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The rapid estimation of the damage of a composite plate is possible with thermal methods. Such methods have been improved with the use of high performance based on focal plane array of quantum detectors (Jade III from CEDIP) and suitable processing methods. Such processing methods consist in associating the experimental advantage of the flash method and some characteristics of periodic methods related to the processing of a great quantity of data. The main idea is to use as reference transient signal the spatially averaged image evolution. Some practical aspects of the method applied to the estimation of delamination characteristics are presented. The experiments are obtained from damaged composite plates (transparent fibre glass epoxy sample covered with a black painting).