Dr. Howard W. Yoon Profile

Dr. Howard W. Yoon

Physical Scientist at National Institute of Standards and Technology

SPIE Involvement:

Author | Instructor

Publications (22)

Proceedings Article | 2 May 2019 Paper

Improvements in the design of thermal-infrared radiation thermometers and sensors

Howard Yoon, Vladimir Khromchenko, George Eppeldauer

Proceedings Volume 11004, 1100408 (2019) https://doi.org/10.1117/12.2519506

KEYWORDS: Temperature metrology, Sensors, Black bodies, Calibration, Thermography, Optical design, Infrared radiation, Pyroelectric detectors, Signal detection, Optical components

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Proceedings Article | 7 September 2016 Paper

Broadband radiometric LED measurements

G. Eppeldauer, C. Cooksey, H. Yoon, L. Hanssen, V. Podobedov, R. Vest, U. Arp, C. Miller

Proceedings Volume 9954, 99540J (2016) https://doi.org/10.1117/12.2237033

KEYWORDS: Ultraviolet radiation, Light emitting diodes, Calibration, Radiometry, Sensors, Pyroelectric detectors, Blue light emitting diodes, Silicon, Standards development, Optical filters

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Proceedings Article | 8 September 2015 Paper

Standardization of UV LED measurements

G. Eppeldauer, T. Larason, H. Yoon

Proceedings Volume 9571, 957105 (2015) https://doi.org/10.1117/12.2189714

KEYWORDS: Light emitting diodes, Ultraviolet radiation, Calibration, Lamps, Sensors, Free electron lasers, Ultraviolet light emitting diodes, Optical filters, Standards development, Ultraviolet sources

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Proceedings Article | 19 October 2012 Paper

The distance dependences and spatial uniformities of spectral irradiance standard lamps

Howard Yoon, Gary Graham, Robert Saunders, Yuqin Zong, Eric Shirley

Proceedings Volume 8510, 85100D (2012) https://doi.org/10.1117/12.930800

KEYWORDS: Lamps, Free electron lasers, Radiometry, Calibration, Distance measurement, Optical filters, Sensors, Diffusers, Optical benches, Diodes

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Proceedings Article | 15 October 2012 Paper

Validation of the dissemination of spectral irradiance values using FEL lamps

B. Johnson, Gary Graham, Robert Saunders, Howard Yoon, Eric Shirley

Proceedings Volume 8510, 85100E (2012) https://doi.org/10.1117/12.930801

KEYWORDS: Lamps, Calibration, Free electron lasers, Photometry, Sensors, Radiometry, Spectrographs, Silicon, Kinematics, Resistors

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Proceedings Article | 13 February 2012 Paper

Hyperspectral image projector applications

Joseph Rice, Steven Brown, David Allen, Howard Yoon, Maritoni Litorja, Jeeseong Hwang

Proceedings Volume 8254, 82540R (2012) https://doi.org/10.1117/12.907898

KEYWORDS: Digital micromirror devices, Hyperspectral imaging, Projection systems, Sensors, Calibration, Remote sensing, Photovoltaics, Imaging systems, Prototyping, Short wave infrared radiation

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Proceedings Article | 2 September 2009 Paper

Spectral irradiance responsivity calibration of InSb radiometers using the improved IR-SIRCUS at NIST

Jinan Zeng, Howard Yoon, George Eppeldauer, Leonard Hanssen, Joseph Rice

Proceedings Volume 7453, 74530N (2009) https://doi.org/10.1117/12.828699

KEYWORDS: Radiometry, Calibration, Integrating spheres, Sensors, Spectral calibration, Speckle, Optical parametric oscillators, Optical filters, Optical spheres, Tunable lasers

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Proceedings Article | 21 August 2009 Paper

The extension of the NIST BRDF scale from 1100 nm to 2500 nm

Howard Yoon, David Allen, George Eppeldauer, Benjamin Tsai

Proceedings Volume 7452, 745204 (2009) https://doi.org/10.1117/12.827293

KEYWORDS: Reflectivity, Radiometry, Sensors, Calibration, Monochromators, Radio optics, Polarization, Infrared radiation, Indium gallium arsenide, Lamps

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Proceedings Article | 21 August 2009 Paper

Spectroradiometric characterization of the NIST pulsed solar simulator

Howard Yoon, Brian Dougherty, Vladimir Khromchenko

Proceedings Volume 7410, 741008 (2009) https://doi.org/10.1117/12.827296

KEYWORDS: Calibration, Solar cells, Spectrographs, Silicon, Personal digital assistants, Spectral calibration, Indium gallium arsenide, Lamps, Solar energy, Free electron lasers

