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13 December 1983 The Use Of Heterodyne Speckle Photogrammetry To Measure High-Temperature Strain Distributions
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Proceedings Volume 0370, Holographic Data Nondestructive Testing; (1983)
Event: Holographic Data Nondestructive Testing, 1982, Dubrovnik, Croatia
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.
© (1983) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Karl A. Stetson "The Use Of Heterodyne Speckle Photogrammetry To Measure High-Temperature Strain Distributions", Proc. SPIE 0370, Holographic Data Nondestructive Testing, (13 December 1983);

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