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Author: Keith Lykke

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1. Precise Measurement of Lunar Spectral Irradiance at Visible Wavelengths
Series: Journal of Research (NIST JRES)
Report Number: 118.020
Published: 11/12/2013
Authors: Keith R Lykke, John Taylor Woodward IV, Allan W. Smith
Abstract: We report a measurement of lunar spectral irradiance with an uncertainty below 1 % from 420 nm to 1000 nm. This measurement uncertainty meets the stability requirement for many climate data records derived from satellite images, including those f ...

2. Using a Tunable Ultraviolet Laser for the Inactivation of Water Pathogens
Published: 9/22/2013
Authors: Thomas C Larason, Keith R Lykke, Ping-Shine Shaw, Lin Chungsan
Abstract: Ultraviolet (UV) radiation effectively inactivates common pathogens found in ground and surface waters such as Cryptosporidium, Giardia, and most bacterial pathogens (e.g. E. coli). Water treatment facilities are now using UV radiation for disinfect ...

3. A novel apparatus to measure reflected sunlight from the Moon
Published: 9/19/2013
Authors: Claire Elizabeth Cramer, Gerald T Fraser, Keith R Lykke, John Taylor Woodward IV, Alan W. Smith
Abstract: We describe a new apparatus for measuring the spectral irradiance of the Moon at visible wavelengths. Our effort builds upon the United States Geological Survey‰s highly successful Robotic Lunar Observatory (ROLO), which determined a precise model fo ...

4. Stray light correction algorithm for multi-spectral hyperspectral spectrographs
Published: 6/1/2012
Authors: Michael Feinholz, Stephanie J Flora, Steven W Brown, Yuqin Zong, Keith R Lykke, Mark A. Yarbrough, Bettye C Johnson, D. K. Clark
Abstract: An algorithm is developed to correct a multi-channel fiber-coupled spectrograph for stray or scattered light within the system. The efficacy of the algorithm is evaluated based on a series of validation measurements of sources with different spectra ...

5. The Pan-STARRS1 Photometric System
Published: 5/10/2012
Authors: J. L. Tonry, Christopher W Stubbs, Keith R Lykke, Peter Doherty, I. S. Shivvers, W. S. Burgett, K. C. Chambers, K. W Hodapp, N. Kaiser, R -P Kudritzki, E. A. Magnier, J. S, Morgan, P. A. Price, R. J. Wainscoat
Abstract: The Pan-STARRS1 survey is collecting multi-epoch, multi-color observations of the sky north of declination −30 to unprecedented depths. These data are being photometrically and astrometrically calibrated and will serve as a reference for man ...

6. New method for spectral irradiance and radiance responsivity calibrations using kHz pulsed tunable optical parametric oscillators
Published: 3/2/2012
Authors: Yuqin Zong, Steven W Brown, George P Eppeldauer, Keith R Lykke, Yoshihiro Ohno
Abstract: Continuous-wave (CW) tunable lasers have been used for detector calibrations, especially for spectral irradiance and radiance responsivity, for many years at the National Institute of Standards and Technology (NIST) and other national metrology insti ...

7. Determination of the quantum yield of the ferrioxalate and KI/KIO3 actinometers and a method for the calibration of radiometer detectors
Published: 7/5/2011
Authors: J R Bolton, Michaela I. Stefan, Ping-Shine Shaw, Keith R Lykke
Abstract: Abstract: The quantum yields for two popular actinometers have been determined using the tunable laser light source at the National Institute for Standards and Technology in Gaithersburg, MD. The power of this light source has been calibrated agains ...

8. 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 ...

9. 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 ...

10. 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 ...

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