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Author: keith lykke
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1. Precise Measurement of Lunar Spectral Irradiance at Visible Wavelengths
Journal of Research (NIST JRES)
Keith R Lykke, John Taylor Woodward IV, Allan W. Smith
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
Thomas C Larason, Keith R Lykke, Ping-Shine Shaw, Lin Chungsan
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
Claire Elizabeth Cramer, Gerald T Fraser, Keith R Lykke, John Taylor Woodward IV, Alan W. Smith
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
Michael Feinholz, Stephanie J Flora, Steven W Brown, Yuqin Zong, Keith R Lykke, Mark A. Yarbrough, Bettye C Johnson, D. K. Clark
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
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
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
Yuqin Zong, Steven W Brown, George P Eppeldauer, Keith R Lykke, Yoshihiro Ohno
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. Ground-based observatory operations optimized and enhanced
by direct atmospheric measurements
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
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 ...
8. Spectroradiometric Calibration of Telescopes using Laser Illumination of Flat Field Screens
Steven W Brown, Claire Elizabeth Cramer, Keith R Lykke, Allan W. Smith, John Taylor Woodward IV, Peter Doherty, Emilio Falco, Christopher W Stubbs
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 ...
9. Long-Term Monitoring of the Ultraviolet Irradiance Scale at the Facility for Irradiance Calibration Using Synchrotrons
Zhigang Li, Ping-Shine Shaw, Uwe Arp, Charles E Gibson, Howard W Yoon, Keith R Lykke
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 ...
10. Internal quantum efficiency modeling of silicon photodiodes
Thomas R. Gentile, Steven W Brown, Keith R Lykke, Ping-Shine Shaw, John Taylor Woodward IV
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 ...