SPOT series camera improvement for the HRG: very high resolution instrument of SPOT 5

Gueguen, Frederic; Bettes, A.; Toulemont, Y.; Costeraste, J.; Rosak, A.

doi:10.1117/12.360020

Cited by 3 publications

(1 citation statement)

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“…With lots of merits such as no chromatic aberration, no central obscuration and multiple variables can be optimized; Off-axis three-mirror anastigmat (TMA) optical system gets more and more applications. [1][2][3] However, due to space telescope uses off-axis reflective optical system, its opto-mechanical structure has non-axisymmetry characteristics, the more stringent requirements such as support structure form and thermal dimensional stability were put forward. Especially, large aperture rectangular mirror and its support structural design are the most difficult and key technology in off-axis TMA space telescope research and development.…”

Section: Introductionmentioning

confidence: 99%

Structural Design of Large Aperture Rectangular Mirror for Space Telescope

2012

AMM

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Structural design of large aperture mirror is one of the key technologies for space telescope development. To meet the requirements of high stiffness, strength and thermal dimensional stability, some factors such as support scheme, materials selection, lightweight design and flexible support design were taken into account. The three supports location of the mirror was determined according to the modal analytical solution. By adjusting the parameters of flexure hinge, influences of gravity, assembly stress and thermal stress on the mirror were reduced obviously. Finite element analysis (FEA) results indicate that the surface accuracy reach to rms10.2nm and 10.8nm under the gravity along optical axis direction and 5°C uniform temperature rise respectively, the fundamental frequency of the mirror component is 268Hz. Dynamics test shows that the first order natural frequency is 256Hz, which shows an error less than 5% compared to FEA results.

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Section: Introductionmentioning

confidence: 99%