Real-time displacement and vibration measurements using a spatial phase-shifting technique

Suezou Nakadate; Masaki Isshiki

doi:10.1117/12.269828

20 March 1997 Real-time displacement and vibration measurements using a spatial phase-shifting technique

Suezou Nakadate, Masaki Isshiki

Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269828
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore

Abstract

Real-time displacement and vibration measurements are presented, Which are based on a spatial phase-shifting with a tilt holographic interferogram. Three intensity data sampled at every one-third of the fringe spacing of the tilt fringes are used to calculate the phase and the modulation term of the fringe which are functions of a displacement and a vibration amplitude, respectively. Three-dimensional look-up tables perform the calculations in a TV repetition rate to give a phase distribution and a new fringe profile which contours the vibration amplitude. Experimental results are given in two cases of a displacement measurement for a cantilever-like object and a vibration measurement at resonant frequencies of a flat speaker.

Citation Download Citation

Suezou Nakadate and Masaki Isshiki "Real-time displacement and vibration measurements using a spatial phase-shifting technique", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269828

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