Dr. Locke D. Spencer Profile

Dr. Locke D. Spencer

Associate Professor / Canada Research Chair (II) at Univ of Lethbridge

SPIE Involvement:

Author

Publications (23)

Proceedings Article | 29 August 2024 Presentation + Paper

Presentation + Paper

Considerations for a next-generation Great Observatory class space-based interferometer for far-infrared astronomy

Berke Ricketti, Locke Spencer, David Leisawitz, Lee Mundy, David Wilner, Chris Benson, Gerard van Belle, Colm Bracken, Giorgio Savini, Jeremy Scott, William Grainger, Hannah Rana, Matteo Bonato, Duncan Farrah, Conor Nixon

Proceedings Volume 13095, 130951T (2024) https://doi.org/10.1117/12.3019681

KEYWORDS: Spatial resolution, Observatories, Telescopes, Astronomical interferometers, Observational astronomy, Space telescopes, Interferometers, James Webb Space Telescope, Infrared telescopes, Galactic astronomy

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Astronomy at far-infrared (far-IR) wavelengths is essential to our understanding of the evolution of the cosmos, from the star formation history of galaxies to how the ice distribution affects the formation of extrasolar planetary systems. The Hubble Space Telescope, James Webb Space Telescope, and the Atacama Large Millimeter Array have already produced ground-breaking astronomical observations with high angular resolution spanning the visible to sub-millimetre wavelength regimes. However, this presents a gap in the far-IR, from roughly 30−400μm, where ground-based observations are largely intractable due to the opacity of Earth’s atmosphere. Indeed, no telescope, observatory, or interferometry array has ever achieved sub-arcsecond angular resolution over this wavelength range. A space-based solution is needed. However, a space-based far-IR telescope capable of subarcsecond angular resolution and high sensitivity, at a cost comparable to the largest space missions to date, presents unique physical, practical, and engineering challenges. In this paper, we envisage what a far-IR Great Observatory class mission might look like in the context of the already-studied Origins Space Telescope (OST) and the Space Infrared Interferometric Telescope (SPIRIT). We begin with a historical reflection of far-IR missions, including OST and the recommendations by the Astro2020 Decadal Survey for a de-scoped mission. We use this to motivate the recommendation of a space-based interferometer as a reasonable path towards sub-arcsecond angular resolution at far-IR wavelengths. Using the SPIRIT mission concept as inspiration, we consider multiple point designs for a two element, structurally connected spatial-spectral space-based far-IR interferometer to understand the implications on achieved angular resolution and estimate total mission cost in context of the Decadal Survey recommended far-IR Great Observatory cost cap. This paper illustrates the unique capabilities only possible through a space-based far-IR double Fourier interferometry mission capable of sub-arcsecond resolution.

Proceedings Article | 28 August 2024 Poster + Paper

Poster + Paper

Demonstrating complex visibility measurements and image reconstruction using a double-Fourier interferometer testbed

Jeremy Scott, Locke Spencer, Chris Benson

Proceedings Volume 13095, 1309537 (2024) https://doi.org/10.1117/12.3020640

KEYWORDS: Visibility, Fourier transforms, Fourier transform interferometers, Interferograms, Spatial resolution, Equipment, Astronomical interferometers, Far infrared

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Proceedings Article | 28 August 2024 Presentation + Paper

Presentation + Paper

The Large Interferometer For Exoplanets (LIFE): a space mission for mid-infrared nulling interferometry

