THERMOGRAPHIC PROFILES OF MATERIAL DISCONTINUITIES
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 cal/sqcm/sec/degree C/sec can be examined by this method. Metals and non-metals with k values above 0.1 cal/sqcm/sec/degree C/sec 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1961
- Accession Number
- AD0266801
Entities
People
- David K. Wilburn
Organizations
- United States Army Tank Automotive Research, Development and Engineering Center