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Search Publications by: Sergey Mekhontsev (Assoc)

Displaying 26 - 50 of 88

A Determination Study of The Cavity Emissivity of the Eutectic Fixed Points Co-C, Pt-C and Re-C

December 5, 2011

Author(s)

Leonard M. Hanssen, Yohsiro Yamada, Pieter Bloembergen, Pablo Castro, Boris Wilthan, Sergey Mekhontsev

The eutectics Co-C, Pt-C and Re-C, with phase transition temperatures of 1597 K, 2011 K, and 2747 K, respectively, are presently investigated for their suitability to serve as reference points for dissemination of T (and T90) within the context of the

IR Spectral Characterization of Customer Blackbody Sources: First Calibration Results

October 16, 2008

Author(s)

Sergey Mekhontsev, Mart Noorma, A Prokhorov, Leonard Hanssen

We summarize recent progress in our infrared (IR) spectral radiance metrology effort. In support of customer blackbody characterization, a realization of the spectral radiance scale has been undertaken in the temperature range of 232 C to 962 C and

NIST Radiance Temperature and Infrared Spectral Radiance Scale at Near-Ambient Temperatures

October 16, 2008

Author(s)

Sergey Mekhontsev, V B. Khromchenko, Leonard Hanssen

The realization and the dissemination of spectral radiance and radiance temperature scales in the temperature range of -50 C to 250 C and spectral range of 3 m to 13 m at the National Institute of Standards and Technology is described. The scale is source

Evaluation of Blackbody Cavity Emissivity in the Infrared Using Total Integrated Scatter Measurements

February 1, 2008

Author(s)

Leonard M. Hanssen, Sergey Mekhontsev, Jinan Zeng, A Prokhorov

Deviations from ideal blackbody (BB) behavior can be characterized by a BB s effective emissivity. The cavity emissivity is most often obtained through a model, given a particular set of input parameters associated with the BB cavity geometry and surface

Validation of the Infrared Emissivity Characterization of Materials Through Intercomparison of Direct and Indirect Methods

August 24, 2007

Author(s)

Leonard M. Hanssen, Sergey Mekhontsev, V B. Khromchenko

A comparison of the spectral directional emissivity of samples as a function of wavelength was performed at the Fourier Transform Infrared Spectrophotometry (FTIS) Facility and the Advanced Infrared Radiometry and Imaging (AIRI) Laboratory at NIST. At the

NIST Program for the Infrared Emittance Characterization of Materials for Thermal Conductivity29/Thermal Expansion 17

June 27, 2007

Author(s)

Leonard M. Hanssen, Sergey Mekhontsev, Simon G. Kaplan

Over the past decade and a half, the National Institute of Standards and Technology (NIST) has established measurement capabilities for the characterization of the spectral emittance of material samples in the infrared spectral range of 1 to 20 microns

Use of a High Temperature Integrating Sphere Reflectometer for Surface Temperature Measurements

May 30, 2007

Author(s)

Leonard M. Hanssen, Claus Cagran, A Prokhorov, Sergey Mekhontsev, V B. Khromchenko

NIST has developed a new facility for the characterization of the infrared spectral emissivity of samples between ambient and 1000 C. For accurate measurement of the sample surface temperatures above 300 C, the system employs a high temperature

Water Heat Pipe Blackbody as a Reference Spectral Radiance Source Between 50 C and 250 C

April 17, 2006

Author(s)

Mart Noorma, Sergey Mekhontsev, V B. Khromchenko, Maritoni A. Litorja, Claus Cagran, Jinan Zeng, Leonard M. Hanssen

Realization of a radiometric temperature scale for near ambient temperatures with high accuracy is crucial for a number of demanding military and commercial applications. Reliable radiation sources with high stability and good spatial uniformity have to be

Radiation Properties of IR Calibrators With V-Grooved Surfaces

April 1, 2006

Author(s)

Leonard M. Hanssen, A Prokhorov, Sergey Mekhontsev

Use of linear or concentric grooves is a well-known approach for increasing the surface emissivity to enable the construction of compact blackbody radiators, improve absorptance of stray radiation traps, baffles and thermal radiation detectors, as well as

Design and characterization of Si and InGaAs pyrometers for radiance temperature scale realization between 232 {?}C and 962 {?}C

January 1, 2006

Author(s)

Mart Noorma, Sergey Mekhontsev, K Khromchenko, Alex Gura, Maritoni A. Litorja, Benjamin K. Tsai, Leonard M. Hanssen

Radiation properties of IR calibrators with V-grooved surfaces

January 1, 2006

Author(s)

Alexander Prokhorov, Leonard M. Hanssen, Sergey Mekhontsev

Water heat pipe blackbody as a reference spectral radiance source between 50 {?}C and 250 {?}C

January 1, 2006

Author(s)

Mart Noorma, Sergey Mekhontsev, V B. Khromchenko, Maritoni A. Litorja, Claus Cagran, Jinan Zeng, Leonard M. Hanssen

Infrared Emittance Measurements at NIST

October 5, 2005

Author(s)

Leonard M. Hanssen, Benjamin K. Tsai, Sergey Mekhontsev

A new capability for the measurement of the temperature-dependent emittance of specular samples in the near infrared spectral region has been developed in NIST s Infrared Spectrophotometry Laboratory to provide emittance measurements and standards for a

Comparison of direct and indirect methods of spectral infrared emittance measurement, ed. by D. Zvizdic

January 1, 2005

Author(s)

Leonard M. Hanssen, Alexander Prokhorov, V B. Khromchenko, Sergey Mekhontsev

Emissivity evaluation of fixed point blackbodies, ed. by D. Zvizdic

January 1, 2005

Author(s)

Sergey Mekhontsev, V B. Khromchenko, Alexander Prokhorov, Leonard M. Hanssen

Emittance standards for improved radiation thermometry during thermal processing of silicon materials, ed. by D. Zvizdic

January 1, 2005

Author(s)

Benjamin K. Tsai, D P. DeWitt, E A. Early, Leonard M. Hanssen, Sergey Mekhontsev, Matthias Rink, K G. Kreider, B J. Lee, Z M. Zhang