The Use Of Heterodyne Speckle Photogrammetry To Measure High-Temperature Strain Distributions

Karl A. Stetson

doi:10.1117/12.934871

13 December 1983 The Use Of Heterodyne Speckle Photogrammetry To Measure High-Temperature Strain Distributions

Karl A. Stetson

Proceedings Volume 0370, Holographic Data Nondestructive Testing; (1983) https://doi.org/10.1117/12.934871
Event: Holographic Data Nondestructive Testing, 1982, Dubrovnik, Croatia

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.

Citation Download Citation

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); https://doi.org/10.1117/12.934871

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