Detection system suitable for identifying and tracking...

G - Physics – 01 – V

Patent

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Details

G01V 15/00 (2006.01) F16L 1/11 (2006.01) G06K 19/06 (2006.01)

Patent

CA 2654066

The invention relates to a detection system suitable for identifying and tracking buried pipes or other bodies buried in the ground or embedded in civil engineering works, which comprises: a coding device affixed to or integrated into the objects (1), taking the form of a succession of thin coding elements (3), each forming a surface of predetermined size, these elements being separated from one another, and their arrangement making it possible to define a code; and a detection device comprising at least one transmission coil (5), at least one reception coil (6) and a signal processing device for processing the signals coming from the various coils (5, 6), characterized in that at least some of the coding elements (3) are made of magnetic material, the detection device being designed to saturate or modify the point of operation of the coding elements (3) in their operating cycle, which then emit a frequency-rich signal made up of a wave having the fundamental frequency and waves having a frequency that is a multiple of the fundamental frequency, called harmonics, to gather and process the signal coming from these elements (3) and to reconstruct the coding of the object (1).

L'invention concerne un système de détection, adapté à l'identification et au suivi de canalisations enterrées ou d'autres corps enfouis dans le sol ou noyés dans des ouvrages de génie civil, comprenant : un dispositif de codage, apposé ou intégré aux objets (1 ), se présentant sous la forme d'une succession d'éléments de codage (3) de faible épaisseur, formant chacun une surface de dimension prédéterminée, ces éléments étant séparés les uns des autres, et leur agencement permettant de définir un code, un dispositif de détection comportant au moins une bobine d'émission (5), au moins une bobine de réception (6), et un dispositif de traitement des signaux issus des différentes bobines (5, 6), caractérisé en ce qu'au moins certains des éléments de codage (3) sont réalisés en matériau magnétique, le dispositif de détection étant agencé pour saturer ou modifier le point de fonctionnement des éléments de codage (3) dans leur cycle de fonctionnement, qui émettent alors un signal riche en fréquences, composé d'une onde de fréquence fondamentale ainsi que d'ondes de fréquence multiple de la valeur de la fréquence fondamentale, appelées harmoniques, recueillir et traiter le signal issu de ces éléments (3), et reconstituer le codage de l'objet (1 ).

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