Faculté des Sciences appliquées
Faculté des Sciences appliquées

Development of a speed measurement interface for projectiles and moving parts and accuracy analysis of these measurements

Jacoby, Jonathan ULiège
Promotor(s) : Vanderbemden, Philippe ULiège
Date of defense : 26-Jun-2017/27-Jun-2017 • Permalink :
Title : Development of a speed measurement interface for projectiles and moving parts and accuracy analysis of these measurements
Translated title : [fr] Développement d’une interface de mesure de vitesse de projectiles et de pièces mobiles et analyse de la précision de ces mesures
Author : Jacoby, Jonathan ULiège
Date of defense  : 26-Jun-2017/27-Jun-2017
Advisor(s) : Vanderbemden, Philippe ULiège
Committee's member(s) : Boigelot, Bernard ULiège
Vanderheyden, Benoît ULiège
Libotte, Hugues 
Language : English
Number of pages : 72
Keywords : [en] sensor
[en] microcontroller
[en] speed measurement interface for projectiles
[en] accuracy analysis
[en] speed measurement of moving parts inside FN MAG machine gun
[en] counting module
Discipline(s) : Engineering, computing & technology > Electrical & electronics engineering
Target public : Other
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil électricien, à finalité spécialisée en "electrical engineering"
Faculty: Master thesis of the Faculté des Sciences appliquées


[en] FN Herstal has developed for many years metrological systems specially dedicated to the gunsmith business. Among these, we will focus on speed measurement devices dedicated to projectiles and moving parts. These measurements are carried out either during the development phase, for the creation of new products, or during the production phase, in order to ensure the tuning and the quality control of the products.
The first task I needed to accomplish was the entire development, from the hardware to the software, of a counting module whose main purpose is measuring a time separating two events. I was able to build a completely functional prototype, mounted on a pre-drilled board, with a microcontroller coded in C, and equipped with the necessary interface. In addition, all customer requirements were met.
One of the applications of this module was the measurement of the average speed of a projectile, which transits through two existing speed barriers, outputting a digital signal triggered by the transit of the projectile. Once plugged to the built module, the projectile speed is correctly computed. The created module is also able to detect every possible defect that could be caused by the speed barriers.
An accuracy analysis, taking the form of an uncertainty budget of the whole package, speed barriers and counting module, was carried out. The uncertainty of the measurement is now accurately estimate and all major contributions of the error have been identified.
The last challenge was to develop a device which measures the average speed of the moving parts, inside a FN MAG machine gun, when these moving parts are going backwards (from the barrel to the butt). The prototype relies on a sensing method based on magnetic flux detection with strong magnets and Hall probes.



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  • Jacoby, Jonathan ULiège Université de Liège > Master ingé. civ. électr., à fin.


Committee's member(s)

  • Boigelot, Bernard ULiège Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Informatique
    ORBi View his publications on ORBi
  • Vanderheyden, Benoît ULiège Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes
    ORBi View his publications on ORBi
  • Libotte, Hugues FN Herstal
  • Total number of views 57
  • Total number of downloads 2

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