The correct lens mount lightweighting design of thermal cycle stress in Cassegrain telescope

Hsu, M. Y.; Chang, Shenq-Tsong; Huang, Ting; Hsu, Ming-Ying

doi:10.1117/12.892064

Cited by 2 publications

(1 citation statement)

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“…Optical elements of a multi-mirror telescope (MMT) are mounted and attached to invar cells. The corrector cell supports particularly important telescope elements with minimal distortion at various gravitational loads and in a wide temperature range (from -15 ° C to 25 ° C), due to the microhardness and low CLTE of invar [5].…”

Section: Analytical Reviewmentioning

confidence: 99%

Study of Mechanical Properties of Fe-ni-co Alloy With Alloying Elements Used in Space Telescopes.

Kaparov

2023

Preprint

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One of the main purposes of modern metallurgy is to improve the properties of existing materials and develop fundamentally new materials. Improving the efficiency of space telescope constructions is always an urgent task for the space industry. Reducing weight, maintaining ductility and improving operational performances are the aims that materials scientists will always face. Invar Fe-Ni-Co alloy is widely used in many industries requiring high dimensional stability such as metrology, high precision instrumentation, and optical assembly in the space industry. Hypothesis: the addition of certain chemical elements will improve the mechanical properties and expand the scope of the developed alloy. In this work, the following purpose is set: to investigate the operational properties of the Fe-Ni-Co alloy with alloying elements used in high-precision technologies. In this work, experiments for microhardness, a research on microstructure, determination of the Coefficient of Linear Thermal Expansion (CLTE) were carried out. In the course of the work, Fe-Ni-Co was smelted with the addition of alloying elements in the form of Cr, Mn. In the initial state, the microhardness of the alloy was Нμ = 6433 MPa. The highest microhardness index was achieved after annealing at 7000C (5 hours) Нμ = 9393 MPa, which is 46% higher than the initial one. Novelty of work: We have developed a new alloy with improved mechanical properties, which can replace invar, and subsequently contribute to a sharp push in the sphere of astronomy. Results of exploration: We recommend using the results of this work in the manufacture of parts for space telescopes that require resistance to thermal vibrations and aggressive surroundings. The CLTE measurements of the alloys were carried out at room temperature under standard conditions. At 2000C, the sample expanded by 0.006 mm, which corresponds to an CLTE of α=1.8×10-6К-1.

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Section: Analytical Reviewmentioning

confidence: 99%

Study of Mechanical Properties of Fe-ni-co Alloy With Alloying Elements Used in Space Telescopes.

Kaparov

2023

Preprint

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The correct lens mount lightweighting design and thermal stress OPD analysis in Cassegrain telescope

Hsu¹,

Chan²,

Lin³

et al. 2013

Optomechanical Engineering 2013

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This study is trying to evaluate different lens barrel material, caused lens stress OPD (Optical Path Different) in different temperature condition. The Cassegrain telescope's correct lens assembly are including as correct lens, lens mount, spacer, mount barrel and retainer. The lens barrel initial design is made by invar, but system mass limit is need to lightweighting to meet requirement. Therefore, the lens barrel material is tried to replace to lower density material, such as aluminum and titanium alloy. Meanwhile, the aluminum or titanium alloy material properties CTE (Coefficient of Thermal Expansion) are larger then invar. Thus, the high CTE material will introduce larger thermal stress into the optical system in different temperature condition. This article is analysis the correct lens assembly thermal stress and optical performance in different lens mount material. From above conditions, using FEM (Finite Element Method) and optical software, simulation and optimization the lens mount to achieve system mass requirement.

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The correct lens mount lightweighting design of thermal cycle stress in Cassegrain telescope

Cited by 2 publications

References 0 publications

Study of Mechanical Properties of Fe-ni-co Alloy With Alloying Elements Used in Space Telescopes.

Study of Mechanical Properties of Fe-ni-co Alloy With Alloying Elements Used in Space Telescopes.

The correct lens mount lightweighting design and thermal stress OPD analysis in Cassegrain telescope

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