Technology for Elevated Temperature Tests of Structural Panels

By National Aeronautics and Space Administration

A technique for full-field measurement of surface temperature and in-plane strain using a single grid imaging technique was demonstrated on a sample subjected to thermally-induced strain. The technique is based on digital imaging of a sample marked by an alternating line array of La2O2S: Eu(+3) thermographic phosphor and chromium illuminated by a UV lamp. Digital images of this array in unstrained and strained states were processed using a modified spin filter. Normal strain distribution was determined by combining unstrained and strained grid images using a single grid digital moire technique. Temperature distribution was determined by ratioing images of phosphor intensity at two wavelengths. Combined strain and temperature measurements demonstrated on the thermally heated sample were DELTA-epsilon = +/- 250 microepsilon and DELTA-T = +/- 5 K respectively with a spatial resolution of 0.8 mm.Thornton, E. A.Langley Research CenterHIGH TEMPERATURE; TEMPERATURE MEASUREMENT; THERMOGRAPHY; TEMPERATURE DISTRIBUTION; TEMPERATURE EFFECTS; STRAIN MEASUREMENT; PLANE STRAIN; DIGITAL TECHNIQUES; IMAGING TECHNIQUES; SPATIAL RESOLUTION; CHROMIUM; PHOSPHORS; MOIRE EFFECTS; LANTHANUM OXIDES; EUROPIU

• Format: Paperback
• Language: English
• ISBN: 1723894117
• ISBN13: 9781723894114
• Release Date: January 1
• Publisher: Independently Published
• Length: 54 Pages
• Weight: 0.33 lbs.
• Dimensions: 0.1" x 8.5" x 11.0"