Method for determining a position of an object

E - Fixed Constructions – 21 – B

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E21B 47/09 (2006.01) E21B 47/01 (2006.01) G01V 1/40 (2006.01) G01V 1/44 (2006.01)

Patent

CA 2516940

A method for determining a mutual distance between two objects in a pipeline. The method comprises the steps of: providing a pipeline which is filled with a medium having an acoustic impedance different from that of the material of the pipeline and/or a medium present outside the pipeline; providing each of the two objects with a clock; synchronizing the clocks; periodically transmitting an acoustic signal from a first to a second one of the two objects; measuring the reception time of the acoustic signal; determining the delay time from the first to the second object; and calculating a traveled distance of the signal between the two objects on the basis of a propagation speed of the acoustic signal in the medium and the measured delay time of the acoustic signal.

L'invention concerne un procédé de détermination d'une distance mutuelle entre deux objets dans un pipeline. Ledit procédé consiste à fournir un pipeline qui est rempli avec un milieu possédant une impédance acoustique différente de celle de la matière du pipeline et/ou d'un milieu présent à l'extérieur du pipeline, fournir une horloge à chacun des deux objets, synchroniser les horloges, transmettre périodiquement un signal acoustique d'un premier objet au second objet, mesurer le temps de réception du signal acoustique, déterminer le délai du premier au second objet, et calculer une distance parcourue du signal entre les deux objets en fonction d'une vitesse de propagation du signal acoustique dans le milieu et du délai mesuré du signal acoustique.

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