Building defect detection: External versus internal thermography

Defect detection in ceramic materials by quantitative infrared thermography

In this paper infrared (IR) measurements and dedicated signal processing algorithms were developed and applied for defect detection on green ceramic tiles. Tiles with defects having known dimension and position were realized and tested by acquiring either heating and cooling transients of the tile subjected to thermal pulse excitation. As rarely defects appear directly in the thermal map, post-...

Defect Detection within a Pipe Using Ultrasound Excited Thermography

Thermal wave infrared imaging for detecting defects in a material has been carried out with high-power ultrasonic sources. An early example of this was the work by Mignogna et al, who utilized a high-power ultrasonic heating of a material, coupled with an imaging by means of an infrared (IR) camera [1]. The time scale for their IR images was several seconds after the application of an ultrasoni...

Defect Detection in Composite Materials by Thermography and Neural Networks

Advanced composite materials offer high structural performances with a remarkable lightness and are used in all fields where this quality is particularly recommended (aeronautics, navy, car manufacturing, etc.). The increasing diffusion of these materials has led to the need for the control of the manufacturing processes and to the wide use of inspections of structural integrity conditions, dur...

JOHN DILWORTH Internal versus External Representation

Generalized expectancies for internal versus external control of reinforcement.

The effects of reward or reinforcement on preceding behavior depend in part on whether the person perceives the reward as contingent on his own behavior or independent of it. Acquisition and performance differ in situations perceived as determined by skill versus chance. Persons may also differ in generalized expectancies for internal versus external control of reinforcement. This report summar...