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Search Publications by: Yuqin Zong (Fed)

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Displaying 26 - 50 of 99

NIST Measurement Services: Photometric Calibrations

July 10, 2018
Author(s)
Carl C. Miller, Maria E. Nadal, Benjamin K. Tsai, Yuqin Zong
The National Institute of Standards and Technology provides calibration services for submitted artifacts for luminous intensity, illuminance, color temperature, total luminous flux, luminous exposure and luminance. Additionally, the National Institute of

SOLID-STATE LIGHTING MEASUREMENT ASSURANCE PROGRAM SUMMARY WITH ANALYSIS OF METADATA

March 31, 2016
Author(s)
Carl C. Miller, Yoshihiro Ohno, Maria E. Nadal, Benjamin K. Tsai, Yuqin Zong
The National Institute of Standards and Technology (NIST) began to offer proficiency testing for Solid-State Lighting (SSL) products through a Measurement Assurance Program (MAP) in 2010. This article communicates the results of the first version of the

Proceedings of SPIE

March 4, 2015
Author(s)
Maritoni A. Litorja, Aaron A. Urbas, Yuqin Zong
The fluorescent light detected by a clinical imager is assumed to be proportional to the amount of fluorescent substance present in the sample. Unfortunately, there are many factors that can add or subtract to the light signal directly attributable to the

DEVELOPMENT OF 2 pi? TOTAL SPECTRAL RADIANT FLUX STANDARDS AT NIST

April 23, 2014
Author(s)
Yuqin Zong, Haiping Shen
We have developed a new, reflector lamp based 2 pi transfer standard for total spectral radiant flux (TSRF) scale in the spectral range from 360 nm to 1100 nm. Correlated colour temperature of the standard lamp is 3000 K. Spectral aging rate is ±0.3 % for

The distance dependences and spatial uniformities of spectral irradiance standard lamps

October 19, 2012
Author(s)
Howard W. Yoon, Gary D. Graham, Robert D. Saunders, Yuqin Zong, Eric L. Shirley
We describe the characterization of a group of NIST spectral irradiance lamps at longer distances and larger angles than are typically issued by NIST. The spectral irradiances from the FEL lamps were measured from 50 cm to 150 cm at 8 different distances

Development of a fully automated LED lifetime test system

September 21, 2012
Author(s)
Yuqin Zong, Jeff Hulett
A fully automated system for light-emitting diode (LED) lifetime test has been developed and is undergoing validation. This system uses a 1 m integrating sphere for both aging and optical measurements of 480 LEDs. It features six test zones, each of which

Stray light correction algorithm for multi-spectral hyperspectral spectrographs

June 1, 2012
Author(s)
Michael Feinholz, Stephanie J. Flora, Steven W. Brown, Yuqin Zong, Keith R. Lykke, Mark A. Yarbrough, B. Carol Johnson, D. K. Clark
An algorithm is developed to correct a multi-channel fiber-coupled spectrograph for stray or scattered light within the system. The efficacy of the algorithm is evaluated based on a series of validation measurements of sources with different spectral

Analysis of Uncertainties in Stray-Light Correction

December 1, 2010
Author(s)
Yuqin Zong
Measurement errors arising from stray light within a spectroradiometer are often the dominant source of uncertainty and are difficult to reduce. However, the stray-light errors can be corrected by using a stray-light correction matrix that is derived from