<title>Three-dimensional pulsed ESPI technique of analysis of dynamic problems</title>

Abstract

Pulsed ESPI techniques have been developed during the last years to replace conventional double pulse holography interferometer for analysis of dynamic behavior of components. The main benefits of holography towards conventional measuring techniques have already been known as field and non-contact measurement results. Recent developments have extended the capabilities of pulsed ESPI techniques to 3D measurement of dynamic behavior. The object under investigation is illuminated with the light of a pulsed laser and simultaneously observed from 3 different directions with 3 ESPI cameras. The measuring results from the 3 cameras are representing the deformation field in the 3 sensitivity directions of the optical set-up. The optical image distortion due to the different viewing angles of the 3 cameras is automatically compensated and the complete 3D-deformation vector is calculated on every point of the inspected surface. Recent industrial applications of the 3D pulsed ESPI technique have been identified and carried out in the field of automotive NVH applications, aerospace and railway technique.