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Author: john woodward iv
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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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913841

2. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914538

3. New Instruments to Calibrate Atmospheric Transmission
Published: 9/17/2012
Authors: Claire Elizabeth Cramer, Keith R Lykke, John Taylor Woodward IV, Peter Zimmer, John T McGraw, Daniel C Zirzow
Abstract: 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 atmo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913048

4. 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
Published: 9/13/2012
Authors: John Taylor Woodward IV, Keith R Lykke, Claire Elizabeth Cramer, John T McGraw, Peter Zimmer, Daniel C Zirzow, Susana Deustua, Dean Hines
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913049

5. Tunable Laser Techniques for Improving the Precision of Optical Astronomy
Published: 9/13/2012
Authors: Keith R Lykke, Claire Elizabeth Cramer, John Taylor Woodward IV, Steven W Brown, Ping-Shine Shaw
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911767

6. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906521

7. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906058

8. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904680

9. 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, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903023

10. Multimodal, Nanoscale, Hyperspectral Imaging Demonstrated on Heterostructures of Quantum Dots and DNA-Wrapped Single-Wall Carbon Nanotubes
Published: 10/21/2009
Authors: Hyeong Gon Kang, Matthew Lawrence Clarke, Jianyong Tang, John Taylor Woodward IV, Shin G. Chou, Zhenping Zhou, Angela R Hight Walker, Tinh Nguyen, Jeeseong Hwang
Abstract: A multimodality imaging technique integrating atomic force, polarized Raman, and fluorescence lifetime microscopy and a 2D autocorrelation image analysis is applied to study the properties of a mesoscopic heterostucture of nanoscale materials. This ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902938



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