Dr. Gordon G. Shepherd Profile

Dr. Gordon G. Shepherd

Professor at York Univ

SPIE Involvement:

Author

Publications (16)

Proceedings Article | 12 July 2019 Open Access

Open Access

Paper

Optical design and performance analysis of a CubeSat-sized limb sounder utilizing a spatial heterodyne spectrometer for the measurement of mesospheric temperature

Martin Kaufmann, Friedhelm Olschewski, Klaus Mantel, Oliver Wroblowski, Jilin Liu, Michael Deiml, Qiuyu Chen, Ulrike Lembke, Saroj Mihalik, Brian Solheim, Gordon Shepherd, Ralf Koppmann, Martin Riese

Proceedings Volume 11180, 111803P (2019) https://doi.org/10.1117/12.2536052

KEYWORDS: Sensors, Spectroscopy, Temperature metrology, Heterodyning, Point spread functions, Spatial frequencies, Optical design, Spectral resolution, Diffraction gratings, Fourier transforms

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SPIE Journal Paper | 13 June 2014 Open Access

Open Access

Neurophotonics applications to motor cortex research: a review

Benjamin Suter, Naoki Yamawaki, Katharine Borges, Xiaojian Li, Taro Kiritani, Bryan Hooks, Gordon Shepherd

NPh, Vol. 1, Issue 01, 011008, (June 2014) https://doi.org/10.1117/12.10.1117/1.NPh.1.1.011008

KEYWORDS: Neurons, Neurophotonics, Brain mapping, In vivo imaging, Optogenetics, Calcium, Photostimulation, Axons, Brain, Two photon excitation microscopy

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Proceedings Article | 1 November 2005 Paper

Paper

Aurora and diurnal tides in the daytime O(¹S) emission rates from WINDII/UARS measurements

Shengpan Zhang, Gordon Shepherd

Proceedings Volume 5979, 597911 (2005) https://doi.org/10.1117/12.627145

KEYWORDS: Auroras, Satellites, Astatine, Databases, Atmospheric modeling, Airglow, Interferometers, Atmospheric sciences, Satellite imaging, Thermosphere

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Proceedings Article | 1 November 2005 Paper

Paper

On the response of the atomic oxygen red line emission rates to the Sun's energy input: an empirical model deduced from WINDII/UARS global measurements

Shengpan Zhang, Gordon Shepherd

Proceedings Volume 5979, 597912 (2005) https://doi.org/10.1117/12.627150

KEYWORDS: Solar energy, Atmospheric modeling, Airglow, Satellites, Oxygen, Sun, Databases, Satellite imaging, Thermosphere, Data modeling

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In a previous paper by Zhang and Shepherd, an empirical model for the peak volume emission rate (V_p) and the integrated volume emission rate of the O(¹D) (630 nm) dayglow was deduced from more than 130,000 daytime emission rate profiles observed by the Wind Imaging Interferometer (WINDII) on the Upper Atmospheric Research Satellite (UARS) during 1991-1995. In the model, the emission rates are given as functions of the solar zenith angle (χ) and solar irradiance using the F10.7 cm flux as a proxy. This paper extends the daytime empirical model into the twilight zone and includes the height of the peak emission rate and the width of the emission layer. For a given day, the O(¹D) emission layer during both daytime and twilight-time is found to be sensitive to the solar zenith angle when solar irradiance is treated as a constant. Positive linear relationships are found between the daytime emission rate and cos^1/eχ at χ < 87° the twilight-time emission rate and cos(χ+0.25)^1.8 at 87° less than or equal to χ less than or equal to 104.5°, and the width of the emission layer and cosχ at χ < 87°. A negative linear relationship is found between the peak emission rate and its height at χ < 104.5°. In the long-term, the emission layer varies according to the solar cycle in that both the emission rate and the height of the emission layer increase with increasing solar irradiance. The empirical model provides the peak volume emission rate and its height, and the integrated emission rate, for both daytime and twilight zones, and the width of the daytime emission layer as functions of the solar zenith angle and solar irradiance using F10.7, E10.7, and Lyman-β as proxies. The profiles of the volume emission rate and global morphology of the red line emission therefore can be constructed using the model. Effects of solar storms, and physical precesses and photochemical reactions other than that due to the direct solar energy deposition in the thermosphere can be derived by comparing to the model.

Proceedings Article | 30 November 2004 Paper

Paper

Remote sensing of the large-scale circulation of atomic oxygen

Gordon Shepherd, Guiping Liu, Raymond Roble

Proceedings Volume 5571, (2004) https://doi.org/10.1117/12.567886

KEYWORDS: Oxygen, Airglow, Remote sensing, Data modeling, Satellites, Climatology, Atmospheric modeling, Observatories, Atmospheric sciences, Atmospheric sensing

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Proceedings Article | 17 February 2003 Paper

Paper

Imaging interferometer for satellite observations of wind and temperature on Mars, the Dynamics Atmosphere Mars Observer (DYNAMO)

William Ward, William Gault, Neil Rowlands, Shiguang Wang, Gordon Shepherd, Ian McDade, Jack McConnell, D Michelangeli, John Caldwell

Proceedings Volume 4833, (2003) https://doi.org/10.1117/12.473823

KEYWORDS: Mars, Space operations, Sensors, Mirrors, Interferometers, Doppler effect, Airglow, Wind measurement, Temperature metrology, Mirror pointing

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Proceedings Article | 12 December 2001 Paper

