Dr. Ian P. Powell Profile

Dr. Ian P. Powell

Senior Research Officer at National Research Council Canada

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Author

Publications (16)

Proceedings Article | 20 July 2006 Paper

Performance comparison of an anamorphic spatial heterodyne spectrometer with conventional spectrometer

Ian Powell, Pavel Cheben

Proceedings Volume 6342, 63422C (2006) https://doi.org/10.1117/12.692225

KEYWORDS: Spectroscopy, Heterodyning, Spectral resolution, Sensors, Interferometers, Charge-coupled devices, Fourier transforms, Diffraction gratings, Performance modeling, Collimators

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Proceedings Article | 27 June 2006 Paper

A conceptual design for the Thirty Meter Telescope adaptive optics systems

B. Ellerbroek, C. Boyer, C. Bradley, M. Britton, S. Browne, R. Buchroeder, J.-L. Carel, M. Cho, M. Chun, R. Clare, R. Conan, L. Daggert, R. Dekany, J. Elias, D. Erickson, R. Flicker, D. Gavel, L. Gilles, P. Hampton, G. Herriot, M. Hunten, R. Joyce, M. Liang, B. Macintosh, R. Palomo, I. Powell, S. Roberts, E. Ruch, J.-C. Sinquin, M. Smith, J. Stoesz, M. Troy, G. Tyler, J.-P. Veran, C. Vogel, Q. Yang

Proceedings Volume 6272, 62720D (2006) https://doi.org/10.1117/12.669422

KEYWORDS: Adaptive optics, Telescopes, Mirrors, Laser guide stars, Wavefronts, Wavefront sensors, Stars, Control systems, Imaging spectroscopy, Imaging systems

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Proceedings Article | 27 June 2006 Paper

NFIRAOS: TMT narrow field near-infrared facility adaptive optics

Glen Herriot, Paul Hickson, B. Ellerbroek, D. Andersen, T. Davidge, D. Erickson, I. Powell, R. Clare, L. Gilles, C. Boyer, M. Smith, L. Saddlemyer, J.-P. Véran

Proceedings Volume 6272, 62720Q (2006) https://doi.org/10.1117/12.672337

KEYWORDS: Adaptive optics, Telescopes, Mirrors, Sodium, Deformable mirrors, Actuators, Sensors, Stars, Laser guide stars, Thirty Meter Telescope

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Proceedings Article | 25 August 2005 Paper

NFIRAOS: TMT facility adaptive optics with conventional DMs

Glen Herriot, Paul Hickson, B. Ellerbroek, David Andersen, T. Davidge, D. Erickson, I. Powell, R. Clare, M. Smith, L. Saddlemyer, J.-P. Veran

Proceedings Volume 5903, 590302 (2005) https://doi.org/10.1117/12.617849

KEYWORDS: Adaptive optics, Telescopes, Mirrors, Control systems, Actuators, Deformable mirrors, Sensors, Laser guide stars, Stars, Thirty Meter Telescope

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Although many of the instruments planned for the TMT (Thirty Meter Telescope) have their own closely-coupled adaptive optics systems, TMT will also have a facility Adaptive Optics (AO) system feeding three instruments on the Nasmyth platform. For this Narrow-Field Infrared Adaptive Optics System, NFIRAOS (pronounced nefarious), the TMT project considered two architectures. One, described in this paper, employs conventional deformable mirrors with large diameters of about 300 mm and this is the reference design adopted by the TMT project. An alternative design based on MEMS was also studied, and is being presented separately in this conference. The requirements for NFIRAOS include 0.8-5 microns wavelength range, 30 arcsecond diameter output field of view (FOV), excellent sky coverage, and diffraction- limited atmospheric turbulence compensation (specified at 133 nm RMS including residual telescope and science instrument errors.) The reference design for NFIRAOS includes multiple sodium laser guide stars over a 70 arcsecond FOV, and an infrared tip/tilt/focus/astigmatism natural guide star sensor within instruments. Larger telescopes require greater deformable mirror (DM) stroke. Although initially NFIRAOS will correct a 10 arcsecond science field, it uses two deformable mirrors in series, partly to provide sufficient stroke for atmospheric correction over the 30 m telescope aperture, but mainly to partially correct a 2 arcminute diameter "technical" field to sharpen near-IR natural guide stars and improve sky coverage. The planned upgrade to full performance includes replacing the groundconjugated DM with a higher actuator density, and using a deformable telescope secondary mirror as a "woofer." NFIRAOS incorporates an instrument rotator and selection of three live instruments: a near-Infrared integral field Imaging spectrograph, a near-infrared echelle spectrograph, and after upgrading NFIRAOS to full multi-conjugation, a wide field (30 arcsecond) infrared camera.