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Proceedings Article | 15 May 2008 Paper

Infrared collimator calibrations using regular glass optics and short-wave infrared detectors

Howard Yoon, George Eppeldauer, Vladimir Khromchenko

Proceedings Volume 6940, 694038 (2008) https://doi.org/10.1117/12.783771

KEYWORDS: Sensors, Collimators, Infrared radiation, Calibration, Infrared detectors, Short wave infrared radiation, Thermography, Black bodies, Glasses, Optical filters

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Proceedings Article | 1 May 2008 Paper

Low NEP pyroelectric radiometer standards

G. Eppeldauer, J. Zeng, H. Yoon

Proceedings Volume 6940, 694036 (2008) https://doi.org/10.1117/12.776940

KEYWORDS: Sensors, Pyroelectric detectors, Monochromators, Signal detection, Signal to noise ratio, Radiometry, Calibration, Infrared radiation, Temperature metrology, Standards development

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Proceedings Article | 17 March 2008 Paper

IEC 62942-1 TS: First international technical specification on the technical data for radiation thermometers

J. Hollandt, O. Struss, G. Beynon, R. Bosma, R. Gaertner, F. Girard, M. Matveyev, H. McEvoy, G. Peacock, M. Sadli, F. Sakuma, H. Yoon, Z. Yuan

Proceedings Volume 6939, 693908 (2008) https://doi.org/10.1117/12.792390

KEYWORDS: Temperature metrology, Metrology, Distance measurement, Standards development, Radiation thermometry, Manufacturing, Process control, Temperature sensors, Humidity, Time metrology

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Proceedings Article | 26 September 2007 Paper

Absolute flux calibrations of stars

Gerald Fraser, Steven Brown, Howard Yoon, B. Carol Johnson, Keith Lykke

Proceedings Volume 6678, 66780P (2007) https://doi.org/10.1117/12.734600

KEYWORDS: Black bodies, Calibration, Stars, Telescopes, Atmospheric modeling, Transmittance, Copper, Photometry, Stray light, Diffraction

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Proceedings Article | 14 May 2007 Paper

Short-wave infrared radiometers design and characterizations

George Eppeldauer, Howard Yoon

Proceedings Volume 6542, 65420O (2007) https://doi.org/10.1117/12.720548

KEYWORDS: Sensors, Radiometry, Resistance, Silicon, Calibration, Head, Resistors, Infrared radiation, Short wave infrared radiation, Thermography

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Proceedings Article | 8 September 2006 Paper

Performance comparisons of InGaAs, extended InGaAs, and short-wave HgCdTe detectors between 1 µm and 2.5 µm

Howard Yoon, Matt Dopkiss, George Eppeldauer

Proceedings Volume 6297, 629703 (2006) https://doi.org/10.1117/12.684614

KEYWORDS: Sensors, Indium gallium arsenide, Diodes, Resistance, Photodiodes, Temperature metrology, Infrared sensors, Monochromators, Infrared detectors, Mercury cadmium telluride

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Proceedings Article | 18 April 2006 Paper

Flow visualization of heated CO₂ gas using thermal imaging

Howard Yoon, Meredith Brenner, Joseph Rice, Nathaniel Briggs, Greg Gillen

Proceedings Volume 6205, 62050U (2006) https://doi.org/10.1117/12.664991

KEYWORDS: Carbon monoxide, Thermography, Temperature metrology, Visualization, Absorption, Calibration, Black bodies, Nonuniformity corrections, Staring arrays, Optical filters

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Proceedings Article | 28 March 2005 Paper

Simultaneous visible and thermal imaging of metals during machining

Eric Whitenton, Robert Ivester, Howard Yoon

Proceedings Volume 5782, (2005) https://doi.org/10.1117/12.605487

KEYWORDS: Thermography, Visible radiation, Cameras, Temperature metrology, Interfaces, Infrared imaging, Infrared radiation, Imaging systems, Metals, Infrared cameras

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Proceedings Article | 22 August 2003 Paper

A method for testing the spectral responsivity of infrared cameras using tunable lasers

Joseph Rice, Keith Lykke, Howard Yoon

Proceedings Volume 5076, (2003) https://doi.org/10.1117/12.487113

KEYWORDS: Cameras, Digital micromirror devices, Sensors, Mirrors, Tunable lasers, Interferometers, Projection systems, Infrared cameras, Integrating spheres, Calibration

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Proceedings Article | 1 April 2003 Paper

