2 Non-contact Measurement of Strains Using Two Orthogonal Sets of Twin “Blue” Lasers 13 Fig. 2.5 Processing steps in MATLAB routine used to determine the tube full circumference from four-laser measurement In Fig. 2.7a, when the tube was heated at 600 ◦C, the results of analysis of the tube circumference as shown in the plot below showed that some creep strain (~4% of hoop strain) was detected and the profile of the circumference remained circular. A circular profile suggests that the creep deformation occurred uniformly all around the circumferential location of the tube.
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