Mr. James L. Stapp Profile

James L. Stapp

at Trex Enterprises Corp

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Author

Publications (7)

Proceedings Article | 8 September 2006 Paper

Phase closure and object reconstruction algorithm for Fourier telescopy applied to fast-moving targets

Brett Spivey, James Stapp, David Sandler

Proceedings Volume 6307, 630702 (2006) https://doi.org/10.1117/12.682179

KEYWORDS: Reconstruction algorithms, Transmitters, Spatial frequencies, Fourier transforms, Signal to noise ratio, Algorithm development, Telescopes, Phase shifts, Receivers, Image restoration

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Proceedings Article | 7 September 2006 Paper

Simulation of a Fourier telescopy imaging system for objects in low Earth orbit

James Stapp, Brett Spivey, Laurence Chen, Lisandro Leon, Kevin Hughes, Dave Sandler, E. Louis Cuellar

Proceedings Volume 6307, 630701 (2006) https://doi.org/10.1117/12.676284

KEYWORDS: Transmitters, Receivers, Sensors, Speckle, Telescopes, Atmospheric modeling, Imaging systems, Space telescopes, Signal detection, Spatial frequencies

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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 | 23 August 2005 Paper

Laboratory and field experimental demonstration of a Fourier telescopy imaging system

E. Cuellar, James Stapp, Justin Cooper

Proceedings Volume 5896, 58960D (2005) https://doi.org/10.1117/12.615444

KEYWORDS: Signal to noise ratio, Fourier transforms, Imaging systems, Satellites, Satellite imaging, Spatial frequencies, Receivers, Transmitters, Modulation transfer functions, Image restoration

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Proceedings Article | 13 November 1998 Paper

Liquid-cooled transmissive optical component

Mark Culpepper, James Metz, James Stapp

Proceedings Volume 3447, (1998) https://doi.org/10.1117/12.331129

KEYWORDS: Absorption, Liquids, Silica, Hydrogen, Adhesives, Optical components, Water, Carbon, Ozone, Sol-gels

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SPIE Journal Paper | 1 February 1995

Thermal distortion test facility

James Stapp

OE, Vol. 34, Issue 02, (February 1995) https://doi.org/10.1117/12.10.1117/12.194195

KEYWORDS: Mirrors, Distortion, Interferometers, Temperature metrology, Optical coatings, Electron beams, Cameras, High power lasers, Glasses, Raster graphics

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Proceedings Article | 25 February 1993 Paper

Thermal distortion test facility

James Stapp

Proceedings Volume 1739, (1993) https://doi.org/10.1117/12.140507

KEYWORDS: Mirrors, Distortion, Interferometers, Temperature metrology, Optical coatings, Glasses, Cameras, Electron beams, Infrared cameras, Heat flux

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Showing 5 of 7 publications

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