&lt;title&gt;Integrated modeling of a semirigid hybrid mirror and a highly actuated membrane mirror as candidates for the Next Generation Space Telescope&lt;/title&gt;

Craig, Lawrence Donald; Cuerden, Brian; Jacobson, David; Kissil, Andrew; Mehle, Gregory V.; Mosier, Gary E.; Nein, M. E.; Page, Timothy P.; Pitalo, K.; Redding, David C.; Sutherlin, Steven; Wilkerson, Gary W.

doi:10.1117/12.394049

Cited by 2 publications

(7 citation statements)

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Section: Super-light Mirrorsmentioning

confidence: 99%

“…The structural, thermal and optical properties of the both types of the mirror were investigated in [37]. 1) As an example of a semi-rigid hybrid mirror for the demonstrator can be a circular mirror 1.6 m in diameter described in [20].…”

Section: Super-light Mirrorsmentioning

confidence: 99%

“…1) As an example of a semi-rigid hybrid mirror for the demonstrator can be a circular mirror 1.6 m in diameter described in [20]. It consists of a 3.2 mm thick face plate (of Zerodur) attached to a light composite core of graphite/epoxy material 7.6 cm in thickness and a back plate of the same material [20,37]. The hybrid mirror is attached with flexures and actuators to a light composite support structure of carbon fiber epoxy [38].…”

Section: Super-light Mirrorsmentioning

confidence: 99%

“…The hybrid mirror is attached with flexures and actuators to a light composite support structure of carbon fiber epoxy [38]. The own areal density of the mirror is approximately 7.4 kg/m2 [37].2) The membrane mirror in [15,28] with a great number of actuators has hexagonal shape 2 m in dimension. Its face plate made of borate-silicate glass 2 mm in thickness.…”

mentioning

confidence: 99%

“…This requires good material characteristics including low coefficient of temperature expansion (CTE), high heat conductivity within the range of temperature drops etc.. In the programs (NMSD, AMSD) of development of the mirror for the NGST [15,24,[37][38][39][40] there were mainly considered two concepts of the mirror's structure.1) semi-rigid hybrid mirror developed by COI ( Composite Optics Incorporation) 2) flexible membrane mirror with a great number of actuators (University Arizona).The structural, thermal and optical properties of the both types of the mirror were investigated in [37]. 1) As an example of a semi-rigid hybrid mirror for the demonstrator can be a circular mirror 1.6 m in diameter described in [20].…”

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Study Of Pre-Shaped Membrane Mirrors And Electrostatic Mirrors With Nonlinear-Optical Correction

Dimakov¹,

Emel'yanov²

2002

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget,, Washington, DC 20503. AGENCY USE ONLY (Leave blank)2. REPORT DATE This report results from a contract tasking Research Institute for Laser Physics as follows: The aim of this work is to improve low-weight membrane mirror characteristics intended for relaying laser communication beams in space. Such systems would use a non-linear-optical corrector to correct surface figure and other optical aberrations. The analytical part of this project is aimed at estimating the feasibility of designing the mirrors based on the pre-shaped membranes. This evaluation will give a clear understanding of the approaches to forming super-light mirrors as well as of the problems anticipated in creating this new generation of space mirrors. In the course of the experimental work, a low-weight mirror model based on the pre-shaped membrane will be fabricated, and its optical characteristics will be studied. It is expected that the characteristics predicted theoretically will be observed experimentally. The first quarterly report on project 2103p (ISTC 00-7032), entitled "Study of pre-shaped membrane mirrors and electrostatic mirrors with nonlinear-optical correction." Large telescopes and super light mirrors OverviewNowadays a number of scientific and practical fields of activity need solutions of the problems requiring high-resolution of both ground and space based telescopes with substantial space penetrating power, namely ones with large aperture mirrors.First of all, these high-resolution physical instruments are required for astronomic observations. For example, the National Research Council of the National Academy of Sciences of the USA states the strategic tasks of astronomic observations as follows: "We must use the universe as a laboratory -a unique laboratory -for probing the laws of physics in regimes not accessible on Earth, such as the very early universe or near the event horizon of a black hole." "We must search for life beyond the Earth and, if it is found, determine its nature and its distribution. And finally, we must develop a conceptual framework that accounts for all that we have observed," the report says [1]. Note that at present the requirements to a telescope for some tasks [2] are the resolution of the order of 10 -3 arcsec and space penetrating power of stars of the 35th-38th magnitude. This means that a primary mirror must be of the order of 100m in diameter.Obviously, high-resolution...

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Section: Super-light Mirrorsmentioning

confidence: 99%

Section: Super-light Mirrorsmentioning

confidence: 99%

Section: Super-light Mirrorsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Study Of Pre-Shaped Membrane Mirrors And Electrostatic Mirrors With Nonlinear-Optical Correction

Dimakov¹,

Emel'yanov²

2002

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Integrated opto-mechanical modeling with scene-based metrology techniques for structural dynamics compensation

Fahnestock

Fuentes²,

Erwin³

2004

Proceedings of the 2004 American Control Conference

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This paper provides a summary of recent work in the development of integrated, multi-physics models for controlled opto-mechanical systems. Standard approaches from the literature are used to model the dynamics of the structure, including piezoceramic actuators, and generate a simple state space system for the actuator-structure dynamics. Next, linear sensitivities of the coefficients of the standard Zernike orthonormal basis set for representing optical aberrations are generated with respect to motions of the optics around the equilibrium point, using commercially available ray-trace software. Using this linear sensitivity representation, the optical path difference (OPD) at a reference pupil plane is reconstructed. Inclusion of additional defocus terms to these Zernike coefficients yields a second aberration function to allow for the reconstruction of the OPD at a defocused pupil plane as well. For both of these planes, Fourier analysis is used to obtain the images produced at the corresponding image plane. The two images are provided to a phase diversity algorithm that returns estimates of the Zernike coefficients, yielding an estimated aberration based on sensed images. Laser metrology sensor signals are modeled via the addition of physically realistic noise to the structural perturbation signals, and are used to develop a control system that autoaligns the structure based on both the laser and phase diversity sensor measurements. The processes described herein are demonstrated on a model of an opto-mechanical system based on an approximate prescription for the Hubble Space Telescope combined with a simple flexible structure.

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<title>Integrated modeling of a semirigid hybrid mirror and a highly actuated membrane mirror as candidates for the Next Generation Space Telescope</title>

Cited by 2 publications

References 0 publications

Study Of Pre-Shaped Membrane Mirrors And Electrostatic Mirrors With Nonlinear-Optical Correction

Study Of Pre-Shaped Membrane Mirrors And Electrostatic Mirrors With Nonlinear-Optical Correction

Integrated opto-mechanical modeling with scene-based metrology techniques for structural dynamics compensation

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