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Displaying 26 - 50 of 294

Evaluation of dome-input geometry for pyroelectric detectors

June 24, 2013
Author(s)
Jinan Zeng, Leonard M. Hanssen, George P. Eppeldauer
Dome-input pyroelectric radiometers with different black coatings were developed to extend the spectral responsivity scale from near infrared (NIR) to 20 μm. The reflective dome with shiny gold-coating has been known to be an efficient light trap to

Standardization of Broadband UV Measurements

January 1, 2013
Author(s)
George P. Eppeldauer
The CIE standardized rectangular-shape UV response functions can be realized only with large spectral mismatch errors. The spectral power-distribution of UV sources is not standardized. Accordingly, the readings of different types of UV meters, even if

PV-MCT working standard radiometer

April 24, 2012
Author(s)
George P. Eppeldauer, Vyacheslav B. Podobedov
Sensitive infrared working-standard detectors with large active area are needed to extend the signal dynamic range of the National Institute of Standards and Technology (NIST) pyroelectric transfer-standards used for infrared spectral power responsivity

Matrix-based color measurement corrections of tristimulus colorimeters

April 20, 2012
Author(s)
George P. Eppeldauer, Z. T. Kosztyan, J. D. Schanda
For image taking colorimetry the tristimulus technique is still the best practical method to keep the measurement time within reasonable limits. However, the achievable color measurement uncertainties for special sources can be significant because of the

Infrared detector calibrations

March 22, 2012
Author(s)
George P. Eppeldauer, Vyacheslav B. Podobedov
An InSb working standard radiometer, first calibrated at NIST in 1999 against a cryogenic bolometer, was recently calibrated against a newly developed low-NEP pyroelectric transfer standard detector. The pyroelectric transfer standard, which can operate at

Comparison of laser-based and monochromator-based thermodynamic temperature measurements

March 19, 2012
Author(s)
George P. Eppeldauer, Howard W. Yoon, Jorge E. Neira, Vladimir Khromchenko, Charles E. Gibson, Allan W. Smith
In this work, we describe the comparisons between the laser-based and monochromator-based radiance responsivity calibrations of a radiation thermometer. The spectral selection of the radiation thermometer is performed using a photopic-response filter which

Extension of the NIST spectral power-responsivity calibration service to 2500 nm

March 2, 2012
Author(s)
George P. Eppeldauer, Howard W. Yoon, Jinan Zeng, Thomas C. Larason, Jeanne M. Houston, Vladimir Khromchenko
The National Institute of Standards and Technology (NIST) is working to extend the upper wavelength limit of the spectral power-responsivity calibration service from 1800 nm to 2500 nm. This extension is based on extended-InGaAs (EIGA) transfer- and
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