Cryogenic optical measurements of 12-segment-bonded carbon-fiber-reinforced silicon carbide composite mirror with support mechanism

Kaneda, Hidehiro; Onaka, Takashi; Enya, Keigo; Makiuti, S.; Takaki, Junji; Haruna, Masaki; Kume, Masami; Ozaki, Tsuyoshi

doi:10.1364/ao.47.001122

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…Yukari Y. YUI (1) , Ken GOTO (2) , Hidehiro KANEDA (2) , Haruyoshi KATAYAMA (1) , Masaki KOTANI (3) , Masashi MIYAMOTO (1) , Masataka NAITOH (1) , Takao NAKAGAWA (2) , Hideki SARUWATARI (1) , Masahiro SUGANUMA (1) , Hiroyuki SUGITA (1) , Yoshio TANGE (1) , Shin UTSUNOMIYA (1) , Yasuji YAMAMOTO (1) , Toshihiko YAMAWAKI (1) (1) Japan Aerospace Exploration Agency, Tsukuba,Ibaraki,Japan yui.yukari@jaxa.jp,katayama.haruyoshi@jaxa.jp,miyamoto.masashi@jaxa.jp,naitoh.masataka@jaxa.jp,saruwatari.hideki@jaxa.jp,suganuma.masahiro@jaxa.jp,sugita.hiroyuki@jaxa.jp,tange.yoshio@jaxa.jp,utsunomiya.shin@jaxa.jp,yamamoto.yasuji@jaxa.jp,yamawaki.toshihiko@jaxa.jp (2) Japan Aerospace Exploration Agency,Sagamihara,Kanagawa,Japan goto.ken@jaxa.jp,kaneda.hidehiro@jaxa.jp,nakagawa.takao@jaxa.jp (3) Japan Aerospace Exploration Agency,Mitaka,Tokyo,Japan kotani.masaki@jaxa.jp…”

Section: Performance Of Lightweight Large C/sic Mirrormentioning

confidence: 99%

“…For the purposes of verifying the designing and manufacturing technologies of lightweight large silicon carbide mirror and employing it as a test mirror used for ground optical The final goals of our study are as follows; (1) verifying and confirming the manufacturing process of lightweight large silicon carbide mirror, from designing of structure and mixing of raw material to final polishing, (2) developing the methods to evaluate and guarantee the ceramic mirror quality for space use, (3) achieving matured designing technique of thermally stable mirror and optical system and evaluation of its thermal stability, and (4) achieving and establishing highly precise ground optical testing technology for large mirrors and large telescope systems.…”

Section: Introductionmentioning

confidence: 99%

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Performance of lightweight large C/SiC mirror

Yui

Goto

Kaneda

et al. 2017

International Conference on Space Optics — ICSO 2008

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Very lightweight mirror will be required in the near future for both astronomical and earth science/observation missions.Silicon carbide is becoming one of the major materials applied especially to large and/or light space-borne optics, such as Herschel, GAIA, and SPICA. On the other hand, the technology of highly accurate optical measurement of large telescopes, especially in visible wavelength or cryogenic circumstances is also indispensable to realize such space-borne telescopes and hence the successful missions.We have manufactured a very lightweight =800mm mirror made of carbon reinforced silicon carbide composite that can be used to evaluate the homogeneity of the mirror substrate and to master and establish the ground testing method and techniques by assembling it as the primary mirror into an optical system. All other parts of the optics model are also made of the same material as the primary mirror.The composite material was assumed to be homogeneous from the mechanical tests of samples cut out from the various areas of the 800mm mirror green-body and the cryogenic optical measurement of the mirror surface deformation of a 160mm sample mirror that is also made from the same green-body as the 800mm mirror.The circumstance and condition of the optical testing facility has been confirmed to be capable for the highly precise optical measurements of large optical systems of horizontal light axis configuration.Stitching measurement method and the algorithm for analysis of the measurement is also under study.

