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You searched on: Author: steven brown

Displaying records 11 to 20 of 153 records.
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11. Spectroradiometric Calibration of Telescopes using Laser Illumination of Flat Field Screens
Published: 7/15/2010
Authors: Steven W Brown, Claire Elizabeth Cramer, Keith R. Lykke, Allan W. Smith, John Taylor Woodward IV, Peter Doherty, Emilio Falco, Christopher W Stubbs
Abstract: It is standard practice at many telescopes to take a series of flat field images prior to an observation run. Typically the flat field consists of a screen mounted inside the telescope dome that is uniformly illuminated with a broadband light source ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906058

12. Space-based photometric precision from ground-based telescopes
Published: 7/1/2010
Authors: Peter C Zimmer, John T McGraw, Anthony B Hull, Daniel C Zirzow, Steven W Brown, Claire Elizabeth Cramer, Gerald T Fraser, Keith R. Lykke, Allan W. Smith, John Taylor Woodward IV, Christopher W Stubbs, Mark R Ackermann, Dean C Hines
Abstract: Ground-based telescopes supported by lidar and spectrophotometric auxiliary instrumentation can attain space-based precision for all-sky photometry, with uncertainties dominated by fundamental photon counting statistics. Earth‟s atmosphere is a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906522

13. Internal quantum efficiency modeling of silicon photodiodes
Published: 4/1/2010
Authors: Thomas R Gentile, Steven W Brown, Keith R. Lykke, Ping-Shine Shaw, John Taylor Woodward IV
Abstract: Results are presented for modeling of the internal quantum efficiency (IQE) of silicon photodiodes in the 400 nm to 900 nm wavelength range. The IQE data are based on measurements of the external quantum efficiencies of three transmission trap detec ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904680

14. Hyperspectral Imager Characterization and Calibration
Published: 12/1/2009
Authors: John Taylor Woodward IV, Steven W Brown, Allan W. Smith, Keith R. Lykke
Abstract: Current radiometric calibration standards, specifically blackbody and lamp-based optical radiation sources, produce spatially, spectrally, and temporally simple scenes. Hyperspectral imaging instruments, which in-practice view spatially, spectrally, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903023

15. Report on the Key Comparison CCPR K2.a-2003
Published: 10/30/2009
Authors: Yoshihiro Ohno, Steven W Brown, Thomas C Larason
Abstract: Under the framework of Mutual Recognition Arrangement (MRA) for national measurements standards and for calibration and measurement certificates issued by National Metrology Institutes (NMIs) signed in 1999, an international comparison of spectral re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904379

16. Absolute Flux Calibration of Stars; Calibration of the Reference Telescope
Published: 6/2/2009
Authors: Allan W. Smith, John Taylor Woodward IV, Colleen Alana Jenkins, Steven W Brown, Keith R. Lykke
Abstract: Absolute stellar photometry is based on 1970s terrestrial measurements of the star Vega with instruments calibrated using the Planckian radiance from a Cu fixed-point blackbody. Significant advances in absolute radiometry have been made in the last 3 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900900

17. Supercontinuum Sources for Metrology
Published: 6/2/2009
Authors: John Taylor Woodward IV, Allan W. Smith, Colleen Alana Jenkins, Chungsan Lin, Steven W Brown, Keith R. Lykke
Abstract: Supercontinuum (SC) sources are novel laser-based sources that generate a broad, white-light continuum in single mode photonic crystal fibers. Currently, up to 6 W of optical power is available, spanning the spectral range from 460 nm to 2500 nm. A ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900202

18. Illumination with enhanced contrast as a visualization tool for clinical diagnostics and surgery
Published: 2/26/2009
Authors: Maritoni Abatayo Litorja, Steven W Brown, Yoshihiro Ohno, Chungsan Lin
Abstract: The requirements for diagnostic and surgical lighting have remained largely unchanged over the past several years illumination level, glare, shadow and tissue heating reduction are the dominant factors in choosing a lighting system. Since human visu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901403

19. Stray Light Correction of the Marine Optical System
Published: 1/1/2009
Authors: M Feinholz, S Flora, M Yarbrough, Keith R. Lykke, Steven W Brown, Bettye C Johnson, Dennis Clark
Abstract: The Marine Optical System is a spectrograph-based sensor used in the Marine Optical Buoy for the vicarious calibration of ocean color satellite sensors. It is also deployed from ships in instruments used to develop bio-optical algorithms that relate ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841158

20. The Marine Optical BuoY (MOBY) Radiometric Calibration and Uncertainty Budget for Ocean Color Satellite Sensor Vicarious Calibration
Published: 12/31/2008
Authors: M Feinholz, Bettye C Johnson, Steven W Brown, S Flora, M Yarbrough, Terrance Houlihan, D Peters, Yong S. Kim, J Mueller, Dennis Clark
Abstract: For the past decade, the Marine Optical Buoy (MOBY), an autonomous radiometric buoy stationed in the waters off Lanai, Hawaii, has been the primary in-water oceanic observatory for the vicarious calibration of the U. S. satellite ocean color sensors ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842574



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