Adrian Glauser, Sascha Quanz, Jonah Hansen, Felix Dannert, Michael Ireland, Hendrik Linz, Olivier Absil, Eleonora Alei, Daniel Angerhausen, Thomas Birbacher, Denis Defrère, Andrea Fortier, Philipp Huber, Jens Kammerer, Romain Laugier, Tim Lichtenberg, Lena Noack, Mohanakrishna Ranganathan, Sarah Rugheimer, Vladimir Airapetian, Yann Alibert, Pedro Amado, Marius Anger, Narsireddy Anugu, Max Aragon, David Armstrong, Amedeo Balbi, Olga Balsalobre-Ruza, Deepayan Banik, Mathias Beck, Surendra Bhattarai, Jonas Biren, Jacopo Bottoni, Marrick Braam, Alexis Brandeker, Lars Buchhave, José Caballero, Juan Cabrera, Ludmila Carone, Óscar Carrión-González, Amadeo Castro-González, Kenny Chan, Ligia Coelho, Tereza Constantinou, Nicolas Cowan, William Danchi, Colin Dandumont, Jeanne Davoult, Arjun Dawn, Jean-Pierre de Vera, Pieter de Visser, Caroline Dorn, Juan Duque Lara, Mark Elowitz, Steve Ertel, Yuedong Fang, Simon Felix, Jonathan Fortney, Malcolm Fridlund, Antonio García Muñoz, Cedric Gillmann, Gregor Golabek, John Lee Grenfell, Greta Guidi, Octavio Guilera, Janis Hagelberg, Janina Hansen, Jacob Haqq-Misra, Nathan Hara, Ravit Helled, Konstantin Herbst, Nina Hernitschek, Sasha Hinkley, Takahiro Ito, Satoshi Itoh, Stavro Ivanovski, Markus Janson, Anders Johansen, Hugh Jones, Stephen Kane, Daniel Kitzmann, Andjelka Kovacevic, Stefan Kraus, Oliver Krause, J. M. Diederik Kruijssen, Rolf Kuiper, Alen Kuriakose, Lucas Labadie, Sylvestre Lacour, Antonino Lanza, Laurits Leedjärv, Monika Lendl, Michaela Leung, Jorge Lillo-Box, Jérôme Loicq, Rafael Luque, Suvrath Mahadevan, Liton Majumdar, Fabien Malbet, Franco Mallia, Joice Mathew, Taro Matsuo, Elisabeth Matthews, Victoria Meadows, Bertrand Mennesson, Michael Meyer, Karan Molaverdikhani, Paul Mollière, John Monnier, Ramon Navarro, Benard Nsamba, Kenshiro Oguri, Apurva Oza, Enric Palle, Carina Persson, Joe Pitman, Eva Plávalová, Francisco Pozuelos, Andreas Quirrenbach, Ramses Ramirez, Ansgar Reiners, Ignasi Ribas, Malena Rice, Berke Vow Ricketti, Peter Roelfsema, Amedeo Romagnolo, María Paula Ronco, Martin Schlecker, Jessica Schonhut-Stasik, Edward Schwieterman, Antranik Sefilian, Eugene Serabyn, Chinmay Shahi, Siddhant Sharma, Laura Silva, Swapnil Singh, Evan Sneed, Locke Spencer, Vito Squicciarini, Johannes Staguhn, Karl Stapelfeldt, Keivan Stassun, Motohide Tamura, Benjamin Taysum, Floris van der Tak, Tim van Kempen, Gautam Vasisht, Haiyang Wang, Robin Wordsworth, Mark Wyatt

Proceedings Volume 13095, 130951D (2024) https://doi.org/10.1117/12.3019090

KEYWORDS: Nulling interferometry, Space operations, Planets, Beam combiners, Exoplanets, Stars, Sensors, Polarization, Telescopes, Observational astronomy

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Proceedings Article | 28 August 2024 Poster

Poster

End-to-end public simulation tools for a far-infrared space-based double Fourier interferometer

Locke Spencer, Berke Ricketti, Jeremy Scott, Aláine Lee, Colm Bracken, David Leisawitz, Lee Mundy

Proceedings Volume 13095, 1309535 (2024) https://doi.org/10.1117/12.3020484

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Proceedings Article | 16 August 2024 Poster + Paper

Poster + Paper

The characterisation of a PID feedback-controlled array of TES-bolometers in a far-infrared double-Fourier interferometry testbed

Chris Benson, Jeremy Scott, Locke Spencer, Rashmi Sudiwala, James Cox, Tyrone Jones, Berke Ricketti, David Naylor, Ken Wood, Peter A. Ade

Proceedings Volume 13102, 1310210 (2024) https://doi.org/10.1117/12.3019289

KEYWORDS: Sensors, Detector arrays, Signal to noise ratio, Signal detection, Multiplexing, Superconductors, Superconducting detectors, Spectral response, Modulation, Interference (communication)

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Proceedings Article | 20 October 2023 Presentation + Paper

Presentation + Paper

The science case for a far-infrared interferometer in the era of JWST and ALMA

David Leisawitz, Matteo Bonato, Duncan Farrah, T. Tupper Hyde, Aláine Lee, Joshua Bennett Lovell, Brenda Matthews, Lee Mundy, Conor Nixon, Petr Pokorny, Berke Ricketti, Giorgio Savini, Jeremy Scott, Irene Shivaei, Locke Spencer, Kate Su, C. Megan Urry, David Wilner