Proceedings Article | 30 September 2004 Paper

A Canadian wide-field optical spectrograph for a 30-m telescope

Bev Oke, Denis Laurin, Ian Powell, David Crampton, John Pazder, Kei Szeto, Marc Baril, Leslie Saddlemyer, James Stilburn, Scott Roberts

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.552436

KEYWORDS: Telescopes, Cameras, Relays, Spectrographs, Space telescopes, Collimators, Mirrors, Diffraction gratings, Charge-coupled devices, Lenses

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Proceedings Article | 7 June 2001 Paper

Zoom ophthalmoscope

George Smith, John Farmer, Ian Powell

Proceedings Volume 4245, (2001) https://doi.org/10.1117/12.429272

KEYWORDS: Zoom lenses, Retina, Eye, Lenses, Objectives, Image quality, Telescopes, Prototyping, Cameras, Diagnostics

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Proceedings Article | 27 August 1999 Paper

Cable length measuring device

Ian Powell

Proceedings Volume 3737, (1999) https://doi.org/10.1117/12.360022

KEYWORDS: Sensors, Signal detection, Measurement devices, Beam delivery, Signal processing, Diffraction, Optical components, Prisms, Collimators, Aspheric lenses

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SPIE Journal Paper | 1 October 1997

High-resolution short-wave infrared spectrograph optics

Ian Powell

OE, Vol. 36, Issue 10, (October 1997) https://doi.org/10.1117/12.10.1117/1.601513

KEYWORDS: Spectrographs, Short wave infrared radiation, Cameras, Antireflective coatings, Infrared spectroscopy, Objectives, Infrared radiation, Diffraction gratings, Sensors, Spectral resolution

SPIE Journal Paper | 1 January 1997

Technique employed in the development of anti-vignetting filters

Ian Powell

OE, Vol. 36, Issue 01, (January 1997) https://doi.org/10.1117/12.10.1117/1.601169

KEYWORDS: Optical filters, Image filtering, Vignetting, Cameras, Objectives, Sensors, Optical engineering, Coating, Control systems, Image transmission

Proceedings Article | 13 November 1996 Paper

SFSI: the CCRS SWIR imaging spectrometer

Robert Neville, R. Marois, Neil Rowlands, Ian Powell

Proceedings Volume 2819, (1996) https://doi.org/10.1117/12.258084

KEYWORDS: Sensors, Signal to noise ratio, Short wave infrared radiation, Spectrographs, Spectroscopy, Calibration, Data acquisition, Minerals, Detector arrays, Spectral resolution

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Proceedings Article | 23 August 1996 Paper

Antivignetting filter design

Ian Powell

Proceedings Volume 2774, (1996) https://doi.org/10.1117/12.246681

KEYWORDS: Optical filters, Image filtering, Cameras, Image transmission, Vignetting, Objectives, Optical components, Roads, Geometrical optics, Edge roughness

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Proceedings Article | 17 October 1994 Paper

Short-wave infrared (SWIR) imaging spectrometer for remote sensing

Neil Rowlands, Robert Neville, Ian Powell

Proceedings Volume 2269, (1994) https://doi.org/10.1117/12.188640

KEYWORDS: Sensors, Short wave infrared radiation, Calibration, Spectrographs, Spectroscopy, Detector arrays, Infrared spectroscopy, Cameras, Infrared technology, Quantum efficiency

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SPIE Journal Paper | 1 May 1994

Software development for design of illumination systems

Ian Powell, Amanda Bewsher

OE, Vol. 33, Issue 05, (May 1994) https://doi.org/10.1117/12.10.1117/12.168540

KEYWORDS: Reflectors, Systems modeling, Ray tracing, Aspheric lenses, Optical design, Spherical lenses, Optical spheres, Software development, Chemical elements, Fluctuations and noise

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SPIE Journal Paper | 1 December 1993

Near-ultraviolet limb imaging spectrograph for sounding rockets

Frank Harris, Richard Gattinger, Ian Powell, Ian McDade, Edward Llewellyn, John Yuen, Peter Moorhouse, Supriya Chakrabarti, William Sharp

OE, Vol. 32, Issue 12, (December 1993) https://doi.org/10.1117/12.10.1117/12.149179

KEYWORDS: Nanoimprint lithography, Airglow, Charge-coupled devices, Rockets, Spectrographs, Gemini Observatory, Imaging systems, Sensors, Spectroscopy, Image resolution

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Proceedings Article | 10 August 1993 Paper

Software development for design of illuminator systems

Ian Powell, Amanda Bewsher

Proceedings Volume 1970, (1993) https://doi.org/10.1117/12.155835

KEYWORDS: Reflectors, Ray tracing, Aspheric lenses, Systems modeling, Optical design, Spherical lenses, Optical spheres, Software development, Modeling, Fiber optic illuminators

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Proceedings Article | 29 June 1992 Paper

Visible airglow limb imaging spectrograph for sounding rockets

Frank Harris, Richard Gattinger, Ian McDade, Ian Powell, Edward Llewellyn, John Yuen, Peter Moorhouse, Supriya Chakrabarti

Proceedings Volume 1745, (1992) https://doi.org/10.1117/12.60617

KEYWORDS: Nanoimprint lithography, Airglow, Charge-coupled devices, Rockets, Gemini Observatory, Imaging systems, Sensors, Spectrographs, Image resolution, Oxygen

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Showing 5 of 16 publications

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