Mr. Tomas Krasuski Profile

Tomas Krasuski

at GMTO Corp

SPIE Involvement:

Author

Publications (9)

Proceedings Article | 29 August 2022 Poster + Paper

Progress summary of the Giant Magellan Telescope primary mirror off-axis segment active optics control system risk reduction effort: the Test Cell

Barbara Fischer, Trupti Ranka, Francisco Aguayo, David Ashby, Marianne Cox, Austin Everman, John Ford, Tomas Krasuski, Gary Muller, Wylie Rosenthal, David Schwartz, José Soto, Hector Swett, Divya Thanasekaran, Abhijit Wadhavkar

Proceedings Volume 12182, 121823G (2022) https://doi.org/10.1117/12.2630155

KEYWORDS: Actuators, Control systems, Mirrors, Calibration, Active optics, Telescopes, Prototyping, Off axis mirrors, Electronics, Safety

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Proceedings Article | 13 December 2020 Paper

The purpose, plan, and progress of the Giant Magellan Telescope primary mirror off-axis segment test cell

Barbara Fischer, Trupti Ranka, Francisco Aguayo, Dave Ashby, Erich Bugueno, Austin Everman, John Ford, Zaven Kechichian, Kurt Kenagy, Tomas Krasuski, Gary Muller, Wylie Rosenthal, David Schwartz, Jose Soto, Hector Swett, Divya Thanasekaran, Abhijit Wadhavkar

Proceedings Volume 11445, 114451H (2020) https://doi.org/10.1117/12.2561694

KEYWORDS: Mirrors, Telescopes, Off axis mirrors, Actuators, Collimation, Active optics, Convection, Control systems, Image quality

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Proceedings Article | 13 December 2020 Poster + Paper

Device control software design for the active support system of GMT primary mirror segments

Divya Thanasekaran, Jordi Molgó, José Filgueira, Alfonso Roman, Marianne Cox, William Schoenell, Pierre Kurkdjian, Charles Plubell, Tomas Krasuski, José Soto, Hector Swett, Chien Peng, Trupti Ranka, David Ashby, Barbara Fischer, Martí Pi

Proceedings Volume 11452, 114523B (2020) https://doi.org/10.1117/12.2562919

KEYWORDS: Control systems, Mirrors, Actuators, Off axis mirrors, Observatories, Computer architecture, Software frameworks, Feature extraction, Communication engineering, Safety

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Proceedings Article | 10 July 2018 Presentation + Paper

Keck Observatory telescope control system upgrade status report

Shui Hung Kwok, Kevin Tsubota, Tomas Krasuski, Jim Lyke, Ben McCarney, Jeff Mader, Kevin McCann

Proceedings Volume 10704, 107040N (2018) https://doi.org/10.1117/12.2313876

KEYWORDS: Telescopes, Control systems, Computer programming, Mirrors, Servomechanisms, Photonic integrated circuits, Switching, Stars, Keck Observatory, Data archive systems

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Proceedings Article | 6 July 2018 Presentation + Paper

Innovations and advances in instrumentation at the W. M. Keck Observatory

Marc Kassis, Dwight Chan, Shui Kwok, Tomas Krasuski, James Lyke, Sam Ragland, Scott Lilley, Sylvain Cetre, Peter Wizinowich, Hilton Lewis, Percy Gomez, Luca Rizzi, James Larkin, Tuan Do, Michael Fitzgerald, Andy Skemer, J. Xavier Prochaska, Kyle Westfall, Ben Mazin, Dimitri Mawet, Keith Matthews, Christopher Martin, Andrew Howard, Jessica Lu, Mark Chun

Proceedings Volume 10702, 1070207 (2018) https://doi.org/10.1117/12.2312316

KEYWORDS: Adaptive optics, Telescopes, Spectrographs, Sensors, Spectroscopy, Optical fibers, Observatories, Imaging systems, Control systems, Mirrors

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Proceedings Article | 6 July 2018 Paper

Implementation of W. M. Keck Observatory's telescope control system upgrade

Tomas Krasuski, Peter Thompson, Ben McCarney, Shui Kwok, Ean James, Kevin Tsubota, Mike Pollard, Kevin McCann

