Accession Number:

AD0266801

Title:

THERMOGRAPHIC PROFILES OF MATERIAL DISCONTINUITIES

Descriptive Note:

Corporate Author:

ARMY TANK-AUTOMOTIVE CENTER WARREN MICH

Personal Author(s):

Report Date:

1961-03-01

Pagination or Media Count:

1.0

Abstract:

An infrared line scan radiometer was utilized to obtain thermal patterns representative of interior discontinuities in solids of low heat conductivity. Temperature differences as low as 0.6 C could be detected with a theoretical resolution of 0.031 inches. Non-metals with thermal conductivity k, below 0.01 calsqcmsecdegree Csec can be examined by this method. Metals and non-metals with k values above 0.1 calsqcmsecdegree Csec dissipate surface thermal gradients too rapidly to produce a sufficient temperature difference for detection. The radiometer system is evaluated with respect to parameters of frame time, bandwidth and sample distance. Typical thermograms are presented for a variety of insulating and other low k value materials. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE