Int. J. Metrol. Qual. Eng.
Volume 5, Number 2, 2014
|Number of page(s)||9|
|Published online||09 October 2014|
Quantification of the uncertainties of high-speed camera measurements
1 Royal Military Academy, Department of
Weapons Systems and Ballistics, 30
avenue de la Renaissance, 1000
2 University of Liège (ULg), Aerospace & Mechanical Engineering Department (LTAS), 1, Chemin des Chevreuils, 4000 Liège, Belgium
3 Polytechnic Military School of Algiers (EMP), Algeria, 5 Bordj El Bahri, Algiers, Algeria
Accepted: 9 June 2014
This article proposes a combined theoretical and experimental approach to assess and quantify the global uncertainty of a high-speed camera velocity measurement. The study is divided in five sections: firstly, different sources of measurement uncertainties performed by a high-speed camera are identified and quantified. They consist of geometrical uncertainties, pixel discretisation uncertainties or optical uncertainties. Secondly, a global uncertainty factor, taking into account the previously identified sources of uncertainties, is computed. Thirdly, a sensibility study of the camera set-up parameters is performed, allowing the experimenter to optimize these parameters in order to minimize the final uncertainties. Fourthly, the theoretical computed uncertainty is compared with experimental measurements. Good concordance has been found. Finally, the velocity measurement uncertainty study is extended to continuous displacement measurements as a function of time. The purpose of this article is to propose all the mathematical tools necessary to quantify the individual and global uncertainties, to highlight the important aspects of the experimental set-up, and to give recommendations on how to improve a specific set-up in order to minimize the global uncertainty. Taking all these into account, it has been shown that highly dynamic phenomena such as a ballistic phenomenon can be measured using a high-speed camera with a global uncertainty of less than 2%.
Key words: High-speed camera / uncertainties / velocity measurement / displacement measurement / ballistics
© EDP Sciences 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.