Dr. Paul W. Fairchild Profile

Dr. Paul W. Fairchild

Senior Scientist at Trex Enterprises Corp

SPIE Involvement:

Author

Proceedings Article | 26 August 2008 Paper

Laboratory demonstration of a multiple beam Fourier telescopy imaging system

E. Louise Cuellar, Justin Cooper, James Mathis, Paul Fairchild

Proceedings Volume 7094, 70940G (2008) https://doi.org/10.1117/12.798533

KEYWORDS: Signal to noise ratio, Fourier transforms, Reconstruction algorithms, Sensors, Spatial frequencies, Satellites, Modulation, Image restoration, Satellite imaging, Imaging systems

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Proceedings Article | 30 August 2005 Paper

Field experiment performance of the receiver elements for a Fourier telescopy imaging system

J. Mathis, J. Stapp, E. Cuellar, J. Cooper, A. Morris, P. Fairchild, Dane Hult, Katrina Koski, Lee Ramzel, Marcia Thornton

Proceedings Volume 5896, 58960F (2005) https://doi.org/10.1117/12.639802

KEYWORDS: Mirrors, Receivers, Transmitters, Fourier transforms, Signal to noise ratio, Imaging systems, Sensors, Satellites, Satellite imaging, Wavefronts

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Fourier telescopy (FT) is an active imaging technique that is a candidate for high resolution imaging systems which can be used to obtain satellite images out to geosynchronous target ranges. Fourier telescopy uses multiple beams that illuminate the target with a fringe pattern that sweeps across it due to a set frequency difference between beams. In this way the target spatial frequency components are encoded in the temporal signal that is reflected from the target. The FT receiver can then be composed of a large area "light bucket" collector, since only the integrated temporal signal is necessary to reconstruct the target image. The GEO Light Imaging National Testbed (GLINT) system was previously designed to obtain satellite images at geosynchronous ranges by using this technique. The "light bucket" receiver was designed use forty heliostats, each having a collection area of ten meters square, and composed of a 16 x 16 grid of two foot square mirrors. The heliostats would redirect the return light from the target onto a large spherical concentrator array composed of hexagonal mirror segments. This concentrator would then focus the return light onto a photomultiplier tube (PMT) detector. The FT Field experiment presented in this paper uses one 10-meter square heliostat and a single PMT, plus a scaled down secondary array to provide the optical elements of the receiver for the FT field experiment. In this paper, we will describe the performance characteristics of the heliostat, secondary, and PMT detector. Performance characteristics include optical wavefront, alignment, and alignment stability of the optical elements. Finally, results will be presented after the receiver was integrated with a transmitter system that provided the modulated FT signal from various targets. Image reconstructions will show that even using low quality "Light bucket" receiver optics and a 1.5 km horizontal path through the atmosphere, the modulated signal can still produce good image quality of the targets. Image reconstruction will also be presented for different SNR values in the received signal.

Proceedings Article | 13 September 2004 Paper

High-speed multiple object passive and active electro-optical tracking

Jack Daugherty, Paul Fairchild, Victor Hasson, Howard Hyman, Daniel Leslie

Proceedings Volume 5412, (2004) https://doi.org/10.1117/12.564921

KEYWORDS: Sensors, Target detection, Cameras, Electro optics, Signal to noise ratio, Mid-IR, Rockets, Artillery, Surveillance, Mirrors

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Proceedings Article | 27 December 2001 Paper

Measurements of geosynchronous-satellite spectral brightness due to solar illumination

Lawrence Sverdrup, Donald Bruns, Timothy Brinkley, Allen Olson, Jerry Oldenettel, Paul Fairchild

Proceedings Volume 4490, (2001) https://doi.org/10.1117/12.455427

KEYWORDS: Satellites, Stars, Calibration, Visualization, Telescopes, Charge-coupled devices, Sun, Earth's atmosphere, Satellite imaging, Optical filters

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Proceedings Article | 13 May 1998 Paper

Dependence of light transmission through human skin on incident beam diameter at different wavelengths

ZhongQuan Zhao, Paul Fairchild

Proceedings Volume 3254, (1998) https://doi.org/10.1117/12.308184

KEYWORDS: In vivo imaging, Ear, Photon transport, Laser scattering, Sensors, Scattering, Transmittance, Tissue optics, Tissues, Skin

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Proceedings Article | 14 November 1996 Paper

Sheared-beam coherent image reconstruction

Steven Stahl, Richard Kremer, Paul Fairchild, Kevin Hughes, Brett Spivey, Robert Stagat

Proceedings Volume 2847, (1996) https://doi.org/10.1117/12.258219

KEYWORDS: Turbulence, Receivers, Image restoration, Signal to noise ratio, Sensors, Beam splitters, Modulation, Fourier transforms, Speckle, Atmospheric turbulence

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Showing 5 of 6 publications

Conference Committee Involvement (4)

Unconventional Imaging IV

11 August 2008 | San Diego, California, United States

Unconventional Imaging III

26 August 2007 | San Diego, California, United States

Unconventional Imaging II

13 August 2006 | San Diego, California, United States

Unconventional Imaging

31 July 2005 | San Diego, California, United States

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