Dr. Nicholas Herrald Profile

Dr. Nicholas Herrald

at Australian National Univ

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Author

Publications (14)

Proceedings Article | 3 January 2020 Paper

Design concept for Pocket-GMT

M. Lingham, A. Bouchez, L. Gers, N. Herrald, J. Munro, T. Travouillon

Proc. SPIE. 11203, Advances in Optical Astronomical Instrumentation 2019

KEYWORDS: Telescopes, Mirrors, Metrology, Wavefront sensors, Control systems design

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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

Proc. SPIE. 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII

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

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Proceedings Article | 11 July 2018 Paper

Stirling cycle cryocooler exported vibration analysis

Annino Vaccarella, Robert Boz, Robert Sharp, Michael Ellis, Andrew Bish, David Adams, David Chandler, Luke Gers, James Gilbert, John Hart, Nick Herrald, Mike Petkovic

Proc. SPIE. 10703, Adaptive Optics Systems VI

KEYWORDS: Cooling systems, Observatories, Telescopes, Electronics, Avalanche photodetectors, Imaging systems, Sensors, Vibrometry, Optical isolators, Cryocoolers

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Proceedings Article | 10 July 2018 Presentation + Paper

A conceptual design study for Subaru ULTIMATE GLAO

François Rigaut, Yosuke Minowa, Masayuki Akiyama, Yoshito Ono, Visa Korkiakoski, Nick Herrald, Gaston Gausachs, Christophe Clergeon, Shiang-Yu Wang, Céline d'Orgeville, Jordan Davies, Yusei Koyama, Ikuru Iwata, Tadayuki Kodama, Kentrao Motohara, Yutaka Hayano, Ichi Tanaka, Takashi Hattori, Michitoshi Yoshida

Proc. SPIE. 10703, Adaptive Optics Systems VI

KEYWORDS: Near infrared, Telescopes, Spectrographs, Stars, Imaging systems, Wavefront sensors, Adaptive optics, Monte Carlo methods, Turbulence, Astronomical imaging

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Proceedings Article | 10 July 2018 Paper

Lens mounting techniques for precise radial location of fragile lenses in the NGS2 and Veloce instruments

Nicholas Herrald, Francis Bennet, Celine D'Orgeville, Francois Rigaut, Ian Price, James Gilbert

Proc. SPIE. 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

KEYWORDS: Cameras, Glasses, Interfaces, Spherical lenses, Tolerancing, Failure analysis

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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

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

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

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Proceedings Article | 6 July 2018 Presentation + Paper

Veloce Rosso: Australia's new precision radial velocity spectrograph

James Gilbert, Christoph Bergmann, Gabe Bloxham, Robert Boz, Robert Brookfield, Tom Carkic, Brad Carter, Scott Case, Vladimir Churilov, Michael Ellis, Gaston Gausachs, Luke Gers, Doug Gray, Nicholas Herrald, Michael Ireland, Damien Jones, Yevgen Kripak, Jon Lawrence, Ellie O'Brien, Ian Price, Matthew Robertson, Christian Schwab, Chris Tinney, Annino Vaccarella, Colin Vest, Duncan Wright, Ross Zhelem

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

KEYWORDS: Observatories, Telescopes, Spectrographs, Astronomy, Sensors, Calibration, Image processing, Control systems, Relays, Optical benches

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Proceedings Article | 6 July 2018 Paper

Veloce environmental control system

Gaston Gausachs, Robert Boz, Tom Carkic, Michael Ellis, James Gilbert, Nicholas Herrald, Michael Ireland, Ellie O'Brien, Ian Price, Matthew Robertson, Colin Vest

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

KEYWORDS: Spectrographs, Control systems, Optical benches, Control systems design

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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

Proc. SPIE. 9908, Ground-based and Airborne Instrumentation for Astronomy VI

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

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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

Proc. SPIE. 9908, Ground-based and Airborne Instrumentation for Astronomy VI

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

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Proceedings Article | 26 July 2016 Paper

NGS2: a focal plane array upgrade for the GeMS multiple tip-tilt wavefront sensor

François Rigaut, Ian Price, Céline d'Orgeville, Francis Bennet, Nick Herrald, Nicolas Paulin, Kristina Uhlendorf, Vincent Garrel, Gaetano Sivo, Vanessa Montes, Chad Trujillo

Proc. SPIE. 9909, Adaptive Optics Systems V

KEYWORDS: Stars, Gemini Observatory, Cameras, Sensors, Wavefront sensors, Control systems, Distortion, Objectives, Electron multiplying charge coupled devices, Electroluminescent displays

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Proceedings Article | 26 July 2016 Paper

AO corrected satellite imaging from Mount Stromlo

F. Bennet, F. Rigaut, I. Price, N. Herrald, I. Ritchie, C. Smith

Proc. SPIE. 9909, Adaptive Optics Systems V

KEYWORDS: Telescopes, Stars, Imaging systems, Cameras, Satellites, Wavefront sensors, Adaptive optics, Adaptive optics, Satellite imaging, Satellite imaging, Space telescopes, Space telescopes, Electroluminescent displays

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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

Proc. SPIE. 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II

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

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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 | 22 July 2016 Paper

GMTIFS: cryogenic rotary mechanisms for the GMT Integral-Field Spectrograph

John Hart, Brady Espeland, Gabe Bloxham, Robert Boz, Dave Bundy, John Davies, Bart Fordham, Nick Herald, Rob Sharp, Annino Vaccarella, Colin Vest

Proc. SPIE. 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II

KEYWORDS: Spectrographs, Beam splitters, Imaging systems, Sensors, Interfaces, Spectral resolution, Aluminum, Mechanical engineering, Cryogenics, Diffraction gratings

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Showing 5 of 14 publications

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