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Section: Performance Of Lightweight Large C/sic Mirrormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of lightweight large C/SiC mirror

Yui

Goto

Kaneda

et al. 2017

International Conference on Space Optics — ICSO 2008

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“…Following the successful development of the AKARI SiC mirrors, we started programs to develop new SiC-based mirror materials, including reaction-sintered SiC 16 , carbon-fiber-reinforced plastic (CFRP), and carbon-fiber-reinforced SiC composite (C-SiC) 17 for the next-generation infrared mission and other space applications. The last material, C/SiC, in particular, has potential to improve the fragility of SiC inherited from its ceramic nature and increase a freedom of the mirror support design 17 .…”

Section: Development Of Mirror Materials For Future Missionsmentioning

confidence: 99%

“…The last material, C/SiC, in particular, has potential to improve the fragility of SiC inherited from its ceramic nature and increase a freedom of the mirror support design 17 . The composite nature, on the other hand, requires special care in the polishing process.…”

Section: Development Of Mirror Materials For Future Missionsmentioning

confidence: 99%

Cryogenic silicon carbide mirrors for infrared astronomical telescopes: lessons learnt from AKARI for SPICA

et al. 2013

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Silicon carbide (SiC) has good thermal conductivity, high stiffness, and a relatively low specific density, all of which are advantageous to the application to telescopes operating at cryogenic temperatures. The first Japanese astronomical infrared space mission AKARI, which was launched in 2006 February and completed the second generation all-sky survey at 6 bands from mid-to far-infrared, employed a 700mm cryogenic telescope made of specially developed SiC. It was a sandwich-type of SiC composed of a lightweight porous core and a dense chemical vapor deposition (CVD) coat to decrease the specific density and facilitate machining for achieving the required surface figure accuracy. Measurements with an interferometer of 160-mm sample mirrors demonstrated that the AKARI mirror SiC had good thermal stability down to cryogenic temperatures (~6K), while the mirror support of the compact design became the primary source of the wave-front errors of the AKARI telescope. Taking the advantage of the heritage of the AKARI telescope development as well as ESA's Herschel telescope, we are planning the next infrared space mission SPICA (Space Infrared Telescope for Cosmology and Astrophysics) of a 3.2m cooled telescope in participation of ESA using SiC-based materials. In this presentation, we summarize the development of AKARI SiC telescope and present the development activities of the SPICA telescope from the point of view of SiC being as the mirror material for cryogenic space infrared telescopes.

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“…Recent work by ECM in Germany, and Mitsubishi Electric Corporation (MELCO) in Japan [6,7,8] (see also [9]) has led to the development of HB-Cesic®, "hybrid" C/SiC. "Hybrid" indicates that a mixture of different types of chopped, short carbon-fiber is used.…”

Section: Introductionmentioning

confidence: 99%

High-precision CTE measurement of hybrid C/SiC composite for cryogenic space telescopes

et al. 2012

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This paper presents highly precise measurements of thermal expansion of a "hybrid" carbon-fiber reinforced silicon carbide composite, HB-Cesic®a trademark of ECM, in the temperature region of ~310 10K. Whilst C/SiC composites have been considered to be promising for the mirrors and other structures of space-borne cryogenic telescopes, the anisotropic thermal expansion has been a potential disadvantage of this material. HB-Cesic® is a newly developed composite using a mixture of different types of chopped, short carbon-fiber, in which one of the important aims of the development was to reduce the anisotropy. The measurements indicate that the anisotropy was much reduced down to 4% as a result of hybridization. The thermal expansion data obtained are presented as functions of temperature using eighth-order polynomials separately for the horizontal (XY-) and vertical (Z-) directions of the fabrication process. The average CTEs and their dispersion in the range 293 10K derived from the data for the XY-and Z-directions were and , respectively. The absolute accuracy and the reproducibility of the present measurements are suggested to be better than and , respectively. The residual anisotropy of the thermal expansion was consistent with our previous speculation regarding carbon-fiber, in which the residual anisotropy tended to lie mainly in the horizontal plane.

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Cryogenic optical measurements of 12-segment-bonded carbon-fiber-reinforced silicon carbide composite mirror with support mechanism

Cited by 7 publications

References 12 publications

Performance of lightweight large C/SiC mirror

Performance of lightweight large C/SiC mirror

Cryogenic silicon carbide mirrors for infrared astronomical telescopes: lessons learnt from AKARI for SPICA

High-precision CTE measurement of hybrid C/SiC composite for cryogenic space telescopes

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