From the category archives:

Natural Materials

Table of Emissivities in Three Popular Spectral Regions

May 9, 2009

The Table of Emissivity on the INFRAPOINT Messtechnik GmbH website (Click here to visit) has summary data for a wide variety of materials broken down into three distinct spectral regions for the wavelength regions where the majority of infrared radiation thermometers and Infrared Thermal Imaging cameras operate.
First and second are tables that deal with the [...]

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Temporal variations in the apparent emissivity of various materials

March 4, 2009

Temporal variations in the apparent emissivity of various materials
Author: Salvaggio, C.; Miller, D.P.
Author URL: www.cis.rit.edu/~cnspci/publications/5425-29.pdf
Year: 2004
Abstract:
Spectral emissivity measurements gathered in the longwave infrared region of the spectrum during a recent airborne hyperspectral data collection experiment indicated that the spectral emissivity of certain organic polymers changed by as much as 10% throughout the day. Inorganic and [...]

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Portable Fourier transform infrared spectroradiometer for field measurements of radiance & emissivity

February 24, 2009

By Andrew R. Korb, Peter Dybwad, Winthrop Wadsworth, and John W. Salisbury
ABSTRACT
A hand-held, battery-powered Fourier transform infrared spectroradiometer weighing 12.5 kg has been developed for the field measurement of spectral radiance from the Earth’s surface and atmosphere in the 3–5-µm and 8–14-µm atmospheric windows, with a 6-cm21 spectral resolution. Other versions of this instrument measure [...]

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A Temperature and Emissivity Separation Algorithm…

July 25, 2008

A Temperature and Emissivity Separation Algorithm for Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Images
by: Alan Gillespie, Shuichi Rokugawa, Tsuneo Matsunaga, J. Steven Cothern, Simon Hook, and Anne Kahle
Click Here to view or save
Manuscript received October 31, 1997. This work was a collaborative effort of the U.S. and Japanese EOS/ASTER instrument teams, sponsored [...]

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ET10 Reflectometer Measures Emissivity

March 21, 2008

San Diego CA, USA –Surface Optics’ ET10 measures emissivity values in two most commonly used spectral regions, 3 to 5 and 8 to 12 microns.
Its main application is to produce emissivity values for the infrared cameras.
Advanced IR cameras require the input of an emissivity value for accurate temperature calculations. The emissivity values obtained from tables [...]

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Systematic Errors in the Measurement of Emissivity Caused by Directional Effects

December 10, 2007

In the Optics InfoBase, by the American Institute of Physics’ Optical Society of America:
Authors: Abraham Kribus, Irna Vishnevetsky, Eyal Rotenberg, and Dan Yakir

Applied Optics, Vol. 42, Issue 10, pp. 1839-1846
Keywords (OCIS):
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(260.3060) Physical optics : Infrared
(300.2140) Spectroscopy : Emission
Abstract
Accurate knowledge of surface emissivity is essential for [...]

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SPECTRAL MEASUREMENTS FIELD GUIDE

October 12, 2007

This web site gives the executive summary and table of contents for the Field Guide.
Here’s a summary of what the Field Guide is all about in the words of its authors:
EXECUTIVE SUMMARY
“Because of the rapid advance of airborne and satellite sensor technology in providing higher spectral resolution over progressively broader wavelength regions, there is a [...]

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Optical Properties Measurements, Data and 3D Models

September 18, 2007

Surface Optics Corporation (SOC) operates a world-class measurement facility equipped for the most demanding spectral measurement tasks for spectral directional and bidirectional reflectance measurements for modeling, simulation, special effects and more.
Spectral measurements can be made in wavelength regions from the ultraviolet to long wave infrared and include one or all of [...]

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Evaluating Emittance in the Lab or Field

September 18, 2007

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 efficiently a [...]

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