Proceedings Volume 12686, 1268609 (2023) https://doi.org/10.1117/12.2682235

KEYWORDS: James Webb Space Telescope, Astronomical interferometers, Galactic astronomy, Spatial resolution, Planets, Telescopes, Spectral resolution, Observatories, Stars, Interferometers

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Proceedings Article | 31 August 2022 Poster + Paper

Poster + Paper

CCAT-prime: optical and cryogenic design of the 850 GHz module for Prime-Cam

Anthony Huber, Scott Chapman, Adrian Sinclair, Locke Spencer, Jason Austermann, Steve Choi, Jesslyn Devina, Patricio Gallardo, Doug Henke, Zachary Huber, Ben Keller, Yaqiong Li, Lawrence Lin, Mike Niemack, Kayla Rossi, Eve Vavagiakis, Jordan Wheeler

Proceedings Volume 12190, 121901D (2022) https://doi.org/10.1117/12.2630370

KEYWORDS: Sensors, Cryogenics, Optical design, Lenses, Attenuators, Monochromatic aberrations, Detector arrays, Silicon, Signal attenuation, Physics

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Proceedings Article | 27 August 2022 Presentation + Paper

Presentation + Paper

Optimization of a cryogenic transition-edge sensor detector array for far-infrared astrophysics

Locke Spencer, Rashmi Sudiwala, Chris Benson, Jeremy Scott, Manimeldura Dinula De Silva, Tyrone Jones, James Cox, Ken Wood, Peter A. Ade

Proceedings Volume 12180, 121802S (2022) https://doi.org/10.1117/12.2630723

KEYWORDS: Sensors, Multiplexing, Signal to noise ratio, Modulation, Signal detection, Detector arrays, Field programmable gate arrays, Space operations, Time division multiplexing, Cryogenics

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Proceedings Article | 12 July 2018 Paper

Paper

Composite material evaluation at cryogenic temperatures for applications in space-based far-infrared astronomical instrumentation

Locke Spencer, Ian Veenendaal, David Naylor, Brad Gom, Geoffrey R. Sitwell, Anthony Huber, Adam Christiansen, Chris Benson, Sudhakar Gunuganti, Martyn Jones, Richard Day, David Walker, Navid Zobeiry, Anoush Poursartip

Proceedings Volume 10706, 107063R (2018) https://doi.org/10.1117/12.2314211

KEYWORDS: Cryogenics, Aluminum, Laser metrology, Metrology, Laser systems engineering, Temperature metrology, Photonics, Fiber lasers, Composites, Astronomical instrumentation

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Proceedings Article | 4 August 2016 Paper

Paper

The path to interferometry in space

S. Rinehart, G. Savini, W. Holland, O. Absil, D. Defrère, L. Spencer, D. Leisawitz, M. Rizzo, R. Juanola-Paramon, D. Mozurkewich

Proceedings Volume 9907, 99070S (2016) https://doi.org/10.1117/12.2231754

KEYWORDS: Telescopes, Far infrared, Interferometry, Space telescopes, Interferometers, Exoplanets, Planets, Spatial resolution, Stars, Astrophysics

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Proceedings Article | 20 July 2016 Paper

Paper

A far-infrared spatial/spectral Fourier interferometry laboratory-based testbed instrument

Locke Spencer, David Naylor, Jeremy Scott, Vince Weiler, Roderick MacCrimmon, Geoffrey Sitwell, Peter Ade

Proceedings Volume 9914, 99141S (2016) https://doi.org/10.1117/12.2233924

KEYWORDS: Interferometry, Spatial resolution, Sensors, Mirrors, Optical alignment, Calibration, Modulation, Spectral resolution, Fourier transforms, Particle swarm optimization

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Proceedings Article | 14 March 2015 Paper

Paper

Optical and quasi-optical analysis of system components for a far-infrared space interferometer

C. Bracken, C. O'Sullivan, A. Donohoe, A. Murphy, G. Savini, R. Juanola-Parramon, Nicola Baccichet, A. Guisseau, P. Ade, E. Pascale, L. Spencer, I. Walker, K. Dohlen, John Lightfoot, W. Holland, Martyn Jones, D. Walker, Alison McMillan

