Short Course

Basic of IR Thermography I, II

Prof. Xavier Maldague
Laval University, Canada

Abstract: The course is aimed to be an introduction to infrared thermography, especially for NonDestructive
Testing although other applications are discussed also. It is divided into two parts presenting the fundamental principles (Part A) and procedures/applications in Part B. Obviously it is not possible to cover in deep details the whole material but the participants will get a good idea of the potentialities and limitations in various contexts. Details are available in references.

Thermography application to Cultural Heritage and buildings

Dr. Paolo Giulio Bison
Consiglio Nazionale delle Ricerche, Italy

Abstract: In this short course the basics of IR thermography will be reviewed at the beginning, considering the basic physiscs principles involved in the emission, trasmission and detection of IR radiation. Later on, the basic principles related to the use of IR thermography as a Non-Destructive technique will be briefly mentioned, together with the very basic principles of the heat conduction in solid materials. After that, the course will describe some applications of IR thermography related to Cultural Heritage. Passive and active thermography applications will be described to identify inner structures, detachments of frescoes and humidity presence in porous materials. The solar loading will be considered as a source of heat in the identification of defects on facades of ancient buildings. Some application related to the microclimate and comfort assessment will be considered as well. The analysis of ancient books and documents to recover the hidden writings will be described. Finally some classical application of IR thermography to buildings will be presented, focusing on the evaluation of thermal bridges and of air leakges.

IR inspection of infrastructures: Scope of application, technical solutions and analysis methods

Dr. Jean Dumoulin
IFSTTAR / Inria, France

Abstract: Overall objectives of this short course is to give some theoretical and practical basis to facilitate a critical analysis of results that can be obtained by the implementation of infrared thermography (IRT) for Civil Engineering structures inspection.
We will first give and analyze some examples of thermal signature in presence of faulting area (of different nature) in a supposed homogeneous (or layered) structure submitted to thermal excitation. To complete this introduction, we will give an overview of some typical real defects that can be detected by using infrared thermography in active mode or under natural solicitations.
In a second time, we will detailed existing standard, but also IR system requirements for in-situ Non Destructive Testing (NDT) on structures. Two “Active” Infrared Thermography approaches will be then examined and analyzed: Square Pulse Thermography and Long term thermal monitoring under Natural Solicitations (also mentioned in literature as IR-UTD “InfraRed Ultra Time Domain”).
In a third time, to go deeper in the comprehension of involved Physical phenomenon, we will get back to heat transfer equation and examined some characteristic physical parameters (for instance: Diffusion Time, Thermal Effusivity, …). The notion of “Thin” and “Thick” wall will be introduced and consequences on active infrared thermography strategies for NDT approaches implementation and limitations will be presented.
Finally, some classical thermal images post-processing analysis approaches, ranging from signal and image domain to inverse thermal method, will be examined and discussed.
This short course will conclude on positioning IR approach versus other NDT techniques in such scope of application. Perspectives issued from recent research results will be mentioned at the end of this short course.