Thermal imaging of metals in a Kolsky-bar apparatus

Howard Yoon, Debasis Basak, Richard Rhorer, Eric Whitenton, Timothy Burns, Richard Fields, Lyle Levine

Proceedings Volume 5073, (2003) https://doi.org/10.1117/12.488111

KEYWORDS: Temperature metrology, Calibration, Thermography, Reflectivity, Black bodies, Cameras, Metals, Thermodynamics, Sensors, Indium gallium arsenide

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Proceedings Article | 23 March 2001 Paper

Noncontact thermometry in the Optical Technology Division at NIST

Charles Gibson, Howard Yoon, Benjamin Tsai, B. Carol Johnson, Robert Saunders

Proceedings Volume 4360, (2001) https://doi.org/10.1117/12.421011

KEYWORDS: Calibration, Black bodies, Temperature metrology, Sensors, Radiometry, Thermography, Thermodynamics, Lamps, Pyrometry, Francium

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Proceedings Article | 30 March 2000 Paper

Calibrated thermal microscopy of the tool-chip interface in machining

Howard Yoon, Matthew Davies, Timothy Burns, M. Kennedy

Proceedings Volume 4020, (2000) https://doi.org/10.1117/12.381557

KEYWORDS: Temperature metrology, Calibration, Microscopes, Reflectivity, Thermography, Interfaces, Staring arrays, Black bodies, Microscopy, Spatial resolution

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Proceedings Article | 28 December 1999 Paper

Radiometric measurement comparisons using transfer radiometers in support of the calibration of NASA's Earth Observing System (EOS) sensors

James Butler, B. Carol Johnson, Steven Brown, Howard Yoon, Robert Barnes, Brian Markham, Stuart Biggar, Edward Zalewski, Paul Spyak, John Cooper, Fumihiro Sakuma

Proceedings Volume 3870, (1999) https://doi.org/10.1117/12.373186

KEYWORDS: Radiometry, Optical spheres, Calibration, Integrating spheres, Short wave infrared radiation, Sensors, Satellites, Infrared radiation, Lamps, Remote sensing

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EOS satellite instruments operating in the visible through the shortwave infrared wavelength regions (from 0.4 micrometer to 2.5 micrometer) are calibrated prior to flight for radiance response using integrating spheres at a number of instrument builder facilities. The traceability of the radiance produced by these spheres with respect to international standards is the responsibility of the instrument builder, and different calibration techniques are employed by those builders. The National Aeronautics and Space Administration's (NASA's) Earth Observing System (EOS) Project Science Office, realizing the importance of preflight calibration and cross-calibration, has sponsored a number of radiometric measurement comparisons, the main purpose of which is to validate the radiometric scale assigned to the integrating spheres by the instrument builders. This paper describes the radiometric measurement comparisons, the use of stable transfer radiometers to perform the measurements, and the measurement approaches and protocols used to validate integrating sphere radiances. Stable transfer radiometers from the National Institute of Standards and Technology, the University of Arizona Optical Sciences Center Remote Sensing Group, NASA's Goddard Space Flight Center, and the National Research Laboratory of Metrology in Japan, have participated in these comparisons. The approaches used in the comparisons include the measurement of multiple integrating sphere lamp levels, repeat measurements of select lamp levels, the use of the stable radiometers as external sphere monitors, and the rapid reporting of measurement results. Results from several comparisons are presented. The absolute radiometric calibration standard uncertainties required by the EOS satellite instruments are typically in the plus or minus 3% to plus or minus 5% range. Preliminary results reported during eleven radiometric measurement comparisons held between February 1995 and May 1998 have shown the radiance of integrating spheres agreed to within plus or minus 2.5% from the average at blue wavelengths and to within plus or minus 1.7% from the average at red and near infrared wavelengths. This level of agreement lends confidence in the use of the transfer radiometers in validating the radiance scales assigned by EOS instrument calibration facilities to their integrating sphere sources.

Showing 5 of 22 publications

Course Instructor

SC1109: Infrared Radiometric Calibration

This course describes the radiometric calibration techniques used for SI-traceable measurements of sources, detectors and material properties in the infrared wavelength region. The main goal is to enable understanding of infrared measurements with quantified uncertainties so that full uncertainty budgets can be established for the final quantities. Examples from NIST calibrations of sources, detectors and materials will be described. The properties and measurements of various different blackbody and lamp sources will be discussed. Detector calibrations using both thermal and quantum detectors with monochromators and Fourier-transform spectrometers will be covered. Also, infrared reflectance measurements using Fourier-transform spectrometers will be explained. Examples of NIST-developed infrared transfer and working standard radiometers in field deployments will be utilized to illustrate the above concepts.

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