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Author: howard yoon

Displaying records 31 to 40 of 110 records.
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31. Portable LED-illuminated radiance source
Published: 1/1/2004
Authors: David W Allen, G Dezsi, Howard W Yoon
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104297

32. Temperature determinations of the Ag and Au-freezing points using a detector-based radiation thermometer
Published: 1/1/2004
Authors: David W Allen, Steven W Brown, George P Eppeldauer, Charles E Gibson, Maritoni Abatayo Litorja, Keith R Lykke, Robert D. Saunders, Howard W Yoon
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104295

33. The realization and the dissemination of the detector-based kelvin
Published: 1/1/2004
Authors: David W Allen, Steven W Brown, George P Eppeldauer, Charles E Gibson, Maritoni Abatayo Litorja, Keith R Lykke, Robert D. Saunders, Howard W Yoon
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104293

34. Thermal Imaging of Metals in a Kolsky-Bar Apparatus
Published: 10/1/2003
Authors: Howard W Yoon, D Basak, Richard L. Rhorer, Eric P Whitenton, Timothy J Burns, Richard Joel Fields, Lyle E Levine
Abstract: For materials testing at elevated temperatures, we describe the design and the development of a resistively heated Kolsky-bar apparatus. The temperature of the sample is determined by non-contact thermometry and the spatial temperature gradients in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841727

35. Spectral Radiance Comparisons of Two Blackbodies with Temperatures Determined Using Absolute Detectors and ITS-90 Techniques
Published: 9/1/2003
Authors: Howard W Yoon, Charles E Gibson, J L Gardner
Abstract: For calibrations of spectral irradiance standards, a high-temperature blackbody (HTBB) is used as a source of spectral radiance or irradiance as derived from Planck's radiance law. The temperature of such a blackbody can be determined using radiance ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841679

36. The Development and Characterization of an Absolute Pyrometer Calibrated for Radiance Responsivity
Published: 9/1/2003
Authors: David W Allen, Robert D. Saunders, Bettye C Johnson, Charles E Gibson, Howard W Yoon
Abstract: The International Temperature Scale of 1990 (ITS-90), for temperatures above the freezing temperature of silver, is defined with pyrometers which rely upon spectral radiance ratios to one of the silver, gold or copper freezing temperature blackbodies ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841673

37. A Method for Testing the Spectral Responsivity of Infrared Cameras Using Tunable Lasers
Published: 8/1/2003
Authors: Joseph Paul Rice, Keith R Lykke, Howard W Yoon
Abstract: We are developing a technique for accurately measuring spectral responsivity functions of infrared cameras using tunable lasers. We present preliminary results for uniform scenes where tunable infrared lasers illuminate an integrating sphere, diffus ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841716

38. Kolsky Bar With Electrical Pulse Heating of the Sample
Published: 6/1/2003
Authors: Eric P Whitenton, Michael Kennedy, Matthew A. Davies, Gerald V. Blessing, Brian S. Dutterer, Richard L. Rhorer, Howard W Yoon, Lyle E Levine, Richard Joel Fields, D Basak, Timothy J Burns
Abstract: The accuracy of simulations for modeling of machining processes is often limited due to insufficient knowledge of the material properties during machining, which can involve strain rates on the order of 104 per second or higher, plus rapid material h ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821995

39. A SURF Beamline for Synchrotron Source-Based Absolute Radiometry
Published: 2/1/2003
Authors: Ping-Shine Shaw, Uwe Arp, Howard W Yoon, Robert D. Saunders, Albert C. Parr, Keith R Lykke
Abstract: A new source-based radiometry beamline at Synchrotron Ultraviolet Radiation Facility (SURF III) was constructed recently. The goal of this beamline is to establish a national source standard with wide spectral range from far UVto IR by using the cal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841629

40. FASCAL 2: A New NIST Facility for the Calibration of the Spectral Irradiance of Sources
Published: 2/1/2003
Authors: Howard W Yoon, J E Proctor, Charles E Gibson
Abstract: The Facility for Automated Spectroradiometric Calibrations (FASCAL) is the primary facility for spectral irradiance and spectral radiance calibrations at NIST and has been in continous use since the early 1970's. Due to the increasing demands for sp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841660