From the category archives:

Blackbodies

Electro Optical Industries BB Emissivity Coatings

November 5, 2009

Electro Optical Industries (EOI) uses one of two high emissivity coatings on the surface of its blackbodies.
The EOI mid-temperature coating is used on both cavity and flat plate blackbodies that have a maximum operating temperatures of up to 210 °C.

Read the rest by visiting their webpage at: www.electro-optical.com/html/bb_rad/emissivity/emis_data.asp

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Blackbody Emissivity Primer

October 30, 2009

From the Electro-Optical Industries website:

“Effective emissivity is the ratio of the total amount of energy exiting a blackbody to that which is predicted by Planck’s law. This is the value most frequently referred to as “emissivity”. Effective emissivity of a cavity type blackbody will normally be much higher than the surface emissivity due to the [...]

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Measurements of Pool-Fire Temperature Using IR Technique. (419 K)

May 12, 2009

By Qian, C.; Saito, K.
Ref: Combustion Institute/Central and Western States (USA) and Combustion Institute/Mexican National Section and American Flame Research Committee. Combustion Fundamentals and Applications. Joint Technical Meeting. Proceedings. April 23-26, 1995, San Antonio, TX, Gore, J. P., Editor(s), 81-86 pp, 1995.
Sponsor: National Institute of Standards and Technology, Gaithersburg, MD
Abstract:
We made an attempt to measure [...]

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EMISSIVITY EVALUATION OF FIXED POINT BLACKBODIES

December 12, 2008

A paper by Sergey Mekhontsev, Vladimir Khromchenko, Alexander Prokhorov, Leonard Hanssen
National Institute for Standards and Technology, Gaithersburg, MD, USA
Presented at the 9th International Symposium on Temperature and Thermal Measurements in Industry and Science (TEMPMEKO 2004), June 22-25, 2004, Dubrovnik, Croatia, Proceedings, Vol. 1, ed. by D. Zvizdic (2004), pp. 581-586.
ABSTRACT
A new facility for [...]

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IR spectral characterization of customer blackbody sources:

December 5, 2008

“First calibration results”
A paper by S. Mekhontsev, M. Noorma, A. Prokhorov, and L. Hanssen from NIST in the USA, Presented at Thermosense XXVIII, ed. by Jonathan J. Miles, G. Raymond Peacock, and Kathryn M. Knettel, Proc. of SPIE 6205, 620503 (2006).
ABSTRACT:
We summarize recent progress in our infrared (IR) spectral radiance metrology effort. In support of [...]

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The RET Theory

February 23, 2008

Ircon, Inc., a leading producer of industrial radiation thermometers, line scanners and quantitative thermal imagers, in its training programs for many years used to teach something they called the RAT Theory.
Reflectance, Absorbtance and Transmittance, or the coefficients of them, abbreviated as R, A &T must sum to 100%, or R + A + T=1.
An easy [...]

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NASA Tech Reports Emittance Abstracts

September 20, 2007

A Search on the NASA website results in the following abstracts

 

DETERMINATION OF THE EMISSIVITY OF MATERIALS
Author(s): Askwyth, W. H.
Abstract: Space power systems – emissivity of candidate materials for snap-8 powerplant
NASA Center: NASA (non Center Specific)
Publication Year: 1962
Added to NTRS: 2006-11-06
Accession Number: 63N11697; Document ID: 19630001823; Report Number: PWA-2088

Determination of emissivity of materials quarterly progress report, [...]

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Beginner’s Guide to (Spectral) Emissivity

September 8, 2007

Introductory Guide to Emissivity

This is an introductory page on the National Physical Laboratory (NPL) website in the UK.
It has several such sketches as on the left showing the concept of the “radiometric method” of emissivity measurement and discusses both the concepts and measurement methods used to quantify spectral and total emissivity values.
The page also features [...]

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Red, White & Blue Blackbodies?

September 5, 2007

It is not an oxymoron, nor a quote from Yogi Berra.
Real Blackbodies do not exist, at least on Earth. Only approximations or simulations are real. We use them to calibrate IR Thermometers, Radiation Pyrometers and Thermal Imagers.
Technically they should have a spectral emissivity very close to 1.0. How close, you might ask? Read on.
Max Planck [...]

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