Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Georgi T. Georgiev"'
Autor:
Brent J. Bos, David L. Donovan, John I. Capone, Chen Wang, Terra C. Hardwick, Dylan E. Bell, Yuqing Zhu, Robert Podgurski, Bashar Rizk, Ireneusz Orlowski, Rachel A. Edison, David A. Harvey, Brianna Dizon, Lindsay Haseltine, Kristoffer C. Olsen, Chad Sheng, Robert R. Bousquet, Luan Q. Vo, Georgi T. Georgiev, Kristen A. Washington, Michael J. Singer, Stefan Ioana, Anloc H. Le, Elena M. Georgieva, Michael T. Hackett, Michael A. Ravine, Michael Caplinger, Phillip Coulter, Erin Percy, Charles Torisky, Jean-Marie Lauenstein, Kaitlyn L. Ryder, Michael J. Campola, Dillon E. Johnstone, William J. Thomes, Richard G. Schnurr, John C. McCloskey, Eugenia L. De Marco, Ellen Lee, Calinda M. Yew, Bo Yang, Mingyu Han, Bartosz Blonski
Publikováno v:
Aerospace, Vol 11, Iss 6, p 456 (2024)
The successful 2020 launch and 2021 landing of the National Aeronautics and Space Administration’s (NASA) Perseverance Mars rover initiated the first phase of the NASA and European Space Agency (ESA) Mars Sample Return (MSR) campaign. The goal of t
Externí odkaz:
https://doaj.org/article/3207884a029b49e5bb3a0db85bfe960b
Autor:
Paul Lemaillet, Leonard M. Hanssen, Georgi T. Georgiev, Heather Patrick, B. Carol Johnson, Thomas A. Germer
Publikováno v:
Proc SPIE Int Soc Opt Eng
Fused silica diffusers, made by forming scattering centers inside fused silica glass, can exhibit desirable optical properties, such as reflectance or transmittance independent of viewing angle, spectrally flat response into the ultraviolet wavelengt
Publikováno v:
Journal of Physics: Conference Series. 2149:012012
This paper describes the initial work of characterizing the transmissive and reflective properties of black silicon diffusers. The diffusers were fabricated from a 100 mm diameter black silicon sample at NASA’s Goddard Space Flight Center (GSFC). T
Autor:
Elena Georgieva, James J. Butler, Ron Shiri, Christine A. Jhabvala, Edward J. Wollack, Georgi T. Georgiev
Publikováno v:
Sensors, Systems, and Next-Generation Satellites XXIII.
Space-based astrophysical and remote sensing observations often require the detection and measurement of light originating from distant and relatively faint objects. These observations are highly susceptible to scattered light which may introduce ima
Autor:
Shahid Aslam, Sreeja Nag, Charles K. Gatebe, Georgi T. Georgiev, Bert A. Pasquale, Tilak Hewagama
Publikováno v:
IEEE Sensors Journal. 17:5252-5268
Multispectral snapshot imagers are capable of producing 2-D spatial images with a single exposure at selected, numerous wavelengths using the same camera, therefore, operate differently from push broom or whiskbroom imagers. They are payloads of choi
Autor:
Christine A. Jhabvala, Peter Petrone, Rémi Soummer, Edward J. Wollack, Alyssa Barlis, Michael P. Biskach, W. W. Zhang, James J. Butler, Ron Shiri, Timo T. Saha, Marc J. Kuchner, Georgi T. Georgiev
Publikováno v:
Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II.
Many of NASA’s direct imaging of exoplanet missions and projects require fabricated coronagraph masks to control scattering and diffraction of light. The designed, patterned mask intended for the coronagraphic testbeds are highly absorptive in the
Accurate determination of the bidirectional transmittance distribution function (BTDF) of transmissive diffusers is critical for the on-orbit spectral radiance calibration of several satellite-based, Earth remote sensing instruments. This study prese
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7f974866d86cb6b58c37b31aa7ba8dd3
https://europepmc.org/articles/PMC7067061/
https://europepmc.org/articles/PMC7067061/
Autor:
Yana Z. Williams, Joe Predina, Hyung R. Lee, Kory J. Priestley, Georgi T. Georgiev, Cindy Young, Christopher R. Randall, Mohan Shankar, Richard Hertel, Loren Woody
Publikováno v:
Earth Observing Systems
Radiation Budget Instrument (RBI) is a scanning radiometer that measures earth reflected solar radiance and thermal emission at the top-of-atmosphere. RBI has three radiance channels that cover 0.25-5μm, 5-100μm and 0.25-100μm spectral bands respe
Publikováno v:
IGARSS
The Radiation Budget Instrument (RBI) on-board Solar Calibration Target (SCT) concept and operation are presented in this paper. The SCT used during solar calibration of RBI is based on reflection properties of sintered Polytetrafluoroethylene (PTFE)
Autor:
G A Meadows, L J Graziani, James J. Butler, L A Ramos-Izquierdo, L. Ding, Georgi T. Georgiev, Kurt Thome
Publikováno v:
Metrologia. 51:S319-S328
Changes in the directional reflectance properties of pressed and sintered polytetrafluoroethylene (PTFE) diffusers induced by exposure to vacuum ultraviolet (VUV) irradiation before and after controlled contamination with Pennzane are presented in th