Proceedings Volume 9362, 93620N (2015) https://doi.org/10.1117/12.2076385

KEYWORDS: Mirrors, Telescopes, Space telescopes, Interferometers, Visibility, Beam propagation method, Wavefronts, Interferometry, Monochromatic aberrations, Spatial resolution

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Proceedings Article | 28 August 2014 Paper

Paper

In-orbit performance of the Herschel/SPIRE imaging Fourier transform spectrometer: lessons learned

David Naylor, Jean-Paul Baluteau, George Bendo, Dominique Benielli, Trevor Fulton, Brad Gom, Matthew Griffin, Rosalind Hopwood, Peter Imhof, Tanya Lim, Nanyao Lu, Gibion Makiwa, Nicola Marchili, Glenn Orton, Andreas Papageorgiou, Chris Pearson, Edward Polehampton, Bernhard Schulz, Locke Spencer, Bruce Swinyard, Ivan Valtchanov, Matthijs H. van der Wiel, Ian Veenendaal, Ronin Wu

Proceedings Volume 9143, 91432D (2014) https://doi.org/10.1117/12.2054989

KEYWORDS: Calibration, Bolometers, Spectroscopy, Telescopes, Space telescopes, Fourier transforms, Sensors, Carbon monoxide, Astronomy, Space operations

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Proceedings Article | 2 August 2014 Paper

Paper

Space-based far-infrared interferometry technology development through a laboratory-based spatial/spectral interferometry testbed instrument

Locke Spencer, David Naylor, Giorgio Savini, Peter Ade, Brad Gom

Proceedings Volume 9143, 91434G (2014) https://doi.org/10.1117/12.2055208

KEYWORDS: Interferometry, Interferometers, Spatial resolution, Modulation, Visibility, Astronomy, Space telescopes, Spectral resolution, Fourier transforms, Far infrared

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Proceedings Article | 18 December 2012 Paper

Paper

A space-based Far Infrared Interferometer (FIRI) instrument simulator and test-bed implementation

Roser Juanola-Parramon, Peter Ade, William Grainger, Matt Griffin, Enzo Pascale, Giorgio Savini, Locke Spencer, Bruce Swinyard

Proceedings Volume 8550, 85501Y (2012) https://doi.org/10.1117/12.2014327

KEYWORDS: Interferometers, Fourier transforms, Far infrared, Spatial resolution, Interferometry, Device simulation, Sensors, Mirrors, Spectroscopy, Data processing

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Proceedings Article | 6 August 2010 Paper

Paper

In-orbit performance of the Herschel/SPIRE imaging Fourier transform spectrometer

David Naylor, Jean-Paul Baluteau, Mike Barlow, Dominique Benielli, Marc Ferlet, Trevor Fulton, Matthew Griffin, Timothy Grundy, Peter Imhof, Scott Jones, Ken King, Sarah Leeks, Tanya Lim, Nanyao Lu, Gibion Makiwa, Edward Polehampton, Giorgio Savini, Sunil Sidher, Locke Spencer, Christian Surace, Bruce Swinyard, Roger Wesson

Proceedings Volume 7731, 773116 (2010) https://doi.org/10.1117/12.856299

KEYWORDS: Spectroscopy, Fourier transforms, Sensors, Spectral resolution, Telescopes, Calibration, Detector arrays, Mirrors, Modulation, Interferometers

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Proceedings Article | 12 July 2008 Paper

Paper

Herschel-SPIRE: design, ground test results, and predicted performance

Matt Griffin, Bruce Swinyard, Laurent Vigroux, Alain Abergel, Peter Ade, Philippe André, Jean-Paul Baluteau, James Bock, Alberto Franceschini, Walter Gear, Jason Glenn, Maohai Huang, Douglas Griffin, Ken King, Emmanuel Lellouch, David Naylor, Seb Oliver, Göran Olofsson, Ismael Perez-Fournon, Mat Page, Michael Rowan-Robinson, Paolo Saraceno, Eric Sawyer, Gillian Wright, Annie Zavagno, Asier Abreu, George Bendo, Alan Dowell, Darren Dowell, Marc Ferlet, Trevor Fulton, Peter Hargrave, Glenn Laurent, Sarah Leeks, Tanya Lim, Nanyao Lu, Hien Nguyen, Alan Pearce, Edward Polehampton, Davide Rizzo, Bernhard Schulz, Sunil Sidher, Dave Smith, Locke Spencer, Ivan Valtchanov, Adam Woodcraft, Kevin Xu, Lijun Zhang

