Mr. Jon G. Nielsen Profile

Jon G. Nielsen

at Australian National Univ

SPIE Involvement:

Author

Publications (12)

Proceedings Article | 29 August 2022 Poster + Paper

The Gemini-South High-Resolution Optical Spectrograph (GHOST) data reduction system

Christian R. Hayes, Fletcher Waller, Michael Ireland, Jon Nielsen, Marc White, Joao Bento, Kim Venn, John Pazder, Alan McConnachie, Chris Simpson, Kathleen Labrie

Proceedings Volume 12184, 121846H (2022) https://doi.org/10.1117/12.2642905

KEYWORDS: Spectrographs, Gemini Observatory, Image processing, Calibration, Stars, Sun, Chemical elements, Instrument modeling

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Proceedings Article | 12 July 2018 Paper

Cryogenic detector preamplifer developments at the ANU

Annino Vaccarella, Robert Sharp, Michael Ellis, Antonin Bouchez, Rodolphe Conan, R. Boz, David Bundy, Gaston Gausachs, James Gilbert, Luke Gers, John Hart, Nick Herrald, Michael Ireland, Jon Nielsen, Ian Price, Colin Vest, Henry Zovaro

Proceedings Volume 10709, 1070923 (2018) https://doi.org/10.1117/12.2313023

KEYWORDS: Cryogenics, Sensors, Charge-coupled devices, Detector development, Avalanche photodetectors, Imaging systems, Optical filters, Spectrographs, Telescopes, Copper

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Proceedings Article | 6 July 2018 Paper

Data reduction software for the Gemini high resolution optical spectrograph

Michael Ireland, Marc White, Joao Bento, Tony Farrell, Kathleen Labrie, Lance Luvaul, Jon Nielsen, Chris Simpson

Proceedings Volume 10707, 1070735 (2018) https://doi.org/10.1117/12.2314418

KEYWORDS: Spectrographs, Gemini Observatory, Calibration, Image processing, Data modeling, Data processing, Stars, Optical fibers

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Proceedings Article | 6 July 2018 Paper

Final design and assembly of the GHOST Cassegrain unit

Ross Zhelem, Vladimir Churilov, Yuriy Kondrat, Lewis Waller, Jon Lawrence, Michael Edgar, Gabriella Baker, Tony Farrel, Peter Young, Jon Nielsen, Slavko Mali, Rolf Muller, Urs Klauser, Naveen Pai, Michael Ireland, Andrew Sheinis, Gordon Robertson, Scott Case, Richard McDermid

Proceedings Volume 10702, 107026H (2018) https://doi.org/10.1117/12.2313059

KEYWORDS: Prisms, Telescopes, Gemini Observatory, Spectrographs, Cameras, Servomechanisms, Control systems, Electronics

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Proceedings Article | 6 July 2018 Presentation + Paper

GHOST instrument control software: a progress report

Jon Nielsen, Ian Price, Peter Young, Michael Ireland

Proceedings Volume 10707, 1070706 (2018) https://doi.org/10.1117/12.2313068

KEYWORDS: Optical fibers, Gemini Observatory, Cameras, Sensors, Spectrographs, Java, Calibration, Collision avoidance, Control systems, Astronomy

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Proceedings Article | 6 July 2018 Presentation + Paper

Design evolution of the Giant Magellan Telescope Integral Field Spectrograph, GMTIFS

R. Sharp, D. Adams, G. Bloxham, R. Boz, D. Bundy, D. Chandler, G. Gausachs, L. Gers, J. Hart, N. Herrald, J. Nielsen, E. O'Brien, C. Onken, I. Price, A. Vaccarella, C. Vest, P. Young

Proceedings Volume 10702, 107021V (2018) https://doi.org/10.1117/12.2313010

KEYWORDS: Sensors, Adaptive optics, Imaging systems, Spectrographs, Optical benches, Iterated function systems, Wavefront sensors, Prototyping, Telescopes, Optical design

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Proceedings Article | 9 August 2016 Paper

Avalanche photo diodes in the observatory environment: lucky imaging at 1-2.5 microns

A. Vaccarella, R. Sharp, M. Ellis, S. Singh, G. Bloxham, A. Bouchez, R. Conan, R. Boz, D. Bundy, J. Davies, B. Espeland, J. Hart, N. Herrald, M. Ireland, G. Jacoby, J. Nielsen, C. Vest, P. Young, B. Fordham, A. Zovaro

Proceedings Volume 9908, 99082X (2016) https://doi.org/10.1117/12.2231557

KEYWORDS: Sensors, Observatories, Imaging systems, Adaptive optics, Observatories, Imaging systems, Telescopes, Cryogenics, Avalanche photodetectors, Space telescopes, Electronics, Copper

