Michèle Désenfant

Michèle Désenfant
Laboratoire National de Métrologie et d'Essais · Statistics and metrology

About

23
Publications
7,103
Reads
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124
Citations
Citations since 2016
7 Research Items
78 Citations
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2016201720182019202020212022051015

Publications

Publications (23)
Article
A specific study was designed and carried out at the Loire River Basin in France, in order to estimate the measurement uncertainty, including the contribution of sampling. Following recommendations from the Eurachem Guide on Uncertainty arising from sampling, the duplicate method was selected. The study was conducted in 2017 under routine and opera...
Article
In this paper, the authors introduce additional methods to the mainstream GUM Guide to the expression of uncertainty in measurement for testing laboratories, namely methods based on repeatability or reproductibility and trueness approaches. These methods comply with the concepts and recommendations of the GUM. The additional methods are introduced...
Article
Full-text available
In order to verify that the protocols used for water quality monitoring of surface waters within the Long-term Environmental Research Monitoring and Testing System (OPE), located in the north-eastern part of France in relation with a geological disposal for radioactive waste project, are fit for purpose, a validation study was conducted following t...
Conference Paper
Full-text available
Pour certains modèles, réduire la variance d'une ou plusieurs variables d'entrée provoque une augmentation de la variance de la sortie du modèle. Ce phénomène n'est pas concevable dans le cadre des modèles linéaires décrits par le GUM, mais peut être, en revanche, observable par propagation des distributions sur des modèles non-linéaires. Dans tous...
Article
Full-text available
This paper discusses the effects following the implementation of the concept of calibration presented in the 3rd edition of the international vocabulary of metrology—basic and general concepts and associated terms (VIM) and the repercussions of practitioners adopting VIM3. The new definition leads to modifications in the treatment of calibration da...
Article
Full-text available
In the nuclear field, the accuracy and comparability of analytical results are crucial to insure correct accountancy, good process control and safe operational conditions. All of these require reliable measurements based on reference materials whose certified values must be obtained by robust metrological approaches according to the requirements of...
Article
Full-text available
The objective of this paper was to demonstrate how multivariate statistics combined with the analysis of variance could support decision-making during the process of redesigning a water quality monitoring network with highly heterogeneous datasets in terms of time and space. Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA)...
Chapter
The certified reference materials (CRMs) are among the most appropriate tools for the traceability and validation of analytical methods. Although their number seems to be high 20,000, they only cover a small part of the analytical needs for environmental monitoring. Until now, none were available for analyzing pesticides in water. After an intralab...
Chapter
There has been a strong increase in proficiency testing (PT) as a powerful tool to the quality assessment of testing and measurement activities. Many providers propose Interlaboratory Comparisons in various domains such as environment agri-food and health. In the classical former methods exploitation of results enabled the evaluation of each partic...
Chapter
Full-text available
The supplement 1 to the GUM, dealing with the evaluation of uncertainty using the propagation of distributions, will be published this year. This supplement, based on a Monte Carlo method (MCM), allows us to deal with the evaluation of uncertainty even when the hypotheses of the law of propagation of uncertainty (LPU) are not verified. We describe...
Article
Various methods and tools are now available to evaluate measurement uncertainty. These new methods comply with the concepts and recommendations of the Guide to the expression of uncertainty in measurement (GUM). In this paper, the authors introduce several alternatives for laboratories, notably those based on intra-laboratory and interlaboratory ap...
Article
Full-text available
Using techniques for the propagation of distributions to estimate uncertainties is becoming increasingly popular in metrology. Here we describe the calculation for the estimation of uncertainties in hygrometry using this method. This work is based on investigations on the two-temperature moist gas generator at Laboratoire National d'Essais. After a...
Article
Full-text available
Basic concepts and implementations of the model-based approach to uncertainty evaluation are discussed. One implementation is that of the law of propagation of uncertainty with the use of the central limit theorem as recommended in the Guide to the expression of uncertainty in measurement (GUM). Another is the propagation of distributions, the subj...
Article
Full-text available
The certified reference materials (CRMs) are among the most appropriate tools for the traceability and validation of analytical methods. Although their number seems to be high i.e. 20 000, they only cover a small part of the analytical needs for the environmental monitoring. Until now, none were available for analysing pesticides in waters. After a...
Article
Full-text available
Résumé Les essais d'aptitude (PT) connaissent un développement important car ils permettent d'évaluer et d'assurer la qualité des prestations d'essais et de mesures. Différentes organisations proposent des circuits de comparaisons inter laboratoires dans de nombreux secteurs tels que l'environnement, l'agroalimentaire et la santé. Jusqu'à présent l...

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