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Search Publications by: Yoshi Ohno (Assoc)

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Displaying 301 - 325 of 391

Radiometry and Photometry: Review for Vision Optics

January 1, 2000
Author(s)
Yoshihiro Ohno
Radiometry is the measurement of optical radiation, which is electromagnetic radiation in the frequency range between 3 x 10 11 Hz and 3 x 10 16 Hz. This range corresponds to wavelengths between 10 nm and 1000 m, and includes the regions commonly called

Calibrations of Colorimeters for Display Measurements: Some Commercial Colorimeters Have Uncertainties in Display-Color Measurements That Are Too Large for Many Commercial, Industrial and Military Applications - But New NIST-Developed Calibration Proc...

December 1, 1999
Author(s)
Steven W. Brown, Yuqin Zong, Yoshihiro Ohno
Commercial color measuring instruments (colorimeters and spectroradiometers) are currently used in a number of product development and control environments, as well as for product acceptance testing and a variety of other applications. In many cases, the

Kilohertz Linewidth From Frequency-Stabilized Mid-Infrared Quantum Cascade Lasers

December 1, 1999
Author(s)
R M. Williams, J F. Kelly, J S. Hartman, S W. Sharpe, M S. Taubman, J L. Hall, F Capasso, D L. Sivco, J N. Bailargeon, Yoshi Ohno
Frequency stabilization of mid-IR quantum cascade (AC) lasers to the kilohertz level has been accomplished by use of electronic servo techniques. With this acive feedback, an 8.5- m QC distributed-feedback laser is locked to the side of a rovibrational

NIST Photometry and Colorimetry Facilities

December 1, 1999
Author(s)
Yoshihiro Ohno
Web site for public domain information and publications on NIST activities in photometry and colorimetry. Note: the copies of the NIST photometry papers are the final manuscripts and are not identical with the published versions in styles and editorial

Colorimetric Accuracies and Concerns in Spectroradiometry of LEDs

October 2, 1999
Author(s)
C Jones, Yoshi Ohno
LEDs are narrow-band emission sources and present special problems in colorimetric characterization. Chromaticity space is mapped using Gaussian spectral models to represent narrow-band emission sources. The Gaussian maps show that the spectral regions are

Photometry The CIE V(l) Function and What Can Be Learned from Photometry

September 1, 1999
Author(s)
Yoshihiro Ohno, E A. Thompson
The V(l) function, used in photometry, is an average action spectrum for the visual response of the human eye, and the matching of the spectral responsivity of photometers to V(l) is the most important criterion of photometers. Techniques have been

Detector-Based Integrating Sphere Photometry

June 24, 1999
Author(s)
Yoshihiro Ohno, Yuqin Zong
A new luminous flux calibration facility using a 2.5 m integrating sphere has been developed at NIST. The Absolute Integrating-Sphere Method, developed for realization of the lumen in 1995, has been applied to routine calibration measurements of luminous

NIST Calibration Facility for Display Colorimeters

April 12, 1999
Author(s)
Steven W. Brown, Yoshihiro Ohno
A calibration facility has been developed at the National Institute of Standards and Technology (NIST) to address the need for high accuracy color measurementsof displays. Calibration services tailored to display measuremets are planned for colimeters and