Dr. Keith Shortridge Profile

Dr. Keith Shortridge

Sales Rep at Australian Astronomical Optics, Macquarie Univ

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 6 July 2018 Presentation + Paper

Presentation + Paper

PRAXIS: an OH suppression optimised near infrared spectrograph

S. Ellis, S. Bauer, C. Bacigalupo, J. Bland-Hawthorn, J. Bryant, S. Case, R. Content, T. Fechner, D. Giannone, R. Haynes, E. Hernandez, A. Horton, U. Klauser, J. Lawrence, S. Leon-Saval, E. Lindley, H.-G. Löhmannsröben, S.-S. Min, N. Pai, M. Roth, K. Shortridge, L. Waller, Pascal Xavier, Ross Zhelem

Proceedings Volume 10702, 107020P (2018) https://doi.org/10.1117/12.2311898

KEYWORDS: Spectrographs, Bragg gratings, Fiber Bragg gratings, Telescopes, Near infrared, Diffraction gratings, Optical design, Near infrared spectroscopy, Optical filters

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Proceedings Article | 9 August 2016 Paper

Paper

PRAXIS: a near infrared spectrograph optimised for OH suppression

S. Ellis, S. Bauer, J. Bland-Hawthorn, S. Case, R. Content, T. Fechner, D. Giannone, R. Haynes, E. Hernandez, A. Horton, U. Klauser, J. Lawrence, S. Leon-Saval, E. Lindley, H.-G. Löhmannsröben, S.-S. Min, N. Pai, M. Roth, K. Shortridge, Nicholas Staszak, Julia Tims, Pascal Xavier, Ross Zhelem

Proceedings Volume 9908, 99084A (2016) https://doi.org/10.1117/12.2232115

KEYWORDS: Fiber Bragg gratings, Spectrographs, Sensors, Near infrared, Astronomy, Fiber Bragg gratings, Near infrared, Optical design, Telescopes, Near infrared spectroscopy, Metrology, Spectroscopes

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Proceedings Article | 9 August 2016 Paper

Paper

The MANIFEST prototyping design study

Jonathan Lawrence, Sagi Ben-Ami, David Brown, Rebecca Brown, Scott Case, Steve Chapman, Vladimir Churilov, Matthew Colless, Robert Content, Darren Depoy, Ian Evans, Tony Farrell, Michael Goodwin, George Jacoby, Urs Klauser, Kyler Kuehn, Nuria P. Lorente, Slavko Mali, Jennifer Marshall, Rolf Muller, Vijay Nichani, Naveen Pai, Travis Prochaska, Will Saunders, Luke Schmidt, Keith Shortridge, Nicholas Staszak, Andrew Szentgyorgyi, Julia Tims, Minh Vuong, Lewis Waller, Ross Zhelem

Proceedings Volume 9908, 99089O (2016) https://doi.org/10.1117/12.2232412

KEYWORDS: Telescopes, Prototyping, Spectrographs, Optical instrument design, Optical instrument design, Cameras, Interfaces, Connectors, Metrology, Glasses, Galactic astronomy

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Proceedings Article | 2 August 2016 Paper

Paper

AAO Starbugs: software control and associated algorithms

Nuria Lorente, Minh Vuong, Keith Shortridge, Tony Farrell, Scott Smedley, Sungwook Hong, Carlos Bacigalupo, Michael Goodwin, Kyler Kuehn, Christophe Satorre

Proceedings Volume 9913, 99130U (2016) https://doi.org/10.1117/12.2233685

KEYWORDS: Telescopes, Software development, Control systems, Detection and tracking algorithms, Robots, Glasses, Metrology, Cameras, Distortion, Calibration

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SPIE Journal Paper | 10 August 2015 Open Access

Open Access

First light results from the High Efficiency and Resolution Multi-Element Spectrograph at the Anglo-Australian Telescope

