Precision High Strain Composite Hinges for the Deployable In-Space Coherent Imaging Telescope

Silver, Mark; Echter, Michael A.; Reid, Brendan N.; Banik, Jeremy

doi:10.2514/6.2016-0969

Cited by 7 publications

(7 citation statements)

References 6 publications

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“…To do this, an Invar reference specimen that was a form and fit replacement for the hinge specimens was fabricated then installed and measured in the test apparatus. More details about these measurements are described in Silver et al 17 The results showed that the changes in the position measurement of the test apparatus to the range of temperature and humidity changes expected during the tests were approximately 50 nm or less.…”

Section: Test Instrumentationmentioning

confidence: 99%

Recent Developments in Precision High Strain Composite Hinges for Deployable Space Telescopes

Echter

Silver

D'Elia

et al. 2018

2018 AIAA Spacecraft Structures Conference

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Future large space-based telescopes will require precision mechanisms for deployment or alignment after they reach orbit. This research effort seeks to develop deployable primary-mirror telescope technologies that leverage recent advances in mirror phasing, actuation and deployable structure technologies. One way to obtain a precise deployed position of the optical components is with structures incorporating precision High-Strain Composite (HSC) hinges. This paper focuses on characterizing the deployment precision of individual HSC hinges and of a support frame utilizing multiple HSC hinges. Measurements of certain individual HSC hinges demonstrate position precision as low as 0.6 µm and angular precision as low as 6 µrad. A deployable frame concept produced axial precision of 0.2 µm, piston precision of 2.3 µm and angular precision of 6.3 µrad. A few modifications to the frame test setup are proposed that may improve the piston precision results.

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Section: Test Instrumentationmentioning

confidence: 99%

Recent Developments in Precision High Strain Composite Hinges for Deployable Space Telescopes

Echter

Silver

D'Elia

et al. 2018

2018 AIAA Spacecraft Structures Conference

Self Cite

View full text Add to dashboard Cite

show abstract

“…The researchers intend to reduce the complexity of deployment mechanisms, which can meet optical precision requirements, compared to the complicated deployment mechanism of the JWST. 107 The baseline optical design is not thoroughly described in the literature available on this project. The objective is a 0.7-m effective sparse aperture Cassegrain telescope.…”

Section: Deployable In-space Coherent Imaging Telescopementioning

confidence: 99%

“…The objective is a 0.7-m effective sparse aperture Cassegrain telescope. 107 The expected performance of such a system or its operational environment are not clarified either. Some renders related to this project can be found online showing a multimirror arrangement with nondeployable secondary mirror and a deployable, segmented primary.…”

Section: Deployable In-space Coherent Imaging Telescopementioning

confidence: 99%

Review on thermal and mechanical challenges in the development of deployable space optics

Villalba

Kuiper

Gill

2020

J. Astron. Telesc. Instrum. Syst.

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Deployable optics promise a revolution in the capability of observing the universe by delivering drastically reduced mass and volume needs for a desired level of performance compared to their conventional counterparts. However, this places new demands on the mechanical and thermal designs of new telescopes, essentially trading mass and volume for structural and control complexity. We compile the thermomechanical challenges that should be taken into consideration when designing optical space systems, as well as summarize 14 projects proposed to address them. Stringent deployment repeatability requirements demand low hysteresis, whereas stability requirements require high stiffness, proper thermal management, and active optics.

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“…The HSC hinges presented in this work are sized for a Cube-Sat form factor, with a 0.7 m deployable sparsely filled primary mirror array. A schematic of the baseline sparseaperture design for the Deployable In-Space Coherent Imaging Telescope (DISCIT) [6,8,9] is shown in figure 1(a). The primary mirror segments will be deployed and coarsely positioned using HSC hinges with micrometer-level repeatability, as shown in figures 1(b) & 1(c) in the deployed and stowed states respectively.…”

Section: Multifunctional High Strain Composite Hinge: Designmentioning

confidence: 99%

“…Domber et al first demonstrated dimensional repeatability of a HSC hinge with 9 µm piston and 2.5 µm axial deployment repeatability, laying the foundation for the use of HSCs for deployable in-space optical systems [5]. Recent developments at MIT Lincoln Laboratory have improved upon this demonstrating HSC hinge deployment repeatability below 1 µm for piston and axial motions, and less than 8 µrad for pitch and roll motions [6,7].…”

Section: Introductionmentioning

confidence: 99%

A multifunctional high strain composite (HSC) hinge for deployable in-space optomechanics

Echter¹,

Gillmer²,

Silver³

et al. 2020

Smart Mater. Struct.

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Deployable, large aperture space optics require precision phasing of segmented and uniquesparsely-filled primaries for optical alignment which introduce challenges to these already complex optomechanical designs. This work presents a multifunctional high strain composite hinge with integrated piezoelectric actuation capabilities to support deployable space telescopes and address these challenges. Finite element simulations and experimental testing are utilized to design and validate the multifunctional high strain composite hinge. Macro Fiber Composite actuators are integrated with the high strain composite hinge in a specific layout based on the finite element analyses to induce piston, pitch, and roll tip motions for precision optical alignment after deployment. A feedback control system is implemented to demonstrate an actuation resolution of better than 25 nm over a 15 µm range for a single degree of freedom, validating the multifunctional high strain composite hinge for alignment to levels required for visible wavelength optical systems.

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Precision High Strain Composite Hinges for the Deployable In-Space Coherent Imaging Telescope

Cited by 7 publications

References 6 publications

Recent Developments in Precision High Strain Composite Hinges for Deployable Space Telescopes

Recent Developments in Precision High Strain Composite Hinges for Deployable Space Telescopes

Review on thermal and mechanical challenges in the development of deployable space optics

A multifunctional high strain composite (HSC) hinge for deployable in-space optomechanics

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