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Proceedings Paper

The Use Of Heterodyne Speckle Photogrammetry To Measure High-Temperature Strain Distributions
Author(s): Karl A. Stetson
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Paper Abstract

Thermal and mechanical strains have been measured on samples of a common material used in jet engine burner liners, which were heated from room temperature to 870°C and cooled back to 220°C, in a laboratory furnace. The physical geometry of the sample surface was recorded at selected temperatures by means of a set of twelve single-exposure speckle-grams. Sequential pairs of specklegrams were compared in a heterodyne interferometer which allowed high-precision measurement of differential displacements. Good speckle correlation was observed between the first and last specklegrams also, which showed the durability of the surface microstructure, and permitted a check on accumulated errors. Agreement with calculated thermal expansion was to within a few hundred microstrain over a range of fourteen thousand.

Paper Details

Date Published: 13 December 1983
PDF: 10 pages
Proc. SPIE 0370, Holographic Data Nondestructive Testing, (13 December 1983); doi: 10.1117/12.934871
Show Author Affiliations
Karl A. Stetson, United Technologies Research Center (United States)

Published in SPIE Proceedings Vol. 0370:
Holographic Data Nondestructive Testing
Dalibor Vukicevic, Editor(s)

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