Thermal (2-5.6 µm) Emittance Of Diathermanous Materials As A Function Of Optical Depth, Critical Angle And Temperature

R. H. Munis; S. J. Marshall

doi:10.1117/12.945025

21 January 1985 Thermal (2-5.6 µm) Emittance Of Diathermanous Materials As A Function Of Optical Depth, Critical Angle And Temperature

R. H. Munis, S. J. Marshall

Author Affiliations +

Proceedings Volume 0510, Infrared Technology X; (1985) https://doi.org/10.1117/12.945025
Event: 28th Annual Technical Symposium, 1984, San Diego, United States

Abstract

Thermal (2.0 μ - 5.6 μm) measurements of the normal emittance (EN) of several diathermanous materials were made at 15.2°C, 4.9°C and -5.6°C. Calculations of the total hemis-pherical emittance (EH) were made from EN and plotted against the optical depth (YΔλx). A comparison of these data with a model proposed by Gardon indicates that at near-ambient temperatures they agree very closely. It has been observed that EN > EH by ≈ 5% for both weakly and strongly absorbing materials. This is attributable to phase differences in the multiply reflected internal radiation attempting to exit the specimen throughout π steradians. Other radiation properties of the materials, i.e. diffuse transmittance (TD), absorption coefficient yΔx, and absorption index k were calculated.

Citation Download Citation

R. H. Munis and S. J. Marshall "Thermal (2-5.6 µm) Emittance Of Diathermanous Materials As A Function Of Optical Depth, Critical Angle And Temperature", Proc. SPIE 0510, Infrared Technology X, (21 January 1985); https://doi.org/10.1117/12.945025

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
13 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Absorption

Thermography

Data modeling

Transmittance

Imaging systems

Temperature metrology

Sensors

Show All Keywords

Keywords/Phrases

Search In:

Publication Years