Separation of vibration fringe data from rotating object fringes in pulsed ESPI

Carlos Perez-Lopez; Fernando Mendoza Santoyo; Ramon Rodriguez-Vera

doi:10.1117/12.386755

22 May 2000 Separation of vibration fringe data from rotating object fringes in pulsed ESPI

Carlos Perez-Lopez, Fernando Mendoza Santoyo, Ramon Rodriguez-Vera

Proceedings Volume 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2000) https://doi.org/10.1117/12.386755
Event: 4th International Conference on Vibration Measurement by Laser Techniques, 2000, Ancona, Italy

Abstract

An unbalanced object that rotates may present a characteristic vibration amplitude at an specific frequency. Pulsed electronic speckle pattern interferometry is a non- destructive electro-optical technique well suited to study this rotating-vibrating object. Fringe data is initially qualitatively analyzed while being observed in real time on a TV monitor, and later quantitative data can be extracted using one of several methods reported in the literature. However, if an object derotator is not available the resulting fringes are composed of a mixture of rotation and vibration fringes, making of a qualitative and quantitative analysis an almost impossible task. The present paper proposes a method to separate the fringes due to rotation from those produced solely by vibration. The method is based on a high precision scheme that synchronizes and fixes an object point during rotation, and assumes a resonant mode of object vibration.

Citation Download Citation

Carlos Perez-Lopez, Fernando Mendoza Santoyo, and Ramon Rodriguez-Vera "Separation of vibration fringe data from rotating object fringes in pulsed ESPI", Proc. SPIE 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2000); https://doi.org/10.1117/12.386755

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