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Search Publications by: David W. Allen (Fed)

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Displaying 51 - 75 of 91

The Extension of the NIST BRDF Scale from 1100 nm to 2500 nm

August 21, 2009
Author(s)
Howard W. Yoon, David W. Allen, George P. Eppeldauer, Benjamin K. Tsai
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 are

Hyperspectral Image Compressive Projection Algorithm

June 1, 2009
Author(s)
Joseph P. Rice, Jorge E. Neira, David W. Allen
We describe a compressive projection algorithm and quantitatively assess its performance when used with a Hyperspectral Image Projector (HIP). The HIP is being developed by NIST for system-level performance testing of hyperspectral and multispectral

Holmium Oxide Glass Wavelengths Standards

January 1, 2008
Author(s)
David W. Allen
Holmium oxide glass has been used as a wavelength standard for over four decades. These standards have shown very little variation from batch to batch and from one manufacturer to another. NIST has certified and recertified holmium oxide glass samples for

Dynamically Programmable Digital Tissue Phantoms

December 31, 2007
Author(s)
Steven W. Brown, Joseph P. Rice, David W. Allen, Maritoni A. Litorja, Karel Zuzak, Edward Livingston
As optical imaging modalities gain acceptance for medical diagnostics and become common in clinical applications, standardized protocols to quantitatively assess optical sensor performance are required to ensure commonality in measurements and to validate

Evaluation of a Portable Hyperspectral Imager for Medical Imaging Applications

October 2, 2007
Author(s)
David W. Allen, Maritoni A. Litorja, Steven W. Brown, Joseph P. Rice, Yuqin Zong
Portable hyperspectral imagers are becoming commonly available as a commercial product. A liquid crystal tunable filter based CCD imager was evaluated and characterized for spectral stray light using a tunable laser facility. The hyperspectral imager is

Thermodynamic-Temperature Determinations of the Ag and Au Freezing Temperatures Using a Detector-Based Radiation Thermometer

May 20, 2007
Author(s)
Howard W. Yoon, David W. Allen, Charles E. Gibson, Maritoni A. Litorja, Robert D. Saunders, Steven W. Brown, George P. Eppeldauer, Keith R. Lykke
We describe the development of a radiation thermometer calibrated for spectral radiance responsivity using cryogenic, electrical-substitution radiometry to determine the thermodynamic temperatures of the Ag- and Au-freezing temperatures. The absolute

Development of Surgical Lighting for Enhanced Color Contrast

May 14, 2007
Author(s)
Maritoni A. Litorja, Steven W. Brown, Maria E. Nadal, David W. Allen, Alexander Gorbach
The National Institute of Standards and Technology and the National Institutes of Health have started a collaborative study on the development of lighting that will provide enhanced, specific to various tissues, contrast with respect to its surroundings

Calibration and Characterization of Trap Detector Filter Radiometers

November 1, 2003
Author(s)
David W. Allen, George P. Eppeldauer, Steven W. Brown, E A. Early, Bettye C. Johnson, Keith R. Lykke
We describe the development of a mechanically simple, radiometrically stable transfer radiometer designed for both radiance and irradiance measurements. The filter radiometer consists of a six-element Si trap detector, a temperature stabilized filter wheel

Temperature Scales Using Radiation Thermometers Calibratied From Absolute Irradiance and Radiance Responsivity

August 21, 2003
Author(s)
Howard W. Yoon, David W. Allen, Charles E. Gibson, Robert D. Saunders, Bettye C. Johnson, Steven W. Brown, Keith R. Lykke
In the International Temperature Scale of 1990 (ITS-90), temperatures above the freezing temperature of silver are defined with radiation thermometers calibrated using spectral radiance ratios to one of the silver-, gold- or copper-freezing temperature
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