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Author: keith lykke

Displaying records 11 to 20 of 114 records.
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11. Ground-based observatory operations optimized and enhanced by direct atmospheric measurements
Published: 7/22/2010
Authors: John T McGraw, Peter C Zimmer, Azzam Mansour, Dean C Hines, Anthony B Hull, Lisa Rossmann, Daniel C Zirzow, Steven W Brown, Gerald T Fraser, Keith R Lykke, Allan W. Smith, John Taylor Woodward IV, Christopher W Stubbs
Abstract: Earth‰s atmosphere represents a turbulent, turbid refractive element for every ground-based telescope. We describe the significantly enhanced and optimized operation of observatories supported by the combination of a lidar and spectrophotometer that ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906521

12. 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

13. Long-Term Monitoring of the Ultraviolet Irradiance Scale at the Facility for Irradiance Calibration Using Synchrotrons
Published: 6/18/2010
Authors: Zhigang Li, Ping-Shine Shaw, Uwe Arp, Charles E Gibson, Howard W Yoon, Keith R Lykke
Abstract: In 2004, the National Institute of Standards and Technology (NIST) established the ultraviolet (UV) spectral irradiance scale from 200 nm to 400 nm using the calculable irradiance of the Synchrotron Ultraviolet Radiation Facility (SURF). Since the es ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904737

14. 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

15. 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

16. Best Practice Guidelines for Pre-Launch Characterization and Calibration of Instruments for Passive Optical Remote Sensing
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7637
Published: 11/1/2009
Authors: Raju Vsnu Datla, Joseph Paul Rice, Keith R Lykke, Bettye C Johnson, James J. Butler, Xiaoxiong Xiong
Abstract: The pre-launch characterization and calibration of remote sensing instruments should be planned and carried out in conjunction with their design and development to meet the mission requirements. In the case of infrared instruments, the onboard calibr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902518

17. 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

18. Measurement of the ultraviolet-induced fluorescence yield from integrating spheres
Published: 6/2/2009
Authors: Ping-Shine Shaw, Uwe Arp, Keith R Lykke
Abstract: We report theory and measurements of a simple and absolute technique for the determination of the total emitted spectral fluorescence yield inside an integrating sphere from the sphere coating under irradiation with a monochromatic beam. This techniq ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842602

19. 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

20. Ultraviolet degradation study of photomultiplier tubes at SURF III
Published: 5/8/2009
Authors: Ping-Shine Shaw, Lindsay Hum, Zhigang Li, Keith R Lykke, Michael Bishop
Abstract: Photomultiplier tubes (PMTs) are used in biological detection systems in order to detect the presence of biological warfare agents. To ensure proper operation of these biological detection systems, the performance of PMTs must be characterized in ter ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902573



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