DEFORMATION MEASUREMENT METHOD AND DEVICE USING ELECTRONIC SPECKLE INTERFEROMETRY

摘要

PURPOSE: To provide a method and a device used for accurately measuring dynamic deformation, vibration, distortion or the like of an observing object by using an electronic speckle interferometry, and capable of facilitating a phase unlapping process to an extent allowing detection of a connection point of a phase change curve to be automated in executing the phase unlapping process of the phase change curve in a time domain. CONSTITUTION: This method comprises: a step 32 for calculating the cosine component of strength by subtracting the average strength from strength in the time domain of every point of a speckle pattern image; a step 33 for calculating the sine component of the strength by applying a Hilbert transformation process in the time domain to the cosine component; a step 34 for finding the arctangent of a ratio of the calculated cosine component to the calculated sine component to determine an object phase; a step 35 for executing an unlapping calculation process; and a step 36 for outputting three-dimensional deformation distribution data in a displayable form.