You searched on: Author: keith lykke
Displaying records 11 to 20 of 121 records.
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11. New Instruments to Calibrate Atmospheric Transmission
Claire Elizabeth Cramer, Keith R. Lykke, John Taylor Woodward IV, Peter Zimmer, John T McGraw, Daniel C Zirzow
Changing atmospheric transmission accounts for the largest systematic errors limiting photometric measurement precision and
accuracy for ground-based telescopes. While considerable resources have been devoted to correcting the effects of the
12. Near-field Calibration of an Objective Spectrophotometer to NIST Radiometric Standards for the Creation and Maintenance of
Standard Stars for Ground- and Space-Based Applications
John Taylor Woodward IV, Keith R. Lykke, Claire Elizabeth Cramer, John T McGraw, Peter Zimmer, Daniel C Zirzow, Susana Deustua, Dean Hines
NIST-calibrated detectors will be used by the ground-based 100mm diameter Astronomical Extinction Spectrophotometer (AESoP)
to calibrate the spectral energy distributions of bright stars to sub-1% per 1nm spectral resolution element accuracy. AESo ...
13. Tunable Laser Techniques for Improving the Precision of
Keith R. Lykke, Claire Elizabeth Cramer, John Taylor Woodward IV, Steven W Brown, Ping-Shine Shaw
Improving the precision of optical astronomy requires not only new telescopes and instrumentation, but also advances in observing protocols, calibrations and data analysis. The Laser Applications Group at the National Institute of Standards and Techn ...
14. 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 ...
15. 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 ...
16. 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 ...
17. 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. ...
18. 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 ...
19. 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 ...
20. 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 ...