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Displaying records 21 to 30 of 125 records.
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21. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904737

22. Calibrations of Current-to-Voltage Transimpedance Amplifiers Using Electrical Standards
Published: 6/13/2010
Authors: Howard W Yoon, George P Eppeldauer, Dean G Jarrett, Thomas C Larason, Wan-Seop Kim
Abstract: For photocurrent measurements with low uncertainties, a wide-dynamic range current-to-voltage converter traceable to resistance standards has been developed at the NIST. The design and calibration of the converter standard are described. For validat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905053

23. Spectral irradiance responsivity calibration of InSb radiometers using the improved IR-SIRCUS at NIST
Published: 10/15/2009
Authors: Jinan Zeng, Howard W Yoon, George P Eppeldauer, Leonard M Hanssen, Joseph Paul Rice
Abstract: The spectral irradiance responsivity calibrations of InSb radiometers measured on the tunable-laser based Infrared Spectral Irradiance and Radiance Responsivity Calibration with Uniform Sources (IR-SIRCUS) facility are discussed. This work describes ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903522

24. The Extension of the NIST BRDF Scale from 1100 nm to 2500 nm
Published: 8/21/2009
Authors: Howard W Yoon, David W Allen, George P Eppeldauer, Benjamin K Tsai
Abstract: Measurements of bi-directional reflectance factor for diffuse reflectance from 1100 nm to 2500 nm using extended-range indium gallium arsenide (exInGaAs) detectors in the NIST Spectral Tri-function Automated Reference Reflectometer (STARR) facility ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904078

25. Spectroradiometric Characterization of the NIST Pulsed Solar Simulator
Published: 8/20/2009
Authors: Howard W Yoon, Brian P Dougherty, Vladimir Khromchenko
Abstract: The spectroradiometric characterization of the NIST indoor pulsed solar simulator is described. The solar simulator has a flash duration of 36.4 ms and is designed for solar panels having a maximum size of 2.0 m by 1.6 m. As per industry standards, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904077

26. CCPR-S1 Supplementary Comparison for Spectral Radiance in the range of 220 nm to 2500 nm
Published: 6/2/2009
Authors: Boris Khlevnoy, Victor Sapritsky, Bernard Rougie, Charles E Gibson, Howard W Yoon, Arnold A. Gaertner, Dieter Taubert, Juergen Hartmann
Abstract: In 1997, the Consultative Committee for Photometry and Radiometry (CCPR) initiated a supplementary comparison of spectral radiance in the wavelength range from 220 nm to 2500 nm (CCPR S1) using tungsten -strip filament lamps as transfer standards. Fi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900253

27. Extension of the NIST spectral responsivity scale to the infrared using improved-NEP pyroelectric detectors
Published: 6/2/2009
Authors: George P Eppeldauer, Jinan Zeng, Howard W Yoon, Boris Wilthan, Thomas C Larason, Leonard M Hanssen
Abstract: Routine NIST spectral responsivity calibrations are needed for the infrared range. Low NEP pyroelectric radiometers have been developed for traditional monochromator applications to extend the responsivity scale to the infrared. After NEP tests, the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900961

28. Radiometer standard for absolute responsivity calibrations from 950 nm to 1650 nm with 0.05% (k = 2) uncertainty
Published: 6/2/2009
Authors: George P Eppeldauer, Howard W Yoon, Yuqin Zong, Thomas C Larason, Allan W. Smith, M. Racz
Abstract: A sphere-input transfer-standard detector has been developed to calibrate detectors and radiometers for absolute spectral power, irradiance, and radiance responsivity in the near-IR range with uncertainties similar to those of silicon trap-detector c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900973

29. Evaluation of Thermal Imaging Cameras
Published: 10/1/2008
Authors: Francine K. Amon, Andrew J. Lock, Nelson P Bryner, Joseph Paul Rice, Howard W Yoon
Abstract: Four thermal infrared cameras that were provided by Bureau of Industry and Security (BIS) to NIST were each evaluated by the NIST Optical Technology Division (OTD) for three metrics: Noise-equivalent Temperature Difference (NETD), Minimum Detectable ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900887

30. AC-mode SW-IR radiation thermometers for measurement of ambient temperatures
Published: 5/10/2007
Authors: George P Eppeldauer, Howard W Yoon
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104430



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