Prof. Gary Chanan Profile

Prof. Gary Chanan

Professor Emeritus

SPIE Involvement:

Author

Publications (37)

Proceedings Article | 11 September 2024 Presentation + Paper

Thirty Meter Telescope alignment and phasing system risk reduction studies and experiments

Matthias Schoeck, Gary Chanan, Scott Michaels, Mitchell Troy

Proceedings Volume 13094, 1309426 (2024) https://doi.org/10.1117/12.3020174

KEYWORDS: Mirrors, Thirty Meter Telescope, Algorithm development, Telescopes, Simulations, Prototyping, Observatories, Calibration, Matrices, Ion beam finishing

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Proceedings Article | 6 July 2018 Presentation + Paper

Interferometric characterization of Keck segment edge errors

Mitchell Troy, Gary Chanan, Mark Colavita, Stephen Martinek

Proceedings Volume 10700, 107000M (2018) https://doi.org/10.1117/12.2314568

KEYWORDS: Ion beam finishing, Phase measurement, Interferometers, Telescopes, Segmented mirrors

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Proceedings Article | 6 July 2018 Presentation + Paper

Chromatic effects in narrowband phasing of the Keck Telescope segments: theory and numerical simulations

Gary Chanan, Mitchell Troy

Proceedings Volume 10700, 107001E (2018) https://doi.org/10.1117/12.2310157

KEYWORDS: Mirrors, Ion beam finishing, Interferometry, Telescopes, Ion beams, Phase measurement, Phase shifts, Astronomy

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Proceedings Article | 27 July 2016 Paper

The alignment and phasing system for the Thirty Meter Telescope: risk mitigation and status update

Mitchell Troy, Gary Chanan, Scott Michaels, Frank Dekens, Randy Hein, Sebastian Herzig, Robert Karban, Carl Nissly, Jennifer Roberts, Michael Rud, Byoung-Joon Seo

Proceedings Volume 9906, 99066A (2016) https://doi.org/10.1117/12.2231913

KEYWORDS: Telescopes, Wavefronts, Control systems, Mirrors, Cameras, Thirty Meter Telescope, Image segmentation, Stars, Charge-coupled devices, Sensors

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Proceedings Article | 27 July 2016 Paper

Phasing the segments of the Keck and Thirty Meter Telescopes via the narrowband phasing algorithm: chromatic effects

Gary Chanan, Mitchell Troy, Nasrat Raouf

Proceedings Volume 9906, 99066F (2016) https://doi.org/10.1117/12.2230748

KEYWORDS: Telescopes, Algorithm development, Cameras, Thirty Meter Telescope, Mirrors, Phase measurement, Aluminum, Colorimetry, Spatial frequencies, Scattering

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Proceedings Article | 4 August 2014 Paper

Wavefront sensing and control performance modeling of the Thirty Meter telescope for systematic trade analyses

Carl Nissly, Byoung-Joon Seo, Mitchell Troy, Gary Chanan, Scott Roberts, John Rogers

Proceedings Volume 9150, 91500S (2014) https://doi.org/10.1117/12.2057157

KEYWORDS: Telescopes, Wavefronts, Adaptive optics, Wavefront sensors, Space telescopes, Performance modeling, Mirrors, Error analysis, Calibration, Thirty Meter Telescope

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Proceedings Article | 22 July 2014 Paper

On-sky measurement accuracy of Keck telescope segment surface errors

Mitchell Troy, Gary Chanan, Jenny Roberts

Proceedings Volume 9145, 91451Q (2014) https://doi.org/10.1117/12.2057094

KEYWORDS: Error analysis, Telescopes, Image segmentation, Mirrors, Wavefront sensors, Zernike polynomials, Atmospheric turbulence, Cameras, Imaging systems, Thirty Meter Telescope

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Proceedings Article | 17 September 2012 Paper

Alignment algorithms for the Thirty Meter Telescope

Gary Chanan

Proceedings Volume 8444, 844422 (2012) https://doi.org/10.1117/12.926712

KEYWORDS: Telescopes, Mirrors, Electroluminescent displays, Zernike polynomials, Wavefronts, Wavefront sensors, Algorithm development, Error analysis, Monochromatic aberrations, Thirty Meter Telescope

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Proceedings Article | 16 September 2011 Paper

Overview of the control strategies for the TMT alignment and phasing system

Piotr Piatrou, Gary Chanan

Proceedings Volume 8149, 814906 (2011) https://doi.org/10.1117/12.892253

KEYWORDS: Telescopes, Tomography, Wavefronts, Error analysis, Control systems, Device simulation, Adaptive optics, Image quality, Turbulence, Thirty Meter Telescope

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Proceedings Article | 6 August 2010 Paper

Shack-Hartmann phasing of segmented telescopes: systematic effects from lenslet arrays

Mitchell Troy, Gary Chanan, Jennifer Roberts

Proceedings Volume 7733, 77332C (2010) https://doi.org/10.1117/12.857669

KEYWORDS: Wavefront sensors, Reflection, Telescopes, Charge-coupled devices, Prisms, Diffraction, Optical lithography, Image quality, Sensors, Thirty Meter Telescope

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Proceedings Article | 17 July 2008 Paper

A conceptual design for the Thirty Meter Telescope alignment and phasing system

Mitchell Troy, Gary Chanan, Scott Michaels, Randy Bartos, Graham Bothwell, Amir Give'on, Randy Hein, Max Radin, Jenny Roberts, J. Michael Rodgers, Lawrence Scherr, Byoung-Joon Seo, David Zimmerman