Andrew Sheinis, Borja Anguiano Jimenez, Martin Asplund, Carlos Bacigalupo, Samuel Barden, Michael Birchall, Joss Bland-Hawthorn, Jurek Brzeski, Russell Cannon, Daniela Carollo, Scott Case, Andrew Casey, Vladimir Churilov, Warrick Couch, Robert Dean, Gayandhi De Silva, Valentina D’Orazi, Ly Duong, Tony Farrell, Kristin Fiegert, Kenneth Freeman, Gabriella Frost, Luke Gers, Michael Goodwin, Doug Gray, Andrew Green, Ron Heald, Jeroen Heijmans, Michael Ireland, Damien Jones, Prajwal Kafle, Stefan Keller, Urs Klauser, Yuriy Kondrat, Janez Kos, Jon Lawrence, Steve Lee, Slavko Mali, Sarah Martell, Darren Mathews, Don Mayfield, Stan Miziarski, Rolf Muller, Naveen Pai, Robert Patterson, Ed Penny, David Orr, Katharine Schlesinger, Sanjib Sharma, Keith Shortridge, Jeffrey Simpson, Scott Smedley, Greg Smith, Darren Stafford, Nicholas Staszak, Minh Vuong, Lewis Waller, Elizabeth Wylie de Boer, Pascal Xavier, Jessica Zheng, Ross Zhelem, Daniel Zucker, Tomaz Zwitter

JATIS, Vol. 1, Issue 03, 035002, (August 2015) https://doi.org/10.1117/12.10.1117/1.JATIS.1.3.035002

KEYWORDS: Spectrographs, Sensors, Mirrors, Cameras, Collimators, Telescopes, Multi-element lenses, Stars, Control systems, Charge-coupled devices

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Proceedings Article | 28 July 2014 Paper

Paper

PRAXIS: low thermal emission high efficiency OH suppressed fibre spectrograph

Robert Content, Joss Bland-Hawthorn, Simon Ellis, Luke Gers, Roger Haynes, Anthony Horton, Jon Lawrence, Sergio Leon-Saval, Emma Lindley, Seong-Sik Min, Keith Shortridge, Nick Staszak, Christopher Trinh, Pascal Xavier, Ross Zhelem

Proceedings Volume 9151, 91514W (2014) https://doi.org/10.1117/12.2055597

KEYWORDS: Spectrographs, Fiber Bragg gratings, Sensors, Microlens, Multimode fibers, Telescopes, Cameras, Absorption, Glasses, Optical design

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PRAXIS is a second generation instrument that follows on from GNOSIS, which was the first instrument using fibre Bragg gratings for OH suppression to be deployed on a telescope. The Bragg gratings reflect the NIR OH lines while being transparent to the light between the lines. This gives in principle a much higher signal-noise ratio at low resolution spectroscopy but also at higher resolutions by removing the scattered wings of the OH lines. The specifications call for high throughput and very low thermal and detector noise so that PRAXIS will remain sky noise limited even with the low sky background levels remaining after OH suppression. The optical and mechanical designs are presented. The optical train starts with fore-optics that image the telescope focal plane on an IFU which has 19 hexagonal microlenses each feeding a multi-mode fibre. Seven of these fibres are attached to a fibre Bragg grating OH suppression system while the others are reference/acquisition fibres. The light from each of the seven OH suppression fibres is then split by a photonic lantern into many single mode fibres where the Bragg gratings are imprinted. Another lantern recombines the light from the single mode fibres into a multi-mode fibre. A trade-off was made in the design of the IFU between field of view and transmission to maximize the signal-noise ratio for observations of faint, compact objects under typical seeing. GNOSIS used the pre-existing IRIS2 spectrograph while PRAXIS will use a new spectrograph specifically designed for the fibre Bragg grating OH suppression and optimised for 1.47 μm to 1.7 μm (it can also be used in the 1.09 μm to 1.26 μm band by changing the grating and refocussing). This results in a significantly higher transmission due to high efficiency coatings, a VPH grating at low incident angle and optimized for our small bandwidth, and low absorption glasses. The detector noise will also be lower thanks to the use of a current generation HAWAII-2RG detector. Throughout the PRAXIS design, from the fore-optics to the detector enclosure, special care was taken at every step along the optical path to reduce thermal emission or stop it leaking into the system. The spectrograph design itself was particularly challenging in this aspect because practical constraints required that the detector and the spectrograph enclosures be physically separate with air at ambient temperature between them. At present, the instrument uses the GNOSIS fibre Bragg grating OH suppression unit. We intend to soon use a new OH suppression unit based on multicore fibre Bragg gratings which will allow an increased field of view per fibre. Theoretical calculations show that the gain in interline sky background signal-noise ratio over GNOSIS may very well be as high as 9 with the GNOSIS OH suppression unit and 17 with the multicore fibre OH suppression unit.