Proceedings Volume 10700, 107005I (2018) https://doi.org/10.1117/12.2314165

KEYWORDS: Computer programming, Telescopes, Control systems, Information operations, Field programmable gate arrays, Mirrors, Safety, Switches, Photonic integrated circuits, Keck Observatory

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Launched in 2009, Keck Observatory’s Telescope Control System Upgrade (TCSU) project set out to improve Keck’s telescope pointing, tracking, and offsetting performance as well as increase maintainability and reliability. The project went online full time on the Keck 2 telescope in October 2017 and on the Keck 1 telescope in March 2018 after a notable delay due to a re-design of the azimuth and elevation encoder mounting systems. This paper discusses the details and challenges of implementing this large and complicated system while never requiring a shutdown of either telescope. The TCSU project replaced all of the major elements of the telescope controls, rotator and secondary mirror controls, and safety system. National Instrument’s reconfigurable I/O technology (i.e. NI RIO), with their embedded field programmable gate arrays (FPGAs), are used as the core of the telescope’s digital velocity control loop, structural filter, and tachometer filter. They were also used to create a monitoring and safety system for the rotator velocity controller as well as reading the newly installed tilt meters used to greatly improve pointing performance. Delta Tau’s family of “Brick” programmable multi-axis controllers, i.e. PMAC or BRICK, are used to control the rotator and secondary mirror. They enable better tuning and faster slew speeds for these subsystems. An Allen Bradley’s ControlLogix® controller and the family of FLEX™ Input/Output (IO) modules were used to create a distributed safety system able to handle a wide variety of signal types. This technology refresh based on commercial off the shelf equipment replaced much of our obsolete and custom equipment. A significant part of the project was the installation of new telescope azimuth and elevation position encoders based on Heidenhain’s 40 micron grading tape scales. Interpolated to a 10 nanometer resolution, the new encoders provide true 4 mas resolution in azimuth and 1 mas resolution in elevation. This is a big improvement to Keck’s position sensing when compared to the old rotary incremental encoders. The installation required a significant amount of mechanical infrastructure to house them. Additionally, two tilt meters were installed to sense the telescope’s varying vertical angle as a function of azimuth, mainly due to the azimuth bearing’s axial runout. The encoders and tilt meters are the primary reason for achieving the greatly improved pointing and tracking performance [1]. Finally, a switching solution using solid state relays and dual network switches was installed to provide seamless and rapid switching between the old and new control systems during commissioning. Although this component is a simple design and does not boast of any new technology, it is one of the key components that enabled the successful testing of the new equipment while keeping the old system operational as a backup for night time observing as well as for baseline performance comparisons. It allowed us to switch a variety of signal types and was very cost effective when compared to available products.

Proceedings Article | 8 August 2016 Paper

Improving the pointing and tracking performance of the Keck telescopes

Shui Hung Kwok, Tomas Krasuski, Jim Lyke, Jeff Mader, Kevin McCann, Kevin Tsubota

Proceedings Volume 9913, 991305 (2016) https://doi.org/10.1117/12.2231825

KEYWORDS: Telescopes, Computer programming, Control systems, Performance modeling, Calibration, Stars, Space telescopes, Data modeling, Cameras, Sensors

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Proceedings Article | 22 July 2014 Paper

Keck telescope mount control redesign to improve short move performance

Peter Thompson, Tomas Krasuski, Kevin Tsubota, Jimmy Johnson

Proceedings Volume 9145, 914557 (2014) https://doi.org/10.1117/12.2057225

KEYWORDS: Electroluminescence, Control systems, Telescopes, Computer programming, Radium, Phase modulation, Linear filtering, Amplifiers, Field programmable gate arrays, Analog electronics

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Proceedings Article | 12 July 2008 Paper

AO operations at the W. M. Keck Observatory

Randall Campbell, David Le Mignant, Marcos van Dam, Al Conrad, Kenny Grace, Marc Kassis, James Lyke, Hien Tran, Jason Chin, Elizabeth Chock, Steven Doyle, Robert Goodrich, Erik Johansson, Tomas Krasuski, Christine Melcher, Douglas Summers, Roger Sumner, Peter Wizinowich

Proceedings Volume 7016, 701604 (2008) https://doi.org/10.1117/12.790118

KEYWORDS: Adaptive optics, Telescopes, Observatories, Stars, Keck Observatory, Satellites, Laser safety, Safety, Calibration, Space telescopes

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Showing 5 of 9 publications

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