Proceedings Volume 7012, 70120Y (2008) https://doi.org/10.1117/12.788560

KEYWORDS: Telescopes, Image segmentation, Cameras, Mirrors, Space telescopes, Stars, Beam splitters, Wavefronts, Wavefront sensors, Thirty Meter Telescope

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Proceedings Article | 10 July 2008 Paper

Advances in edge sensors for the Thirty Meter Telescope primary mirror

Chris Shelton, Terry Mast, Gary Chanan, Jerry Nelson, Lewis Roberts, Mitchell Troy, Mark Sirota, Byoung-Joon Seo, Daniel MacDonald

Proceedings Volume 7012, 701210 (2008) https://doi.org/10.1117/12.790415

KEYWORDS: Sensors, Calibration, Mirrors, Telescopes, Sensor calibration, Image segmentation, Motion models, Temperature metrology, Actuators, Thirty Meter Telescope

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Proceedings Article | 28 June 2006 Paper

Effects of diffraction and static wavefront errors on high-contrast imaging from the Thirty Meter Telescope

Mitchell Troy, Ian Crossfield, Gary Chanan, Philip Dumont, Joseph Green, Bruce Macintosh

Proceedings Volume 6272, 62722C (2006) https://doi.org/10.1117/12.671667

KEYWORDS: Wavefronts, Adaptive optics, Telescopes, Reflectivity, Mirrors, Diffraction, Image segmentation, Error analysis, Stars, Thirty Meter Telescope

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Proceedings Article | 23 June 2006 Paper

High-accuracy DIMM measurements for the TMT site testing program

Lianqi Wang, Matthias Schöck, Gary Chanan, Warren Skidmore, Edison Bustos, Juan Seguel, Robert Blum

Proceedings Volume 6267, 62671S (2006) https://doi.org/10.1117/12.673025

KEYWORDS: Telescopes, Turbulence, Nickel, Stars, Optical alignment, Motion measurement, Calibration, Charge-coupled devices, Data acquisition, Thirty Meter Telescope

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Proceedings Article | 23 June 2006 Paper

Edge sensor design for the TMT

Terry Mast, Gary Chanan, Jerry Nelson, Robert Minor, Richard Jared

Proceedings Volume 6267, 62672S (2006) https://doi.org/10.1117/12.672028

KEYWORDS: Sensors, Electronics, Mirrors, Telescopes, Capacitors, Temperature metrology, Capacitance, Coating, Signal to noise ratio, Thirty Meter Telescope

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Proceedings Article | 23 June 2006 Paper

The alignment and phasing system for the Thirty Meter Telescope

Gary Chanan, Mitchell Troy, Ian Crossfield, Jerry Nelson, Terry Mast

Proceedings Volume 6267, 62672V (2006) https://doi.org/10.1117/12.670894

KEYWORDS: Wavefronts, Mirrors, Telescopes, Wavefront sensors, Cameras, Astronomy, Imaging systems, Image segmentation, Control systems, Thirty Meter Telescope

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Proceedings Article | 10 June 2006 Paper

Verification of the James Webb Space Telescope coarse phase sensor using the Keck Telescope

Marc Albanese, Allan Wirth, Andrew Jankevics, Tom Gonsiorowski, Catherine Ohara, Fang Shi, Mitchell Troy, Gary Chanan, Scott Acton

Proceedings Volume 6265, 62650Z (2006) https://doi.org/10.1117/12.672055

KEYWORDS: James Webb Space Telescope, Mirrors, Calibration, Image segmentation, Sensors, Space telescopes, Telescopes, Image processing algorithms and systems, Image registration, Cameras

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Proceedings Article | 25 October 2004 Paper

Coronagraph design for an extreme adaptive optics system with spatially filtered wavefront sensing on segmented telescopes

Anand Sivaramakrishnan, Russell Makidon, Remi Soummer, Bruce Macintosh, Mitchell Troy, Gary Chanan, James Lloyd, Marshall Perrin, James Graham, Lisa Poyneer, Andrew Sheinis

Proceedings Volume 5490, (2004) https://doi.org/10.1117/12.551939

KEYWORDS: Coronagraphy, Point spread functions, Adaptive optics, Telescopes, Image segmentation, Space telescopes, Stars, Wavefront sensors, Fourier transforms, Wavefronts

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Proceedings Article | 28 September 2004 Paper

Experimental verification of dispersed fringe sensing as a segment-phasing technique using the Keck Telescope

Fang Shi, Catherine Ohara, Gary Chanan, Mitchell Troy, David Redding

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.552407

KEYWORDS: Telescopes, Space telescopes, James Webb Space Telescope, Visibility, Calibration, Sensors, Modulation, Mirrors, Diffraction, Image segmentation

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Proceedings Article | 7 July 2004 Paper

Efficient method for the reduction of large piston errors in segmented-mirror telescopes

Gary Chanan, Agusti Pinto

Proceedings Volume 5382, (2004) https://doi.org/10.1117/12.566269

KEYWORDS: Image segmentation, Telescopes, Detection and tracking algorithms, Image processing algorithms and systems, Numerical simulations, Sensors, Large telescopes, Mirrors, Diffraction, Gaussian filters

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Proceedings Article | 7 February 2003 Paper

Atmospheric turbulence characterization with the Keck adaptive optics systems

Matthias Schock, David Le Mignant, Gary Chanan, Peter Wizinowich

Proceedings Volume 4839, (2003) https://doi.org/10.1117/12.459045

KEYWORDS: Adaptive optics, Calibration, Telescopes, Wavefronts, Wavefront sensors, Atmospheric turbulence, Turbulence, Solids, Mirrors, Astronomical telescopes

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