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We use non-destructive Digital Holographic Speckle Pattern Interferometry (DHSPI), post-processing image analysis and one-dimensional exponential analysis to visualize, map and describe the structural condition of a plaster-based material. The body is heated by infrared radiation for two different time windows and the cooling process that follows is monitored in time by the so-called interferograms that are developed and are the result of the superposition of the holographic recordings of the sample prior to the thermal load and at variable time intervals during the cooling process. The fringe patterns in the interferometric images reveal features and characteristics of the interior of the material, with the experimental method and the post-process analysis adopted in this work offering accuracy, sensitivity and full-field diagnosis, in a completely non-destructive manner, without the need of sampling.
Details
Plasters;
Holography;
Humidity;
Nondestructive testing;
Experimental methods;
Infrared radiation;
Infrared analysis;
Plaster;
Infrared imagery;
Image processing;
Dimensional analysis;
Composite materials;
Condition monitoring;
Image analysis;
Thermal analysis;
Interferometry;
Speckle patterns;
Pattern analysis;
Lasers;
Energy efficiency;
Engineering;
Windows (intervals);
Diffraction patterns;
I.R. radiation;
Cultural heritage;
Electronic speckle pattern interferometry
1 Department of Mechanical Engineering, School of Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece
2 Institute of Electronic Structure and Laser IESL, Foundation for Research and Technology-Hellas FORTH, 70013 Heraklion, Greece;