Evaluation of phase changes of interferograms during continuous deformations

Torgny E. Carlsson; Wei An

doi:10.1117/12.498449

7 March 2006 Evaluation of phase changes of interferograms during continuous deformations

Torgny E. Carlsson, Wei An

Proceedings Volume 4101, Laser Interferometry X: Techniques and Analysis; (2006) https://doi.org/10.1117/12.498449
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

A method for measurement of continuous displacements and deformations is presented. The method may be used in e.g. speckle interferometry, moire, structured light and other optical measurement methods based on evaluation of phase changes. The initial random phase of the interference pattern is either known or evaluated before displacement take place using e.g. phase shifting. The changing phase thereafter is achieved only from one image at a time by a least square algorithm. The technique can be used for measuring shape deformations such as transients and other dynamic events, heat expansion as well as other phenomena where it is difficult to accomplish phase shifting during deformation.

Citation Download Citation

Torgny E. Carlsson and Wei An "Evaluation of phase changes of interferograms during continuous deformations", Proc. SPIE 4101, Laser Interferometry X: Techniques and Analysis, (7 March 2006); https://doi.org/10.1117/12.498449

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