Proceedings Volume 7010, 701006 (2008) https://doi.org/10.1117/12.788312

KEYWORDS: Photometry, Fourier transforms, Sensors, Telescopes, Spectroscopy, Mirrors, Space telescopes, Bolometers, Detector arrays, Spectral resolution

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Proceedings Article | 12 July 2008 Paper

Paper

Performance evaluation of the Herschel/SPIRE instrument flight model imaging Fourier transform spectrometer

Locke Spencer, David Naylor, Baoshe Zhang, Peter Davis-Imhof, Trevor Fulton, Jean-Paul Baluteau, Marc Ferlet, Tanya Lim, Edward Polehampton, Bruce Swinyard

Proceedings Volume 7010, 701008 (2008) https://doi.org/10.1117/12.788098

KEYWORDS: Sensors, Fourier transforms, Spectroscopy, Spectral resolution, Instrument modeling, Performance modeling, Vignetting, Beam splitters, Calibration, Detector arrays

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Proceedings Article | 6 July 2006 Paper

Paper

Preliminary results from Herschel-SPIRE flight instrument testing

Tanya Lim, Bruce Swinyard, Matthew Griffin, Asier Aramburu, Jean-Paul Baluteau, James Bock, Marc Ferlet, Trevor Fulton, Douglas Griffin, Steven Guest, Peter Hargrave, Kenneth King, Sarah Leeks, David Naylor, Edward Polehampton, Davide Rizzo, Eric Sawyer, Bernhard Schulz, Sunil Sidher, Locke Spencer, David Smith, Hien Trong Nguyen, Ivan Valtchanov, Tim Waskett, Adam Woodcraft

Proceedings Volume 6265, 62650F (2006) https://doi.org/10.1117/12.672752

KEYWORDS: Spectroscopy, Photometry, Sensors, Black bodies, Bolometers, Telescopes, Calibration, Fourier transforms, Device simulation, Electronics

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Proceedings Article | 15 June 2006 Paper

Paper

A comparison of the theoretical and measured performance of the Herschel/SPIRE imaging Fourier transform spectrometer

Locke Spencer, David Naylor, Bruce Swinyard

Proceedings Volume 6265, 62652Z (2006) https://doi.org/10.1117/12.671565

KEYWORDS: Spectroscopy, Fourier transforms, Sensors, Molecular lasers, Spectral resolution, Imaging spectroscopy, Instrument modeling, Signal to noise ratio, Spectroscopes, Aerospace engineering

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Proceedings Article | 15 October 2004 Paper

Paper

Data processing pipeline for a time-sampled imaging Fourier transform spectrometer

David Naylor, Trevor Fulton, Peter Davis, Ian Chapman, Brad Gom, Locke Spencer, John Lindner, Nathan Nelson-Fitzpatrick, Margaret Tahic, Gary Davis

Proceedings Volume 5546, (2004) https://doi.org/10.1117/12.560096

KEYWORDS: Fourier transforms, Spectroscopy, Sensors, Imaging systems, Staring arrays, Error analysis, Data processing, Spectral resolution, Mirrors, Signal detection

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Proceedings Article | 12 October 2004 Paper

Paper

A Fourier transform spectrometer for ground testing of the Herschel/SPIRE instrument

Locke Spencer, David Naylor, Bruce Swinyard, Asier Aramburu, Trevor Fulton, Tanya Lim, Samuel Ronayette, Ian Schofield

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.551784

KEYWORDS: Black bodies, Spectroscopy, Telescopes, Mirrors, Space telescopes, Device simulation, Fourier transforms, Sensors, Humidity, Spectral resolution

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Proceedings Article | 12 October 2004 Paper

Paper

First results from Herschel-SPIRE performance tests

Tanya Lim, Bruce Swinyard, Asier Aramburu, James Bock, Marc Ferlet, Douglas Griffin, Matthew Griffin, Peter Hargrave, Kenneth King, Sarah Leeks, David Naylor, Samuel Ronayette, Eric Sawyer, Bernhard Schulz, Sunil Sidher, Locke Spencer, David Smith, Adam Woodcraft

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.551684

KEYWORDS: Sensors, Bolometers, Telescopes, Device simulation, Black bodies, Cryogenics, Optical testing, Mirrors, Photometry, Temperature metrology

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Showing 5 of 23 publications

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