CFRP mirror manufacturing process at NPF

N. Soto; C. Lobos; P. Mardones; A. Bayo; C. Rozas; S. Castillo; G. Hamilton; L. Pedrero; S. Zúñiga-Fernández; K. Maucó; H. Hakobyan; C. García; M. R. Schreiber; W. Brooks

doi:10.1117/12.2559755

13 December 2020 Quality control of the CFRP mirror manufacturing process at NPF

N. Soto, C. Lobos, P. Mardones, A. Bayo, C. Rozas, S. Castillo, G. Hamilton, L. Pedrero, S. Zúñiga-Fernández, K. Maucó, H. Hakobyan, C. García, M. R. Schreiber, W. Brooks

Author Affiliations +

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114512I (2020) https://doi.org/10.1117/12.2559755
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The surface quality of replicated CFRP mirrors is ideally expected to be as good as the mandrel from which they are manufactured. In practice, a number of factors produce surface imperfections in the final mirrors at different scales. To understand where this errors come from, and develop improvements to the manufacturing process accordingly, a wide range of metrology techniques and quality control methods must be adopted. Mechanical and optical instruments are employed to characterise glass mandrels and CFRP replicas at different spatial frequency ranges. Modal analysis is used to identify large scale aberrations, complemented with a spectral analysis at medium and small scales. It is seen that astigmatism is the dominant aberration in the CFRP replicas. On the medium and small scales, we have observed that fiber print-through and surface roughness can be improved significantly by an extra resin layer over the replica's surface, but still some residual irregularities are present.

Conference Presentation

Citation Download Citation

N. Soto, C. Lobos, P. Mardones, A. Bayo, C. Rozas, S. Castillo, G. Hamilton, L. Pedrero, S. Zúñiga-Fernández, K. Maucó, H. Hakobyan, C. García, M. R. Schreiber, and W. Brooks "Quality control of the CFRP mirror manufacturing process at NPF", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114512I (13 December 2020); https://doi.org/10.1117/12.2559755

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