Dr. Ryan E. Warburton Profile

Dr. Ryan E. Warburton

at Photon Force Ltd

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Publications (9)

Proceedings Article | 27 January 2017 Presentation

Towards real-time tracking of hidden objects in real-life scenarios (Conference Presentation)

Susan Chan, Ryan Warburton, Genevieve Gariepy, Yoann Altmann, Steve McLaughlin, Jonathan Leach, Daniele Faccio

Proceedings Volume 9992, 99920P (2017) https://doi.org/10.1117/12.2241094

KEYWORDS: Wavefronts, Sensors, Data hiding, Avalanche photodiodes, Picosecond phenomena, Imaging systems, Cameras, Single photon detectors, Pulsed laser operation, Spherical lenses

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Advances in LIDAR-based methods have enabled the detection and reconstruction of images of static objects hidden from the direct line-of-sight [1, 2]. One of the drawbacks to the technology used in these demonstrations is the requirement for long acquisition times. More recently, Gariepy et al. have shown that it is possible to detect and track a moving hidden object, albeit with no information of the object’s form [3]. Applications of this include, but are not limited to, search and rescue, and hazard detection. We present a real-time tracking system that enables the detection of moving objects that are outside the direct line-of-sight. Our active imaging system is a single-pixel variant of the technology reported by Gariepy et al. It replaces the single-photon avalanche diode (SPAD) camera of 1024 pixels with a number of SPAD detectors to detect light back-scattered from the hidden object. The flexibility of the single-pixel detectors provides an increased field of view, allowing us to detect and simultaneously track with better precision with respect to a SPAD array. The use of single-pixel detectors also has the advantage of a high detection efficiency. We perform two proof-of-concept experiments using three pixels and a single pulsed laser to interrogate a “room” for a hidden object. In the first experiment, we demonstrate that we can accurately locate the position of a hidden object. In the second experiment, we use the same system and demonstrate that we can accurately track the motion of a hidden object in real time. The “room” is a purpose-built box measuring 102×102×77 cm. Optical access is provided by a 28×12 cm window. The target object is a 15×15 cm textured viewing screen that we move along a designated ground track outside the line-of- sight of our system. In our experiments, we send a train of light pulses through the window to the back of the room. The pulses scatter off the wall as a spherical wavefront that propagates in all directions. Some of this light reaches our hidden object and is scattered back again towards the rear wall where we image our three SPAD pixels. The SPAD detectors are capable of picosecond temporal resolutions. Our time-correlated single-photon counting system measures the photon arrival times (64 ps resolution) for the signal returning to each detector. A histogram is built up in one second of acquisition time over 80 million pulses. We use this temporal information in our target position retrieval of the hidden object. We place the object at 11 positions in turn in a seven minute experiment, and localise its position. We then perform real-time tracking and move the object around the hidden scene for approximately one minute, processing the target position retrieval every 1.5 s.

Proceedings Article | 25 October 2016 Presentation + Paper

Picosecond time-resolved imaging using SPAD cameras

Genevieve Gariepy, Jonathan Leach, Ryan Warburton, Susan Chan, Robert Henderson, Daniele Faccio

Proceedings Volume 9992, 99920N (2016) https://doi.org/10.1117/12.2241184

KEYWORDS: Laser beam propagation, Picosecond phenomena, Cameras, Sensors, Signal detection, Laser scattering, Light scattering, Scattering, Mirrors, Imaging systems

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Proceedings Article | 17 May 2016 Paper

Time-resolved non-sequential ray-tracing modelling of non-line-of-sight picosecond pulse LIDAR

Adam Sroka, Susan Chan, Ryan Warburton, Genevieve Gariepy, Robert Henderson, Jonathan Leach, Daniele Faccio, Stephen Lee

Proceedings Volume 9822, 98220L (2016) https://doi.org/10.1117/12.2223589

KEYWORDS: 3D modeling, Picosecond phenomena, Modeling, Pulsed laser operation, Target detection, Sensors, Laser scattering, Photons, Scattering, Data modeling

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Proceedings Article | 13 May 2015 Paper

Underwater depth imaging using time-correlated single photon counting

Aurora Maccarone, Aongus McCarthy, Ximing Ren, Ryan Warburton, Andy Wallace, James Moffat, Yvan Petillot, Gerald Buller

Proceedings Volume 9492, 94920I (2015) https://doi.org/10.1117/12.2176959

KEYWORDS: Signal attenuation, Imaging systems, Scattering, Transmittance, Sensors, Ocean optics, Transceivers, Target detection, Underwater imaging, Target acquisition

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Proceedings Article | 6 May 2015 Paper

Enhancing the fill-factor of CMOS SPAD arrays using microlens integration

G. Intermite, R. Warburton, A. McCarthy, X. Ren, F. Villa, A. Waddie, M. Taghizadeh, Y. Zou, Franco Zappa, Alberto Tosi, Gerald Buller

Proceedings Volume 9504, 95040J (2015) https://doi.org/10.1117/12.2178950

KEYWORDS: Microlens, Microlens array, Sensors, Silicon, Photodetectors, Quenching (fluorescence), Imaging systems, CMOS technology, CMOS sensors, Avalanche photodiodes

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Proceedings Article | 19 November 2012 Paper

High-dimensional spatial entanglement observed with an electron multiplying CCD camera

Daniel Tasca, Matthew Edgar, Frauke Izdebski, Ryan Warburton, Jonathan Leach, Megan Agnew, Gerald Buller, Robert Boyd, Miles Padgett

Proceedings Volume 8542, 85421T (2012) https://doi.org/10.1117/12.981414

KEYWORDS: Cameras, Electron multiplying charge coupled devices, Crystals, Photonic crystals, CCD cameras, Single photon, Imaging systems, Correlation function, Photodetectors, Quantum information

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Proceedings Article | 11 February 2012 Paper

Quantum correlations in position, momentum and intermediate bases, measured using fiber arrays

F. Izdebski, J. Leach, R. Warburton, D. G. Ireland, S. Barnett, A. Yao, G. Buller, M. Padgett

Proceedings Volume 8274, 82740E (2012) https://doi.org/10.1117/12.912055

KEYWORDS: Sensors, Crystals, Spatial light modulators, Single photon, Laser crystals, Avalanche photodiodes, Detector arrays, Photodetectors, Time metrology, Image sensors

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Proceedings Article | 24 January 2011 Paper

Single-photon detection in time-of-flight-depth imaging and quantum key distribution

Gerald Buller, Robert Collins, Patrick Clarke, Nils Krichel, Aongus McCarthy, Ryan Warburton, Frauke Izdebski, Robert Hadfield

Proceedings Volume 7945, 79452M (2011) https://doi.org/10.1117/12.873808

KEYWORDS: Sensors, Quantum key distribution, Single photon detectors, Quantum communications, Optical fibers, Silicon, Information security, Avalanche photodiodes, Ranging, Data acquisition

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Proceedings Article | 29 April 2010 Paper

A superconducting nanowire single-photon detector system for single-photon source characterization

C. Fitzpatrick, C. Natarajan, R. Warburton, G. Buller, B. Baek, S. Nam, S. Miki, Z. Wang, M. Sasaki, A. Sinclair, R. Hadfield

Proceedings Volume 7681, 76810H (2010) https://doi.org/10.1117/12.851892

KEYWORDS: Sensors, Picosecond phenomena, Single photon detectors, Photons, Superconductors, Signal to noise ratio, Quantum dots, Indium gallium arsenide, Single photon, Nanowires

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Showing 5 of 9 publications

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