You searched on: Author: keith lykke
Displaying records 11 to 20 of 117 records.
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11. 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 ...
12. 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 ...
13. 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 ...
14. Results from Solar Reflective Band End-to-End Testing
for VIIRS F1 Sensor Using T-SIRCUS
Jeff McIntire, David Moyer, James K McCarthy, Steven W Brown, Keith R Lykke, Frank De Luccia, Xiaoxiong Xiong, James J Butler, Bruce Guenther
Verification of the Visible Infrared Imager Radiometer Suite (VIIRS) End-to-End
(E2E) sensor calibration is highly recommended before launch, to identify any anomalies and
to improve our understanding of the sensor on-orbit calibration performance. ...
15. Determination of the quantum yield of the ferrioxalate and KI/KIO3 actinometers and a method for the calibration of radiometer detectors
J R Bolton, Michaela I. Stefan, Ping-Shine Shaw, Keith R Lykke
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 ...
16. 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 ...
17. 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 ...
18. 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 ...
19. 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 ...
20. Hyperspectral Imager Characterization and Calibration
John Taylor Woodward IV, Steven W Brown, Allan W. Smith, Keith R Lykke
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, ...