Paper

SWIFT: an infrared Doppler Michelson interferometer for measuring stratospheric winds

William Gault, Ian McDade, Gordon Shepherd, Reza Mani, Stephen Brown, Phil Gregory, Alan Scott, Yves Rochon, Wayne Evans

Proceedings Volume 4540, (2001) https://doi.org/10.1117/12.450694

KEYWORDS: Michelson interferometers, Fabry–Perot interferometers, Doppler effect, Germanium, Wind measurement, Satellites, Calibration, Infrared radiation, Mid-IR, Semiconducting wafers

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Proceedings Article | 12 December 2001 Paper

Paper

Waves Michelson Interferometer: a visible/near-IR interferometer for observing middle atmosphere dynamics and constituents

William Ward, William Gault, Gordon Shepherd, Neil Rowlands

Proceedings Volume 4540, (2001) https://doi.org/10.1117/12.450652

KEYWORDS: Mirrors, Sensors, Temperature metrology, Oxygen, Michelson interferometers, Interferometers, Thermosphere, Calibration, Space telescopes, Space operations

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Proceedings Article | 31 October 1996 Paper

Paper

Satellite instrument to measure stratospheric winds

Neil Rowlands, Gary Buttner, A. Raab, Gordon Shepherd, William Gault, Mark Cann, S. Dobbie, Stoyan Sargoytchev, William Ward, Reza Mani, Yves Rochon, David Tarasick

Proceedings Volume 2830, (1996) https://doi.org/10.1117/12.256103

KEYWORDS: Sensors, Data modeling, Visibility, Fabry–Perot interferometers, Satellites, Atmospheric modeling, Wind measurement, Interferometers, Optical filters, Signal to noise ratio

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Proceedings Article | 31 October 1996 Paper

Paper

Divided-mirror scanning technique for a small Michelson interferometer

William Gault, Stoyan Sargoytchev, Gordon Shepherd

Proceedings Volume 2830, (1996) https://doi.org/10.1117/12.256111

KEYWORDS: Mirrors, Michelson interferometers, Doppler effect, Visibility, Interferometers, Telescopes, Calibration, Sensors, Imaging systems, Detector arrays

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Proceedings Article | 31 October 1996 Paper

Paper

Spectral Airglow Temperature Imager

Rudolph Wiens, Stephen Brown, Stoyan Sargoytchev, R. Peterson, William Gault, Gordon Shepherd, Adrian Moise, Tyler Ivanco, George Fazekas

Proceedings Volume 2830, (1996) https://doi.org/10.1117/12.256136

KEYWORDS: Imaging systems, Airglow, Interference filters, Digital signal processing, Temperature metrology, Charge-coupled devices, Filtering (signal processing), Satellites, Oxygen, Cryogenics

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Proceedings Article | 30 September 1994 Paper

Paper

On-orbit performance of the WINDII instrument on the Upper Atmosphere Research Satellite (UARS)

William Gault, Gordon Shepherd, William Ward, Charles Hersom, Yves Rochon, Brian Solheim

Proceedings Volume 2266, (1994) https://doi.org/10.1117/12.187567

KEYWORDS: Calibration, Lamps, Satellites, Charge-coupled devices, Interferometers, Airglow, Michelson interferometers, Mirrors, CCD image sensors, Sensors

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Proceedings Article | 30 September 1994 Paper

Paper

O2 atmospheric band measurements with WINDII: performance of a narrow-band filter/wide-angle Michelson combination in space

William Ward, William Gault, Gordon Shepherd, Charles Hersom, C. Tai, Brian Solheim

Proceedings Volume 2266, (1994) https://doi.org/10.1117/12.187568

KEYWORDS: Calibration, Sensors, Ultraviolet radiation, Atmospheric modeling, Stars, Earth's atmosphere, Optical filters, Instrument modeling, Stratosphere, Interferometers

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Proceedings Article | 31 January 1994 Paper

Paper

Imaging atmospheric winds and temperatures with optical Doppler Michelson interferometry: high-resolution spectroscopy at small optical retardations

Gordon Shepherd

Proceedings Volume 2089, (1994) https://doi.org/10.1117/12.166618

KEYWORDS: Atmospheric optics, Doppler effect, Michelson interferometers, Glasses, Oxygen, Mirrors, Interferometry, Spectroscopy, Interferometers, Temperature metrology

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Proceedings Article | 12 February 1993 Paper

Paper

Design and on-orbit performance of the WINDII baffle system

William Gault, Jean-Francis Brun, Mary Desaulniers, Douglas Miller, Frederick Pasternak, Yves Rochon, J. Rupil, Gordon Shepherd

Proceedings Volume 1753, (1993) https://doi.org/10.1117/12.140701

KEYWORDS: Signal attenuation, Clouds, Optical filters, Information operations, Doppler effect, Airglow, Space operations, Michelson interferometers, Satellite imaging, Satellites

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Proceedings Article | 29 June 1992 Paper

Paper

WIND Imaging Interferometer (WINDII) on the upper-atmosphere research satellite

William Gault, Gordon Shepherd, Gerard Thuillier, Brian Solheim, Charles Hersom, Jean-Francis Brun, Susan Brune, J. Gore

Proceedings Volume 1745, (1992) https://doi.org/10.1117/12.60599

KEYWORDS: Interferometers, Wind measurement, Sensors, Charge-coupled devices, Satellites, Mirrors, Calibration, Satellite imaging, Michelson interferometers, Aluminum

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Showing 5 of 16 publications

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