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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. 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 ...

4. 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 ...

5. 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 ...

6. 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 ...

7. 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 ...

8. 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, ...

9. 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 ...

10. 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 ...

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