&lt;title&gt;Recent enhancements of the Phased Array Mirror Extendible Large Aperture (PAMELA) telescope testbed at MSFC&lt;/title&gt;

Rakoczy, John; Montgomery, Edward; Lindner, Jeffrey L.

doi:10.1117/12.393940

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Three of these actuators provide the high frequency drive capability and the other three are passive devices, used to damp out high frequency vibrations within the structure. Although adequate damping may be possible using only the control actuators, passive damping of the DSM has proved crucial for both conventional DSM and earlier NASA program to develop segmented mirror technology [9].…”

Section: Design Of Segmentmentioning

confidence: 99%

Segmented Deformable Mirrors for Ground Layer Adaptive Optics

Kibblewhite¹

2017

Proceedings of the Adaptive Optics for Extremely Large Telescopes 5

View full text Add to dashboard Cite

Current designs of monolithic deformable secondary mirrors use a dense actuator spacing, both to achieve adequate fitting error and damping to the thin faceplate. Ground layer AO can be effective with less actuators but damping may become more of a problem. A highly segmented architecture for the deformable secondary should be able to achieve good GLAO performance with less cost and complexity, especially for the next generation telescopes. This paper discusses the design of one such mirror optimized for a 12-meter class telescope. It is shown that the forces required to control the segments should be ≈ 0.02N/actuator and that the electronics can be integrated into the segment itself. Total power requirements of less than 100 watts/m 2 , with a total weight of less than 100 kg/m 2 appear possible. The technology is directly scalable to the large DSMs required by ELTs. The use of single LGS beacons for wide field AO is also discussed. It is suggested that a single Rayleigh beacon can reduce the FWHM by a factor of over 2 over a 5 arc-minute field of view for a 12 m telescope at a site similar to Mauna Kea. A factor of 5 reduction may be possible over a 1 arc-minute field of view using a sodium beacon.

show abstract

Section: Design Of Segmentmentioning

confidence: 99%

Segmented Deformable Mirrors for Ground Layer Adaptive Optics

Kibblewhite¹

2017

Proceedings of the Adaptive Optics for Extremely Large Telescopes 5

View full text Add to dashboard Cite

show abstract

“…A different method, demonstrated in the Phased Array Mirror Extendible Large Aperture (PAMELA), sought to decentralize the global control strategy (Rather et al 1989;Ames et al 1995;Rakoczy et al 2000). In the PAMELA test bed (a 36 hexagonal segment, 0.5 m diameter primary mirror), a ShackHartmann wave-front sensor was employed to sense tip and tilt motions of each segment.…”

Section: Introductionmentioning

confidence: 99%

Genetic Algorithm Phase Retrieval for the Systematic Image‐Based Optical Alignment Test Bed

Taylor

King

Steincamp

et al. 2006

PUBL ASTRON SOC PAC

View full text Add to dashboard Cite

ABSTRACT.A real-valued genetic algorithm with random rank-based selection is shown to successfully estimate the multiple phases of a segmented optical system modeled on the seven-mirror Systematic Image-Based Optical Alignment test bed located at NASA's Marshall Space Flight Center. Comparisons are made between this and more traditional phase-retrieval methods. No significant increase in computational speed is observed using the genetic algorithm technique.

show abstract

“…The 20 -20 telescope elements, which have seven 8.4-m-diameter segments, 1 and the Phased Array Mirror Extendible Large Aperture ͑PAMELA͒, with 8-cm-diameter segments, [2][3][4] represent the extremes of the design space. The Keck telescopes, with 1.8-m-diameter segments, 5 and the Hobby-Eberly Telescope, with 1.15-m-diameter segments, 6,7 are the only working multiple-mirror telescopes.…”

Section: Introductionmentioning

confidence: 99%

Design considerations for a highly segmented mirror

Padin

2003

Appl. Opt.

View full text Add to dashboard Cite

Design issues for a 30-m highly segmented mirror are explored, with emphasis on parametric models of simple, inexpensive segments. A mirror with many small segments offers cost savings through quantity production and permits high-order active and adaptive wave-front corrections. For a 30-m f͞1.5 paraboloidal mirror made of spherical, hexagonal glass segments, with simple warping harnesses and threepoint supports, the maximum segment diameter is ϳ100 mm, and the minimum segment thickness is ϳ5 mm. Large-amplitude, low-order gravitational deformations in the mirror cell can be compensated if the segments are mounted on a plate floating on astatic supports. Because gravitational deformations in the plate are small, the segment actuators require a stroke of only a few tens of micrometers, and the segment positions can be measured by a wave-front sensor.

show abstract

<title>Recent enhancements of the Phased Array Mirror Extendible Large Aperture (PAMELA) telescope testbed at MSFC</title>

Cited by 4 publications

References 0 publications

Segmented Deformable Mirrors for Ground Layer Adaptive Optics

Segmented Deformable Mirrors for Ground Layer Adaptive Optics

Genetic Algorithm Phase Retrieval for the Systematic Image‐Based Optical Alignment Test Bed

Design considerations for a highly segmented mirror

Contact Info

Product

Resources

About