TY - CONF A1 - Maierhofer, Christiane A1 - Myrach, Philipp A1 - Röllig, Mathias A1 - Steinfurth, Henrik T1 - Validation of active thermography techniques for the characterization of CFRP structures T2 - ECNDT 2014 - 11th European conference on non-destructive testing (Proceedings) N2 - Lockin thermography as well as flash thermography are very well suited for non-destructive testing and characterisation of inhomogeneities and damage in CFRP structures. Both methods are applied more and more in research and industry, but until know it is not clear which are the advantages of one method against the other. In this paper, results of two research projects concerning the validation and standardisation of both methods are presented. Three different types of CFRP test specimens consisting of well-defined flat bottom holes, of artificial delaminations made of PTFE plates embedded in CFRP and of real impact damage have been investigated systematically with flash and lockin excitation. Here, the phase images of both methods are compared qualitatively as well as quantitatively. T2 - ECNDT 2014 - 11th European conference on non-destructive testing CY - Prague, Czech Republic DA - 06.10.2014 KW - Active thermography KW - Flash KW - Lockin KW - CFRP KW - Flat bottom holes KW - Delamination KW - Impact damage PY - 2014 UR - http://www.ndt.net/events/ECNDT2014/app/content/Paper/199_Maierhofer_Rev2.pdf SN - 978-80-214-5018-9 SP - Paper 199, 1 EP - 10 AN - OPUS4-31940 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Myrach, Philipp A1 - Steinfurth, Henrik A1 - Reischel, Mercedes A1 - Röllig, Mathias T1 - Development of standards for flash thermography and lock-in thermography T2 - QIRT 2014 - 12th International conference on quantitative infrared thermography (Proceedings) N2 - Standards for the application of flash thermography as well as of lock-in thermography are urgently required. Both methods are applied more and more often in research and industry, but still extensive validation procedures are required for each individual application. In this paper, the results of two research projects concerning the validation and standardisation of both methods are presented. This includes results of a detailed study of the influence of measurements parameters on flash thermography, of the comparison of the lateral resolution obtained with flash and lock-in thermography and the description of a draft standard for flash thermography. T2 - QIRT 2014 - 12th International conference on quantitative infrared thermography CY - Bordeaux, France DA - 07.07.2014 KW - Active thermography KW - Flash KW - Lockin KW - CFRP KW - Metal KW - Standardization PY - 2014 UR - http://qirt.gel.ulaval.ca/archives/qirt2014/QIRT%202014%20Papers/QIRT-2014-032.pdf DO - https://doi.org/10.21611/qirt.2014.032 SP - 1 EP - 9 AN - OPUS4-31187 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -