Spectral Emissivity & Emittance

Spectral reflectance and emittance of particulate materials
A. G. Emslie and J. R. Aronson
Applied Optics, Vol. 12, Issue 11, pp. 2563-

Citation
A. G. Emslie and J. R. Aronson, “Spectral reflectance and emittance of particulate materials,” Appl. Opt. 12, 2563- (1973)

Spectral emissivity of hydrogen chloride from 1000-3400 cm-1 V
V. Robert Stull and Gilbert N. Plass
JOSA, Vol. 50, Issue 12, pp. 1279- (1960)

Citation
V. R. Stull and G. N. Plass, “Spectral emissivity of hydrogen chloride from 1000-3400 cm-1 V,” J. Opt. Soc. Am. 50, 1279- (1960)

Hemispherical Spectral Emittance of Ablation Chars, Carbon, and Zirconia to 3700 deg K
Authors: R. G. Wilson; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER

Abstract: The initial results of the application of special optical techniques to high-temperature emittance and reflectance studies of an ablation-material char and certain other refractory materials representative of those present in ablation residues formed during aerospace reentry operations are presented. Spectral hemispherical emittance and reflectance were determined with an image pyrometer integrated with an arc-imaging furnace for carbon, graphite, zirconia, and a phenolic-nylon ablation-material char at wavelengths from 0.37 micrometer to 0.72 micrometer for temperatures from 2100 deg K to 3700 deg K. The data obtained are compared with those of other investigations to the extent that the existence of comparable data permits. Surface-roughness properties of the materials studied were determined from measurements made with a light-section microscope. The dependence of the spectral hemispherical emittance of oxidized carbon at a wavelength of 0.65 micrometer on its surface-roughness properties was investigated experimentally and the emittance was found to be a linear function of the root-mean-square slope of the surface when the roughness is large compared with wavelength. p3

Limitations: APPROVED FOR PUBLIC RELEASE
Description: Technical note
Pages: 31
Report Date: MAR 65
Report Number: A107703

Emissivity Spectra of Sulfates, Phosphate, and Chlorides

The absorption features of sulfate (gypsum and anhydrite) and phosphate (apatite) result from vibrations of the S-O and P-O bonds in the sulfate and phosphate anions, respectively. The strong ionic bonding of the chlorides inhibits independent vibration between the individual diatomic pairs (e.g., Na and Cl) but rather requires the entire crystal lattice to vibrate as a whole.

This figure is from Lane, M.D. and P.R. Christensen, Thermal infrared emission spectroscopy of salt minerals predicted for Mars, Icarus, 135, 528-536, 1998.

CLICK ON IMAGE TO ENLARGE –SOURCE: Arizona State University website: www.mars.asu.edu/~lane/sulfphoschl.html

Spectral Emittance of Particulate Ash-Like Deposits: Theoretical Predictions Compared to Experimental Measurement, Journal of Heat Transfer – April 2004 — Volume 126, Issue 2, pp. 286-289

S. P. Bhattacharya

Cooperative Research Centre for Clean Power from Lignite, 8/677 Springvale Road, Mulgrave, Victoria 3170, Australia
(Received September 11, 2002; revised July 1, 2003)

From  the Abstract: “This note presents results of a theoretical and experimental investigation on the emittance of particulate deposits.”

Source Abstract