References

ASTM E307-72(2002)

September 30, 2007

ASTM E307-72(2002): Standard Test Method for Normal Spectral Emittance at Elevated Temperatures Developed by Subcommittee: E21.04 Book of Standards Volume: 15.03 “1. Scope “1.1 This test method describes a highly accurate technique for measuring the normal spectral emittance of electrically conducting materials or materials with electrically conducting substrates, in the temperature range from 600 to [...]

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STANDARDIZATION OF THERMAL EMITTANCE MEASUREMENTS. PART 5

September 28, 2007

Title: STANDARDIZATION OF THERMAL EMITTANCE MEASUREMENTS. PART 5. NORMAL SPECTRAL EMITTANCE, 800-1400 K (ABSTRACT BELOW) DOWNLOAD FULL REPORT IN PDF FORMAT Corporate Author : NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD Personal Author(s) : Harrison, William N. ; Richmond, Joseph C. ; Shorten, Frederick J. ; Joseph, Horace M. Handle / proxy Url : http://handle.dtic.mil/100.2/AD426846 Report [...]

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Emissivity Tips at IRINFO.ORG

September 23, 2007

For your reference, there are several that deal with emittance that may be of interest to you. For your convenience, they are on the IRINFO.org web pages at the following links: www.irinfo.org/tip_of_week_2004.html#t02092004 www.irinfo.org/tip_of_week_2004.html#t04052004 www.irinfo.org/tip_of_week_2003.html#t09292003 www.irinfo.org/tip_of_week_2004.html#t08022004 www.irinfo.org/tip_of_week_2005.html#t09122005 www.irinfo.org/tip_of_week_2005.html#t09192005 www.irinfo.org/tip_of_week_2005.html#t09262005 <a href="http://www.irinfo.org/tip_of_week_2007.html#t05282007" title="http://www.irinfo.org/tip_of_week_2007.html” target=”_blank”>www.irinfo.org/tip_of_week_2007.html#t05282007 Enjoy!

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Evaluating Emittance in the Lab or Field

September 18, 2007
photograph

NASA Portable Infrared Reflectometer Designed and Manufactured The optical properties of materials play a key role in spacecraft thermal control. In space, radiant heat transfer is the only mode of heat transfer that can reject heat from a spacecraft. One of the key properties for defining radiant heat transfer is emittance, a measure of how [...]

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18 Emissivity FAQs at evitherm

September 14, 2007

Emissivity & other infrared-optical properties FAQs at the evitherm website, evitherm is the European Virtual Institute for Thermal Metrology Click on the number below for an answer on the evitherm website… C1. What is the emissivity of a surface? C2. Why is emissivity important? C3. How is emissivity used? C4. Is it easy to measure [...]

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Inconel, Inconel-X and Type 347 SS

September 12, 2007

Effects of Preoxidation Treatments on Spectral Normal and Total Normal Emittance of Inconel, Inconel-X and Type 347 Stainless Steel Authors: Wayne S. Slemp; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER Abstract: The spectral/normal-emittance values of several oxidized surfaces prepared by varying the preoxidation treatments or oxidation time for inconel, Inconel-X, and type [...]

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NIST IR Spectral Emittance Lab

September 11, 2007
emittance_fig

The Optical Properties measurements laboratory at The USA National Institute of Standards & Technology (NIST), a part of the Optical Technology Division of the PHYSICS Laboratory has been developing a full spectral emissivity (emittance) measurement capability. This facility enables the measurement of spectral emittance using the direct method of radiance comparison of the sample with [...]

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Beginner’s Guide to (Spectral) Emissivity

September 8, 2007
Sketch of the concept of spectral emissivity measurement

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 [...]

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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 [...]

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Effects of atmosphere, temperature and emittance on reflected and emitted energy

September 4, 2007

A NASA report by R. Kumar, dated Sep 1, 1977, available online and downloadable as a PDF document. ABSTRACT: The effects of temperature and emittance on the relative magnitude of reflected energy and emitter energy from a target including atmospheric effects was studied. From the calculations of energy reflected and emitted from a target including [...]

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