U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Yoshi Ohno (Fed)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 151 - 175 of 198

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

NIST Colorimetric Calibration Facility for Displays Colorimeters

January 1, 1999
Author(s)
Steven W. Brown, Yoshihiro Ohno
A facility has been developed at the National Institute of Standards and Technology (NIST) to calibrate color-measuring instruments for displays. The instruments will be calibrated for measurements of cathode-ray tube (CRT) and flat panel displays (FPD)

Four-Color Matrix Method for Correction of Tristimulus Colorimeters Part 2

November 20, 1998
Author(s)
Yoshihiro Ohno, Steven W. Brown
The Four-Color Method was developed to improve the accuracy of tristimulus colorimeters for measurements of color displays. It was verified that the method works well for CRTs. The accuracy of this method has been studied further for spectral variations of

NIST Reference Spectroradiometer for Color Display Calibrations

November 20, 1998
Author(s)
Steven W. Brown, Yoshihiro Ohno
A program has recently been established at the National Institute of Standards and Technology (NIST) to develop calibration services for color-measuring instruments to address commercial and industrial needs for higher-accuracy measurements of displays. In