Metrological approach of new sensors used in structural health monitoring
Approche métrologique pour les nouveaux capteurs dédiés au contrôle de santé des structures
Résumé
The rise of new technologies and the use of new sensors in structural health monitoring rise from a need increasing for knowledge and sounding in real time of constructions in the civil engineering. Safety requires the reliability of the results and the answers given by the sensors. In this context it is essential to carry out thorough metrological studies making it possible to extract uncertainty associated with the result according to the need and the context of use, in order to better evaluate the degree of confidence according to the requirements one fixed. The metrological studies can be done with various methods according to the situation and to the nature of measurements. Indeed currently the international reference for the calculation of uncertainties is the famous GUM "Guides to the expression of uncertainty in measurement" published in 1993 which proposes a procedure of evaluation and expression of uncertainty called analytical approach. It is currently the most traditional method of reference. But as uncertainty touches now with all the measurable sizes and that the processes of measurement are increasingly complex and the settings in equations of all the components of uncertainty become difficult even impossible, in order to stage with this problem several laboratories have worked for a few years on a classification of four methods, the first is the traditional method based on the GUM, the second approach consists in composing the uncertainties estimated starting from the characteristics of the method. The third method consists in using the values of fidelity of a method published in the exit of interlaboratories comparison and finally the last uses theses intercomparisons to determine the performance of a laboratory. The two first approaches are applied inhouse in only one laboratory whereas the two last are applied when several laboratories intervene.
Domaines
Physique [physics]
Origine : Fichiers produits par l'(les) auteur(s)