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Systematic Radio Telescope Alignment Using Portable Fringe Projection Profilometry

Nanomanufacturing and Metrology 2024年第1期7卷 75-85页

作者： Joel Berkson Justin Hyatt Nathan Julicher Byeongjoon Jeong Isaac Pimienta Rachel Ball Wyatt Ellis Jason Voris Diego Torres‑Barajas daewook kim James C.Wyant College of Optical Sciences University of Arizona1630 E.University Blvd.TucsonAZ 85721USA Department of Astronomy at Steward Observatory University of Arizona933 N Cherry Ave.TucsonAZ 85721USA

In 2019,the Event Horizon Telescope(EHT)released the first-ever image of a black hole event *** are now aiming for higher angular resolutions of distant targets,like black holes,to understand more about the fundamental laws of gravity that govern our *** achieve this higher resolution and increased sensitivity,larger radio telescopes are needed to operate at higher frequencies and in larger *** like the next-generation Very Large Array(ngVLA)and the Square-Kilometer Array(SKA)require building hundreds of telescopes with diameters greater than 10 ms over the next *** has a twofold *** telescope surfaces need to be more accurate to operate at higher frequencies,and the logistics involved in maintaining a radio telescope need to be simplified to support them properly in large *** of these problems can be solved with improved methods for surface metrology that are faster and more accurate with a higher *** leads to faster and more accurate panel alignment and,therefore,a more productive *** this paper,we present the use of binocular fringe projection profilometry as a solution to this problem and demonstrate it by aligning two panels on a 3-m radio telescope *** measurement takes only 10 min and directly delivers feedback on the tip,tilt,and piston of each panel to create the ideal reflector shape.

关键词： Metrology Fringe projection profilometry Off-axis alignment Radio astronomy Radio antenna

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Adaptive Thermoforming and Structural Design of Millimeter-Wave Antenna Panels

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Nanomanufacturing and Metrology 2022年第4期5卷 327-335页

作者： Zack Hatfield Alex St.Peter Christian Davila-Peralta Joel Berkson daewook kim Justin Hyatt James C.Wyant College of Optical Sciences University of Arizona1630 E.University BlvdTucsonAZ85721USA Department of Astronomy and Steward Observatory University of Arizona933 N.Cherry AveTucsonAZ85721USA

Future large-scale radio telescope observatories,such as the next-generation Very Large Array,involve extremely large collection *** collection areas are divided into smaller shaped panels,which typically require their own unique molds to *** these projects to be cost-effective,an efficient fabrication method for the shaped panels is *** paper outlines the development and success of a novel adaptive freeform panel molding technology that greatly improves manufacturing efficiency due to its repeatable and reusable ***,it presents an analysis of a proposed panel structural design for the shaped panels,which incorporates a study on surface deformation due to gravity and wind loading under realistic operational conditions.

关键词： Radio telescope Millimeter-wave Thermoform Adaptable mold

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Advances in optical engineering for future telescopes

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Opto-Electronic Advances 2021年第6期4卷 20-43页

作者： daewook kim Heejoo Choi Trenton Brendel Henry Quach Marcos Esparza Hyukmo Kang Yi-Ting Feng Jaren NAshcraft Xiaolong Ke Tianyi Wang Ewan SDouglas Wyant College of Optical Sciences University of Arizona1630 E.University Blvd.TucsonAZ 85721USA Department of Astronomy and Steward Observatory University of Arizona933 N.Cherry Ave.TucsonAZ 85721USA Large Binocular Telescope Observatory University of Arizona933 N.Cherry Ave.TucsonAZ 85721USA School of Mechanical and Automotive Engineering Xiamen University of TechnologyXiamen 361024China National Synchrotron Light Source II(NSLS-II) Brookhaven National LaboratoryPO Box 5000UptonNew York 11973USA.

Significant optical engineering advances at the University of Arizona are being made for design, fabrication, and construction of next generation astronomical telescopes. This summary review paper focuses on the technological advances in three key areas. First is the optical fabrication technique used for constructing next-generation telescope mirrors. Advances in ground-based telescope control and instrumentation comprise the second area of development. This includes active alignment of the laser truss-based Large Binocular Telescope(LBT) prime focus camera, the new MOBIUS modular cross-dispersion spectroscopy unit used at the prime focal plane of the LBT, and topological pupil segment optimization. Lastly, future space telescope concepts and enabling technologies are discussed. Among these, the Nautilus space observatory requires challenging alignment of segmented multi-order diffractive elements. The OASIS terahertz space telescope presents unique challenges for characterizing the inflatable primary mirror, and the Hyperion space telescope pushes the limits of high spectral resolution, far-UV spectroscopy. The Coronagraphic Debris and Exoplanet Exploring Pioneer(CDEEP) is a Small Satellite(Small Sat) mission concept for high-contrast imaging of circumstellar disks and exoplanets using vector vortex coronagraph. These advances in optical engineering technologies will help mankind to probe, explore, and understand the scientific beauty of our universe.

关键词： computer controlled optical surfacing CCOS multiplexing dwell time optimization optical metrology telescope alignment large binocular telescope MOBIUS pupil segmentation OASIS nautilus hyperion CDEEP vector vortex coronagraph

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