Proceedings Article | 18 July 2014 Paper

Paper

The software for the AAT's HERMES instrument

Tony Farrell, Michael Birchall, Ron Heald, Keith Shortridge, Minh Vuong, Andrew Sheinis

Proceedings Volume 9152, 915223 (2014) https://doi.org/10.1117/12.2054805

KEYWORDS: Spectrographs, Lamps, Sensors, Calibration, Charge-coupled devices, Control systems, Image processing, Telescopes, Quartz, C++

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Proceedings Article | 18 July 2014 Paper

Paper

HERMES travels by CAN bus

Lewis Waller, Keith Shortridge, Tony Farrell, Minh Vuong, Rolf Muller, Andrew Sheinis

Proceedings Volume 9152, 91522A (2014) https://doi.org/10.1117/12.2055022

KEYWORDS: Spectrographs, Amplifiers, Computer programming, Servomechanisms, Control systems, Cameras, Device simulation, Software development, Sensors, Optical amplifiers

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Proceedings Article | 8 July 2014 Paper

Paper

First light results from the Hermes spectrograph at the AAT

Andrew Sheinis, Sam Barden, Michael Birchall, Daniela Carollo, Joss Bland-Hawthorn, Jurek Brzeski, Scott Case, Russell Cannon, Vladimir Churilov, Warrick Couch, Robert Dean, Gayandhi De Silva, Valentina D'Orazi, Tony Farrell, Kristin Fiegert, Kenneth Freeman, Gabriella Frost, Luke Gers, Michael Goodwin, Doug Gray, Ron Heald, Jeroen Heijmans, Damien Jones, Stephan Keller, Urs Klauser, Yuriy Kondrat, Jon Lawrence, Steve Lee, Slavko Mali, Sarah Martell, Darren Mathews, Don Mayfield, Stan Miziarski, Rolf Muller, Naveen Pai, Robert Patterson, Ed Penny, David Orr, Keith Shortridge, Jeffrey Simpson, Scott Smedley, Greg Smith, Darren Stafford, Nicholas Staszak, Minh Vuong, Lewis Waller, Elizabeth Wylie de Boer, Pascal Xavier, Jessica Zheng, Ross Zhelem, Daniel Zucker

Proceedings Volume 9147, 91470Y (2014) https://doi.org/10.1117/12.2055595

KEYWORDS: Sensors, Spectrographs, Cameras, Control systems, Collimators, Mirrors, Electronics, Charge-coupled devices, Telescopes, Stars

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Proceedings Article | 5 October 2012 Paper

Paper

Integrating the HERMES spectrograph for the AAT

Jeroen Heijmans, Martin Asplund, Sam Barden, Michael Birchall, Daniela Carollo, Joss Bland-Hawthorn, Jurek Brzeski, Scott Case, Vladimir Churilov, Matthew Colless, Robert Dean, Gayandhi De Silva, Tony Farrell, Kristin Fiegert, Kenneth Freeman, Luke Gers, Michael Goodwin, Doug Gray, Ron Heald, Anthony Heng, Damien Jones, Chiaki Kobayashi, Urs Klauser, Yuriy Kondrat, Jon Lawrence, Steve Lee, Darren Mathews, Don Mayfield, Stan Miziarski, Guy Monnet, Rolf Muller, Naveen Pai, Robert Patterson, Ed Penny, David Orr, Andrew Sheinis, Keith Shortridge, Scott Smedley, Greg Smith, Darren Stafford, Nicholas Staszak, Minh Vuong, Lewis Waller, Denis Whittard, Elisabeth Wylie de Boer, Pascal Xavier, Jessica Zheng, Ross Zhelem, Daniel Zucker

Proceedings Volume 8446, 84460W (2012) https://doi.org/10.1117/12.925806

KEYWORDS: Sensors, Spectrographs, Stars, Control systems, Device simulation, Cameras, Charge-coupled devices, Electronics, Telescopes, Collimators

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Proceedings Article | 24 September 2012 Paper

Paper

GNOSIS: a novel near-infrared OH suppression unit at the AAT

C. Trinh, S. Ellis, J. Lawrence, A. Horton, J. Bland-Hawthorn, S. Leon-Saval, J. Bryant, S. Case, M. Colless, W. Couch, K. Freeman, L. Gers, K. Glazebrook, R. Haynes, S. Lee, H.-G. Löhmannsröben, S. Miziarski, J. O'Byrne, W. Rambold, M. Roth, B. Schmidt, K. Shortridge, S. Smedley, C. Tinney, P. Xavier, J. Zheng

