In this work, we introduce a new algorithm for effectual crack detection using flying line laser thermography, based on the well-known Canny approach. The transforms input thermographic sequence into an edge map. Experimental measurements are performed metallic component that contains surface breaking cracks due to industrial use. specimen is tested thermography at different scanning speeds and...

POROUS STONE N.P. Avdelidis, E.T. Delegou, and A. Moropoulou 1 IRT & Materials Consultancy, Volos, Greece; 2 National Technical University of Athens, Athens, Greece Abstract: In this work, infrared thermography was employed as a monitoring technique during water capillary rise tests on a choice of porous stones in the laboratory, as well as in situ on a cleaned porous stone surface of a histori...

Using lock-in thermography the temperature resolution of a Focal Plane Array (FPA) thermocamera can be improved down to 40 μK after 1000 s measuring time. This allows the detection of even weak heat sources (hot spots) in electronic devices. The technical realization of lock-in thermography is described here with typical applications to the investigations of shunts in solar cells and localizati...

The defect detection capabilities of transient thermography and shearography have been compared using optimum excitation methods for each technique: short pulse heating for thermography and vibration excitation using a piezoelectric transducer for shearography. A signal-to-noise ratio and limit of detection analysis has been performed on defect images obtained by the two techniques using the di...

− Lock-in and pulse phase infrared thermography measurement techniques have been exploited for quantitative assessment of subsurface defects in a reference specimen made of Plexiglas. Radiometric thermal images were post-processed using a contrast approach in the frequency domain, allowing defect depth location to be resolved with a relative combined standard uncertainty of about 7% for thickne...

Two compression algorithms for the image sequences generated by pulsed-transient thermography for non-destructive testing were developed. The first algorithm allows to balance the quality of the original measurement data reproduction against the compression ratio. This algorithm comprises a dedicated space/time mapping (STM) method and an image compression algorithm (JPEG2000). The second algor...

Vasculitis is a clinical condition with associated diagnostic challenges due to nonspecific symptoms and lack of a confirmatory imaging modality. We report a case of a 39-year-old female patient who developed generalized malaise, lethargy, and headache. Laboratory evaluation showed elevated inflammatory markers. Conventional imaging studies including computed tomography and carotid duplex ultra...

The inspection of aerospace materials such as composites, honeycomb structures, ceramics and GLARE has been the subject of many studies in the NonDestructive Testing and Evaluation (NDT&E) community. Active thermography techniques have shown to be an interesting alternative or complementary to other classical NDT&E techniques. Nevertheless, the different techniques perform differently depending...

Macropores and water flow in soils and substrates are complex and are related to topics like preferential flow, nonequilibrium flow, and dual-continuum. Hence, the quantification of the number of macropores and the determination of their geometry are expected to provide a better understanding on the effects of pores on the soil's physical and hydraulic properties. This exploratory study aimed a...