Dr. Edward L. Cuellar Profile

Dr. Edward L. Cuellar

Optical and System Integration Senior Scientist at Trex Enterprises Corp

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Publications (15)

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 | 26 September 2007 Paper

Piston phase error due to bending of delivery fiber

Xiaojiang Pan, Dane Hult, E. Cuellar

Proceedings Volume 6712, 67120H (2007) https://doi.org/10.1117/12.748394

KEYWORDS: Interferometers, Transmitters, Optical fibers, Continuous wave operation, Fourier transforms, Fiber lasers, Phase modulation, Polarization, Fiber optics, Telescopes

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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 | 1 September 2006 Paper

Experimental study of spatial structure of turbulence at Maui Space Surveillance Site (MSSS)

Mikhail Belen'kii, Edward Cuellar, Kevin Hughes, Vincent Rye

Proceedings Volume 6304, 63040U (2006) https://doi.org/10.1117/12.679093

KEYWORDS: Turbulence, Anisotropy, Cameras, Stars, Space telescopes, Telescopes, Wavefronts, Point spread functions, Surveillance, Data acquisition

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We investigated the spatial structure of atmospheric turbulence at Maui Space Surveillance Site (MSSS) using a 3.6 m telescope and a spatial filtering receiver. This receiver simultaneously records four star images on one camera frame. The star images are formed through pupil masks representing aperture diameters of 0.1 m, 0.5m, 1.5 m, and 3.6 m. We determined the camera orientation for each data set by moving the telescope at a given angle in azimuth and elevation. We calculated the horizontal and vertical components of the image centroid and evaluated the statistics of the horizontal and vertical wavefront tilt as a function of the aperture diameter and seeing conditions. We found several evidences of anisotropy of turbulence at MSSS. On four nights we observed that the variance of on-axis horizontal tilt exceeded the variance of the vertical tilt by a factor of 1.3-3.3. We believe that this is due to anisotropy of large-scale turbulence, where the horizontal scale of the turbulent inhomogeneities exceeds their vertical scale. The estimates of the horizontal and vertical turbulence outer scale confirmed this conclusion. In addition, in several data sets the horizontal image spot diameter of the long-exposure star image exceeded the vertical image spot diameter. We also found that large apertures are more likely to have higher anisotropy coefficient values than small apertures. This is because the contribution of small-scale isotropic turbulence to the image centroid reduces with increasing telescope diameter. In the case of isotropic turbulence, the power spectral densities (PSDs) of wavefront tilt are consistent with theoretical models. The telescope vibration modes were observed at 20 Hz. In the case of anisotropic turbulence, the PSDs of the horizontal tilt component have lower slope in the high frequency range, and difference between PSDs for large and small apertures is reduced. The anisotropy of turbulence and atmospheric tilt may affect the design and performance analysis of both active and passive optical systems.

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 | 22 January 2002 Paper

GEO light imaging national testbed (GLINT) heliostat design and testing status

Marcia Thornton, Jerry Oldenettel, Dane Hult, Katrina Koski, Tracy Depue, Edward Cuellar, Jim Balfour, Morey Roof, Fred Yarger, Greg Newlin, Lee Ramzel, Peter Buchanan, Fesseha Mariam, Lee Scotese

Proceedings Volume 4489, (2002) https://doi.org/10.1117/12.453217

KEYWORDS: Mirrors, Glasses, Receivers, Finite element methods, Prototyping, Satellites, Wavefronts, Fourier transforms, Cameras, Satellite imaging

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Proceedings Article | 26 April 1995 Paper

Point-ahead-compensated illumination demonstration using BMDO/IST adaptive optics system

Michael LeFebvre, Grady Taylor, Edward Cuellar, K. Kell, David Sandler

Proceedings Volume 2376, (1995) https://doi.org/10.1117/12.208208

KEYWORDS: Satellites, Fiber optic illuminators, Adaptive optics, Mirrors, Mirror pointing, Optical design, Diffraction, Atmospheric propagation, Laser guide stars, Imaging systems

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Proceedings Article | 26 April 1995 Paper

Adaptive optics system for laser-power beam forming

Michael LeFebvre, Grady Taylor, Edward Cuellar, K. Kell, David Sandler

Proceedings Volume 2376, (1995) https://doi.org/10.1117/12.208205

KEYWORDS: Adaptive optics, Satellites, Wavefronts, Mirrors, Telescopes, Control systems, Computing systems, Cameras, Laser guide stars, Imaging systems

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Proceedings Article | 31 May 1994 Paper

Point-ahead-compensated illumination tests using the 500-channel Innovative Science and Technology Experimental Facility adaptive optics system

Michael LeFebvre, Edward Cuellar, Grady Taylor, Steven Stahl, Todd Barrett, David Sandler

Proceedings Volume 2201, (1994) https://doi.org/10.1117/12.176071

KEYWORDS: Satellites, Adaptive optics, Fiber optic illuminators, Mirrors, Laser guide stars, Wavefronts, Telescopes, Sensors, Mirror pointing, Astronomy

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Proceedings Article | 31 May 1994 Paper

High-bandwidth interferometer for real-time measurement of deformable mirrors

Todd Barrett, Alan Rego, Edward Cuellar, Michael LeFebvre, David Sandler, Robert Fugate, Brent Ellerbroek

Proceedings Volume 2201, (1994) https://doi.org/10.1117/12.176107

KEYWORDS: Interferometers, Deformable mirrors, Mirrors, Adaptive optics, Beam splitters, Cameras, Photodiodes, Astronomy, Sensors, Electronics

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Proceedings Article | 25 August 1993 Paper

Recent results for visible Rayleigh guide-star atmospheric experiments

David Sandler, Edward Cuellar, Michael LeFebvre, Todd Barrett, Robert Arnold, Steven Stahl

Proceedings Volume 1920, (1993) https://doi.org/10.1117/12.152686

KEYWORDS: Point spread functions, Adaptive optics, Wavefronts, Mirrors, Atmospheric optics, Diffraction, Modulation, Shearing interferometers, Telescopes, Segmented mirrors

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Proceedings Article | 13 January 1992 Paper

High-bandwidth long-stroke segmented mirror for atmospheric compensation

William Hulburd, Todd Barrett, Edward Cuellar, David Sandler

Proceedings Volume 1543, (1992) https://doi.org/10.1117/12.51169

KEYWORDS: Segmented mirrors, Mirrors, Image segmentation, Adaptive optics, Wavefronts, Actuators, Atmospheric optics, Imaging systems, Deformable mirrors, Light sources

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Proceedings Article | 13 January 1992 Paper

Real-time wavefront reconstruction for a 512-subaperture adaptive optical system

Paul Johnson, Richard Trissel, Edward Cuellar, Robert Arnold, David Sandler

Proceedings Volume 1543, (1992) https://doi.org/10.1117/12.51201

KEYWORDS: Wavefronts, Wavefront reconstruction, Mirrors, Actuators, Image segmentation, Phase measurement, Photodiodes, Shearing interferometers, Deformable mirrors, Wavefront sensors

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Proceedings Article | 1 December 1991 Paper

Performance tests of a 1500 degree-of-freedom adaptive optics system for atmospheric compensation

Edward Cuellar, Paul Johnson, David Sandler

Proceedings Volume 1542, (1991) https://doi.org/10.1117/12.48830

KEYWORDS: Wavefronts, Mirrors, Adaptive optics, Segmented mirrors, Sensors, Atmospheric optics, Wavefront sensors, Reconstruction algorithms, Interferometers, Turbulence

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Showing 5 of 15 publications

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