Proceedings Volume 8446, 84463J (2012) https://doi.org/10.1117/12.926483

KEYWORDS: Fiber Bragg gratings, Photonics, Sensors, Single mode fibers, Telescopes, Spectrographs, Signal to noise ratio, Relays, Thermal modeling, Astronomy

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Proceedings Article | 19 July 2010 Paper

Paper

Faking it for pleasure and profit: the use of hardware simulation at AAO

K. Shortridge, M. Vuong

Proceedings Volume 7740, 774008 (2010) https://doi.org/10.1117/12.856216

KEYWORDS: Device simulation, Telescopes, Computer programming, Software development, Control systems, Human-machine interfaces, Servomechanisms, Spectrographs, Hardware testing, Analog electronics

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Proceedings Article | 19 July 2010 Paper

Paper

Progress in cancellable multi-threaded control software

K. Shortridge, T. Farrell

Proceedings Volume 7740, 774029 (2010) https://doi.org/10.1117/12.856217

KEYWORDS: Data acquisition, C++, Systems modeling, Control systems, Spectrographs, Servomechanisms, Observatories, Operating systems, Charge-coupled devices, Data modeling

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Proceedings Article | 15 July 2010 Paper

Paper

HERMES: revisions in the design for a high-resolution multi-element spectrograph for the AAT

Samuelk Barden, Damien Jones, Stuart Barnes, Jeroen Heijmans, Anthony Heng, Greg Knight, David Orr, Greg Smith, Vladimir Churilov, Jurek Brzeski, Lewis Waller, Keith Shortridge, Anthony Horton, Don Mayfield, Roger Haynes, Dionne Haynes, Denis Whittard, Michael Goodwin, Scott Smedley, Ian Saunders, Peter Gillingham, Ed Penny, Tony Farrell, Minh Vuong, Ron Heald, Steve Lee, Rolf Muller, Ken Freeman, Joss Bland-Hawthorn, Daniel Zucker, Gayandhi De Silva

Proceedings Volume 7735, 773509 (2010) https://doi.org/10.1117/12.856103

KEYWORDS: Sensors, Spectrographs, Beam splitters, Cameras, Stars, Relays, Calibration, Optical design, Control systems, Lamps

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Proceedings Article | 30 September 2004 Paper

Paper

IRIS2: a working infrared multi-object spectrograph and camera

Chris Tinney, Stuart Ryder, Simon Ellis, Vladimir Churilov, John Dawson, Greg Smith, Lew Waller, John Whittard, Roger Haynes, Allan Lankshear, John Barton, C. Evans, Keith Shortridge, Tony Farrell, Jeremy Bailey

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.550980

KEYWORDS: Telescopes, Sensors, Cameras, Optical filters, Spectroscopy, Molybdenum, Image quality, Astronomical imaging, Imaging spectroscopy, Image processing

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Proceedings Article | 15 September 2004 Paper

Paper

The design of 'cancelable' data acquisition environments

Keith Shortridge, Tony Farrell

Proceedings Volume 5496, (2004) https://doi.org/10.1117/12.550357

KEYWORDS: Data acquisition, Databases, Sensors, Observatories, Operating systems, Control systems, Java, Astronomy, Computer architecture, Telescopes

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Proceedings Article | 15 September 2004 Paper

Paper

The data flow system for the AAO2 controllers

Keith Shortridge, Tony Farrell, Jeremy Bailey, Lewis Waller

Proceedings Volume 5496, (2004) https://doi.org/10.1117/12.550362

KEYWORDS: Sensors, Control systems, Fiber optics, Data processing, Image processing, Data acquisition, Interfaces, Charge-coupled devices, Human-machine interfaces, Computing systems

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Proceedings Article | 8 June 1995 Paper

Paper

DRAMA: an environment for distributed instrumentation software

Jeremy Bailey, Tony Farrell, Keith Shortridge

Proceedings Volume 2479, (1995) https://doi.org/10.1117/12.211466

KEYWORDS: Human-machine interfaces, Control systems, Observatories, Operating systems, Telecommunications, Telescopes, Distributed computing, Software development, Real-time computing, Charge-coupled devices

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Showing 5 of 18 publications

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