Target Phenomenology. Task 3 - Experimental Determination of the Infrared Spectral Optical Properties of Bulk and Powdered Aluminum Oxide.
Abstract
A comparison of sample preparation, measurement techniques and optical property data for bulk and powdered aluminum oxide is made to determine the infrared complex spectral refractive index. Normal transmittance of single crystal sapphire from 1 to 9 micrometers was measured at temperatures between 293 and 2000 K. Spectral emittance of flame sprayed powder was measured at 1000, 1500 and 2000 K and used with diffuse spectral reflectance measurements to calculate the extinction index and refractive index from Kubelka-Munk and Fresnel theory. The relatively large difference in effective absorption coefficient between bulk and powder materials is shown at wavelengths from 10.5 to 22.0 micrometers. The calculated extinction index exhibited typical increases with temperature but was found to be greater than previously reported beyond 6 micrometers. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1973
- Accession Number
- AD0910500
Entities
People
- Chang K. Liu
- Elmer R. Streed
- George R. Cunnington
Organizations
- Lockheed Martin Missiles and Space