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Search Publications by: Yoshi Ohno (Assoc)

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Displaying 226 - 250 of 391

Obtaining Spectral Data for Colorimetry

June 1, 2003
Author(s)
Yoshihiro Ohno
Simulation analyses have been conducted on the colorimetric errors associated with the data interval, bandpass, and wavelength errors of a spectrometer, using spectral data of 43 object color samples including those from CIE 13.3, BCRA tiles, and the

Modified Allard Method for Effective Intensity of Flashing Lights

August 1, 2002
Author(s)
Yoshihiro Ohno, D Couzin
For the measurement of effective intensity of flashing lights, the Blondel-Rey, Blondel-Rev-Douglas, Form Factor, and Allard methods are adopted in various applications. These methods produce significantly different results depending on the pulse waveforms

Luminous Intensity of LEDs at NIST

October 1, 2001
Author(s)
Carl C. Miller, Yoshihiro Ohno
Calibration facilities and procedures for measurement of Averaged LED intensity using the detector-based method have been developed at the National Institute of Standards and Technology (NIST). The scale has been established on two standard photometers

Photometry: Sensing Light Color

September 1, 2001
Author(s)
Yoshihiro Ohno, Steven W. Brown
This article first addresses the need and importance of photometry and colorimetry for many products in our daily life- light bulbs in homes and offices; TV sets, computer monitors, headlights of cars, traffic lights, etc. Then the concepts of photometry