Eyeglass: a very large aperture diffractive space telescope

Hyde, Roderick A.; Dixit, S. N.; Weisberg, Andrew H.; Rushford, M. C.

doi:10.1117/12.460420

Cited by 42 publications

(27 citation statements)

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“…A 25-100 m aperture diffractive lens is to be deployed on orbit. 5,6 Two proposed missions that intend to generate large kilometer size baselines are the NASA Goddard Stellar Imager 7 and the NASA JPL study on the proposed Terrestrial Planet Finder (TPF). 8 Both of these concepts utilize a formation of free-flying spacecraft.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Feasibility Study of a Tethered Coulomb Structure

Seubert

Panosian

Schaub

2010

AIAA/AAS Astrodynamics Specialist Conference

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The Tethered Coulomb Structure (TCS) is a novel approach to generating a large deployable space structure. This concept uses electrostatic forces to repel a three-dimensional formation of spacecraft nodes interconnected through fine, lowmass tethers. This generates a near-rigid system that can be launched in a compact configuration and change its shape and size while on-orbit. The complex coupling between the close relative motion with electrostatics and tether dynamics is investigated. The TCS rotational stiffness characteristics are quantified through analysis of the TCS node attitudes. With a two-node configuration the rejection of angular rotation disturbances up to 50 deg/min are computed. The maximum absolute angular deflection is reduced as much as 75% by using a triple-tether over a single-tether. Further, the triple-tether setup can provide full three-dimensional stiffness even for a two-node system. However, the multi-tether configurations offer no benefit in preventing entanglement over the single-tether system due to the spread tether attachment points. Variations in TCS nodal mass distribution and radial dimension are simulated. Low inertia nodes with wide tether attachments significantly increase the rotational stiffness. Representative GEO plasma conditions are modeled to demonstrate that plasma shielding has minimal effect on TCS Coulomb inflation. Charging a TCS to negative potentials is advantageous in that only Watt levels of power are required to maintain quasi-rigid formations.

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Section: Introductionmentioning

confidence: 99%

Dynamic Feasibility Study of a Tethered Coulomb Structure

Seubert

Panosian

Schaub

2010

AIAA/AAS Astrodynamics Specialist Conference

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“…At the Lawrence Livermore National Laboratory(LLNL),they are working to develop a new type of space telescope ,based upon the use of diffractive optics [1][2][3][4] Obervation screen However, the foremost task for developing large aperture diffractive telescope is to choose a reasonable stitching pattern on the diffractive lens, because it not only affects stitching difficulty and image quality, but also affects the alignment, testing, as well as manufacturing process. Due to this reason, in this paper a study is made on the technology of stitching for large diffractive telescope.…”

Section: Introductionmentioning

confidence: 99%

Effects of stitching pattern on diffractive telescope image quality

et al. 2014

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Diffraction image technology is an updated technology. It has more potential for developing the larger aperture and lightweight telescope than the conventional refractive and reflective optics. In order to develop a large aperture diffractive telescope, the key is to solve the problem of large aperture lens stitching. Different stitching patterns have different effects on the image quality. However, the stitching pattern for diffractive telescope is different from the conventional refractive and reflective telescope. This paper, for the first time, studies the theory of stitching pattern for diffractive telescope.On the basis of theoretical analysis, a long-wavelength infrared diffractive telescope of segmented-lens is designed and for the first time, good results through stitching experiments have been achieved.According to theoretical analysis and experiment verification, the paper gives the best stitching pattern on diffractive telescope.

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“…For instance, DOE-based primary lenses show loose surface shape tolerance and are lightweight. In 1999, Hyde first proposed the Eyeglass telescope system, which uses a large-diameter diffractive lens as the primary lens and a separate telescope as the mobile eyepiece [7]. Based on this sketch, Serre et al designed a ground-based prototype and tested the telescope system.…”

Section: Introductionmentioning

confidence: 99%

“…In 2002, Hyde proposed the MOIRE system, which shares the same structure as the Eyeglass. From his studies, he demonstrated that it is very difficult to fabricate large-diameter DOEs directly, and the best way to fabricate them is to process small diffractive element sections and then properly stitch them together [9].…”

Section: Introductionmentioning

confidence: 99%

Error analysis of large-diameter subaperture stitching Fresnel diffractive elements

Zhang

Liu

et al. 2017

Appl. Opt.

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Image quality is dramatically influenced by the stitching errors in a large-diameter stitching Fresnel lens. In this paper, we studied three kinds of errors that can cover all stitching errors in a Cornwell deployed Fresnel lens. In particular, a 300-mm-diameter, three-belt deployed Fresnel diffractive lens was simulated to investigate the stitching error. The star test and the resolution board test experiments were conducted, and the experimental results fit the simulation results. This means that our error analysis theory and simulation method are efficient and accurate and could be used to guide future super-large aperture stitching.

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Eyeglass: a very large aperture diffractive space telescope

Abstract: This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author.

Cited by 42 publications

References 0 publications

Dynamic Feasibility Study of a Tethered Coulomb Structure

Dynamic Feasibility Study of a Tethered Coulomb Structure

Effects of stitching pattern on diffractive telescope image quality

Error analysis of large-diameter subaperture stitching Fresnel diffractive elements

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