| Olga Wysocka-Fotek, PhD |
 |
Doctoral thesis
| 2012-09-27 | Szacownie wielkości i położenia defektów podpowierzchniowych za pomocą impulsowej termografii podczerwieni
| 653 |
Recent publications
| 1. | Wysocka-Fotek O., Maj M., Oliferuk W.♦, Use of pulsed IR thermography for determination of size and depth of subsurface defect taking into account the shape of its cross-section area, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.1515/amm-2015-0181, Vol.60, No.2, pp.615-620, 2015 Abstract: The paper is devoted to reconstruction of size and depth (distance from the tested surface) of artificial defects with square and rectangular cross-section areas using the pulsed IR thermography. Defects in form of flat-bottom holes were made in austenitic steel plate. The defect size was estimated on the basis of surface distribution of the time derivative of the temperature. In order to asses the depth of defects with considered geometries on the basis of calibration relations (i.e. dependence of time of contrast maximum vs. defect depth for given defect diameter) obtained for circular defects, the ‘equivalent diameter’ describing not only the defect cross-section area but also its shape was assigned. It has been shown that presented approach gives satisfactory results. Keywords:pulsed IR thermography, defect size, defect depth, cross-section shape of defect Affiliations:
| | |||||||||
| 2. | Wysocka-Fotek O., Oliferuk W., Maj M., Reconstruction of size and depth of simulated defects in austenitic steel plate using pulsed infrared thermography, INFRARED PHYSICS AND TECHNOLOGY, ISSN: 1350-4495, DOI: 10.1016/j.infrared.2012.02.004, Vol.55, pp.363-367, 2012 Abstract: In this paper the size and depth (distance from the tested surface) of defects in austenitic steel were estimated using pulse infrared thermography. The thermal contrast calculated from the surface distribution of the temperature is dependent on both these parameters. Thus, two independent experimental methods of defect size and depth determination were proposed. The defect size was estimated on the basis of surface distribution of the time derivative of the temperature, whereas the defect depth was assessed from the dependence of surface thermal contrast vs. cooling time. Keywords:pulsed IR thermography, temperature time derivative, defect size, thermal contrast, defect depth Affiliations:
|  | |||||||||
| 3. | Wysocka-Fotek O., Oliferuk W., Maj M., Use of pulse IR thermography for detection and quantitative description of subsurface defects in austenitic steel, RUDY I METALE NIEŻELAZNE, ISSN: 0035-9696, Vol.54, No.11, pp.684-687, 2009 Abstract: Pulsed IR thermography is a non-destructive testing method that allows detection of subsurface defects in material. In this method the surface of the tested specimen is stimulated by heat pulse and its self-cooling process is analyzed. The temperature decrease rate is different for surface over defect with comparison to that over the sound material. It is caused by difference between values of heat diffusivity of defected zone and sound one. The purpose of this work is to determine the size and depth of the defects in austenitic steel on the basis of thermal contrast analysis. Because the thermal contrast is dependent on both these parameters, two independent experimental methods of defect size and depth determination were proposed. Keywords:pulsed thermography, thermal contrast, defect characterization Affiliations:
| |