Quantitative Strain Measurement Through Holographic Interferometry

R. Dandliker; B. lneichen

doi:10.1117/12.955309

10 April 1977 Quantitative Strain Measurement Through Holographic Interferometry

R. Dandliker, B. lneichen

Proceedings Volume 0099, 3rd European Electro-Optics Conf; (1977) https://doi.org/10.1117/12.955309
Event: Third European Electro-Optics Conference, 1976, Geneva, Switzerland

Abstract

The basic problems of quantitative determination of mechanical strain through holographic interferometry are discussed. A solution based on the calculation of local derivatives ofthe holographically recorded surface displacements is described. This method uses essentially heterodyne holographic interferometry for the quantitative determination of the surface displacement from the fringe pattern in the image plane. With this techqque the interference phase can be measured with an accuracy and reproducibility of ± 0.33at any point in the fringe pattern, corresponding to an interpolation of better than 10-3 of one fringe-Numerical examples are given for the sensitivity and accuracy of surface strain measurements and the determination of bending and torsion. Experimental results for bending and torsion of arbitrarily curved and twisted space beams, such as turbine blades, are reported. Accuracy and agreement with theory are within a few percent.

Citation Download Citation

R. Dandliker and B. lneichen "Quantitative Strain Measurement Through Holographic Interferometry", Proc. SPIE 0099, 3rd European Electro-Optics Conf, (10 April 1977); https://doi.org/10.1117/12.955309

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