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Damage Detection by Wave Propagation Observation with Laser SpeckleInterferometry
Author(s) -
Schmidt Alexander,
Lammering Rolf,
Plenge Michael
Publication year - 2005
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200510157
Subject(s) - electronic speckle pattern interferometry , holography , optics , interferometry , holographic interferometry , speckle pattern , acoustics , laser , vibration , shearography , fault detection and isolation , materials science , computer science , physics , artificial intelligence , actuator
Abstract For quality insurance and fault detection, one and three dimensional ESPI (Electronic Speckle Pattern Interferometry) technique is applied to various structures. These experiments are an extension of previous experiments with Holographic Interferometry [4], a related measurement technique. ESPI is a non contact, high resolution Laser measurement technique. It facilitates transient full field vibration measurements that deliver absolute deflections, either one dimensional out‐of‐plane or three dimensional in and out‐of‐plane. Experiments have been performed with a full scale concrete embedded track segment. Different known artificial defects represent various flaws and voids due to the fabrication process and operation. Wave propagation due to impact is observed and allows for damage detection. ESPI measurements are in good accordance with expectations. An in‐situ measurement setup for quality management of concrete embedded railway tracks has been built. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)