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Proceedings Article | 9 August 2016 Paper

GMTIFS: The Giant Magellan Telescope integral fields spectrograph and imager

Rob Sharp, G. Bloxham, R. Boz, D. Bundy, J. Davies, B. Espeland, B. Fordham, J. Hart, N. Herrald, J. Nielsen, A. Vaccarella, C. Vest, P. Young, P. McGregor

Proceedings Volume 9908, 99081Y (2016) https://doi.org/10.1117/12.2231561

KEYWORDS: Spectrographs, Adaptive optics, Imaging systems, Iterated function systems, Telescopes, Sensors, Galactic astronomy, Mirrors, Stars, Cameras

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Proceedings Article | 26 July 2016 Paper

GHOST and GIAPI: experience using Gemini's new instrument control system framework

Peter Young, Jon Nielsen

Proceedings Volume 9913, 99132Q (2016) https://doi.org/10.1117/12.2232235

KEYWORDS: Gemini Observatory, Gemini Observatory, Control systems, Software development, Spectrographs, Telescopes, Java, National Ignition Facility, Databases, Cameras, Instrument modeling

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Proceedings Article | 22 July 2016 Paper

GMTIFS: the adaptive optics beam steering mirror for the GMT integral-field spectrograph

J. Davies, G. Bloxham, R. Boz, D. Bundy, B. Espeland, B. Fordham, J. Hart, N. Herrald, J. Nielsen, R. Sharp, A. Vaccarella, C. Vest, P. Young

Proceedings Volume 9912, 991217 (2016) https://doi.org/10.1117/12.2231560

KEYWORDS: Beam steering, Mirrors, Actuators, Sensors, Cryogenics, Stars, Adaptive optics, Spectrographs, Interferometry, Servomechanisms

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To achieve the high adaptive optics sky coverage necessary to allow the GMT Integral-Field Spectrograph (GMTIFS) to access key scientific targets, the on-instrument adaptive-optics wavefront-sensing (OIWFS) system must patrol the full 180 arcsecond diameter guide field passed to the instrument. The OIWFS uses a diffraction limited guide star as the fundamental pointing reference for the instrument. During an observation the offset between the science target and the guide star will change due to sources such as flexure, differential refraction and non-sidereal tracking rates. GMTIFS uses a beam steering mirror to set the initial offset between science target and guide star and also to correct for changes in offset. In order to reduce image motion from beam steering errors to those comparable to the AO system in the most stringent case, the beam steering mirror is set a requirement of less than 1 milliarcsecond RMS. This corresponds to a dynamic range for both actuators and sensors of better than 1/180,000.

The GMTIFS beam steering mirror uses piezo-walk actuators and a combination of eddy current sensors and interferometric sensors to achieve this dynamic range and control. While the sensors are rated for cryogenic operation, the actuators are not. We report on the results of prototype testing of single actuators, with the sensors, on the bench and in a cryogenic environment. Specific failures of the system are explained and suspected reasons for them. A modified test jig is used to investigate the option of heating the actuator and we report the improved results. In addition to individual component testing, we built and tested a complete beam steering mirror assembly. Testing was conducted with a point source microscope, however controlling environmental conditions to less than 1 micron was challenging. The assembly testing investigated acquisition accuracy and if there was any un-sensed hysteresis in the system. Finally we present the revised beam steering mirror design based on the outcomes and lessons learnt from this prototyping.

Proceedings Article | 24 September 2012 Paper

GMT integral-field spectrograph (GMTIFS) conceptual design

Peter McGregor, G. Bloxham, R. Boz, J. Davies, M. Doolan, M. Ellis, J. Hart, D. Jones, L. Luvaul, J. Nielsen, S. Parcell, R. Sharp, D. Stevanovic, P. Young

Proceedings Volume 8446, 84461I (2012) https://doi.org/10.1117/12.925259

KEYWORDS: Mirrors, Iterated function systems, Imaging systems, Telescopes, Stars, Sensors, Spectrographs, Galactic astronomy, Adaptive optics, Atmospheric sciences

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Proceedings Article | 21 July 2008 Paper

Achieving design reuse: a case study

Peter Young, Jon Nielsen, William Roberts, Greg Wilson

Proceedings Volume 7019, 70192M (2008) https://doi.org/10.1117/12.787698

KEYWORDS: Cameras, Telescopes, Human-machine interfaces, Gemini Observatory, Control systems, Sensors, Databases, Instrument modeling, National Ignition Facility, Imaging systems

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Showing 5 of 12 publications

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