Dr. Anita K. Thompson Profile

Dr. Anita K. Thompson

at Goddard Space Flight Center

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Author

Publications (12)

Proceedings Article | 20 August 2020 Presentation + Paper

BSDF measurements and analyses of specular samples using a table-top goniometer in support of remote sensing instruments

Jinan Zeng, James Butler, Xiaoxiong Xiong, Anita Thompson, Robert Bousquet

Proceedings Volume 11485, 114850A (2020) https://doi.org/10.1117/12.2569290

KEYWORDS: Data modeling, Mirrors, Sensors, Light scattering, Scattering, Convolution, Reflectivity, Signal detection, Statistical modeling

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Bidirectional Scattering Distribution Function (BSDF) measurements of selected specular samples were made using the Table-Top Goniometer (TTG) in the Diffuser Calibration Lab (DCL) at NASA GSFC in the support of NASA remote sensing instruments and programs. The same TTG system has also been used in the BRDF measurements for diffuse samples. The tunable laser-based TTG possesses the advantages of small incident beam profile and configuration flexibility and is able to meet various BSDF test requirements on specular samples with flat and curved surfaces. It also has a useful capability in characterizing instrument straylight due to surface roughness and in determining the scattering light distribution function of optical surfaces. The BSDF measurements on specular samples can be performed over 8 orders of linear dynamic range with correction of instrument signatures. In this paper, we present BSDF results on two types of specular samples: a witness flat fold mirror for the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) project and four Multi-Layer Insulation (MLI) samples for the Restore project at NASA GSFC. BRDF measurements in the viewing angle range of ± 90° were acquired at 500 nm, 700 nm, and 2000 nm and at incident angles of 0°, 8°, and 25° for the PACE sample, and at 500 nm, 633 nm, 700 nm, 900 nm, 1000 nm, 1550 nm, and 1800 nm at incident angles of 10° and 25° for the MLI samples. For both types of samples, the ABg model was applied to fit the BSDF data to generate the parameters for optical modeling. The ABg model is able to fit the BSDF data on the polished surface of the flat mirror very well. However, two scattering components were seen in the MLI BSDF fitting results attributed to wrinkle and surface morphology issues. Total Hemispherical Reflectance (THR) and Total Integrated Scatter (TIS) measurements were also made on the samples and were compared to the BSDF results. The details of the BSDF measurement setup and the methodology for realization of the BRDF scale for the specular samples are also described.

Proceedings Article | 20 September 2007 Paper

An optical model of the wide-field imaging interferometry testbed

David Leisawitz, Anthony Martino, Anita Thompson, Stephen Rinehart, Bradley Frey

Proceedings Volume 6687, 66870J (2007) https://doi.org/10.1117/12.735145

KEYWORDS: Interferometry, Interferometers, Mirrors, Data modeling, Visibility, Hardware testing, Sensors, Performance modeling, Light, Imaging systems

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Proceedings Article | 28 June 2006 Paper

The wide-field imaging interferometry testbed: recent results

S. Rinehart, T. Armstrong, Bradley Frey, J. Jung, J. Kirk, David Leisawitz, Douglas Leviton, R. Lyon, Anthony Martino, Lee Mundy, T. Pauls, A. Thompson

Proceedings Volume 6268, 626836 (2006) https://doi.org/10.1117/12.672110

KEYWORDS: Interferometry, Visibility, Algorithm development, Data acquisition, Reconstruction algorithms, Interferometers, Cameras, Fourier transforms, Space telescopes, Infrared telescopes

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Proceedings Article | 28 June 2006 Paper

Optical modeling of the wide-field imaging interferometry testbed

Anita Thompson, Anthony Martino, Stephen Rinehart, David Leisawitz, Douglas Leviton, Bradley Frey

Proceedings Volume 6268, 62682R (2006) https://doi.org/10.1117/12.672281

KEYWORDS: Mirrors, Interferometers, Interferometry, Visibility, Data modeling, Gaussian beams, Beam splitters, Integration, Point spread functions, Geometrical optics

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Proceedings Article | 31 August 2005 Paper

Optical design considerations for the Terrestrial Planet Finder–Coronagraph mission: optical telescope assembly

Joseph Howard, Pantazis Mouroulis, Anita Thompson, Andrew Smith, David Content, Timothy Ho, Clifton Jackson, Raymond Ohl, Stuart Shaklan

Proceedings Volume 5874, 58740I (2005) https://doi.org/10.1117/12.618380

KEYWORDS: Mirrors, Telescopes, Planets, Stars, Coronagraphy, Optical instrument design, Phase modulation, Wavefronts, Optical design, Exoplanets

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SPIE Journal Paper | 1 August 1996

Performance predictions of a Schwarzschild imaging microscope for soft x-ray applications

James Harvey, Kristin Lewotsky, Anita Thompson

OE, Vol. 35, Issue 08, (August 1996) https://doi.org/10.1117/12.10.1117/1.601011

KEYWORDS: Scattering, Spatial frequencies, Microscopes, Diffraction, Image quality, X-rays, Optical fabrication, Mirrors, Image resolution, Point spread functions

Proceedings Article | 1 September 1995 Paper

Scattering effects of machined optical surfaces

Anita Kotha, James Harvey

Proceedings Volume 2541, (1995) https://doi.org/10.1117/12.218340

KEYWORDS: Surface finishing, Scattering, Optics manufacturing, Spatial frequencies, Zinc, Diamond, Polishing, Image quality, Diamond machining, Germanium

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Proceedings Article | 2 August 1995 Paper

Scattering effects from residual optical fabrication errors

James Harvey, Anita Thompson

Proceedings Volume 2576, (1995) https://doi.org/10.1117/12.215588

KEYWORDS: Scattering, Spatial frequencies, Optical fabrication, Light scattering, Image quality, Surface finishing, Tolerancing, Laser scattering, Imaging systems, Diffraction

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Proceedings Article | 29 June 1994 Paper

Reciprocal path imaging: a technique for the mitigation of image degradation due to atmospheric turbulence

Anita Kotha, James Harvey, Ronald Phillips

Proceedings Volume 2222, (1994) https://doi.org/10.1117/12.178015

KEYWORDS: Atmospheric turbulence, Atmospheric optics, Laser imaging, Laser scattering, Electromagnetic scattering, Scattering, Electromagnetic radiation, Backscatter, Constructive interference, Multiple scattering

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Proceedings Article | 29 June 1994 Paper

Fundamental limitations of reciprocal path imaging through the atmosphere with dilute subaperture arrays

James Harvey, Anita Thompson, Ronald Phillips

Proceedings Volume 2222, (1994) https://doi.org/10.1117/12.178016

KEYWORDS: Spatial frequencies, Image quality, Modulation transfer functions, Spatial resolution

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Proceedings Article | 1 February 1994 Paper

Enhanced EUV performance of Wolter type II telescopes

Anita Kotha, James Harvey

Proceedings Volume 2011, (1994) https://doi.org/10.1117/12.167212

KEYWORDS: Mirrors, Extreme ultraviolet, Telescopes, Spatial frequencies, Diffraction, Image quality, Optical fabrication, Error analysis, Tolerancing, Optical instrument design

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Proceedings Article | 13 January 1993 Paper

Performance limitations of imaging microscopes for soft x-ray applications

Kristin Lewotsky, Anita Thompson, James Harvey

Proceedings Volume 1741, (1993) https://doi.org/10.1117/12.138762

KEYWORDS: Error analysis, Optical fabrication, X-rays, Microscopes, X-ray imaging, Mirrors, Spatial frequencies, Diffraction, Scattering, Monochromatic aberrations

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Showing 5 of 12 publications

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