Electromagnetic acoustic transducer

H - Electricity – 04 – R

Patent

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Details

H04R 9/04 (2006.01) B06B 1/04 (2006.01) G01N 29/24 (2006.01)

Patent

CA 2193383

An electromagnetic acoustic transducer (EMAT) (100) for transmitting and receiving signals within an electrically conductive structure (170), a method of fabricating the EMAT (100), and a method of generating and detecting acoustic waves in the conductive structure (170) are provided. The EMAT (100) includes a magnetic source for establishing a static magnetic field and a multilayered printed circuit board (PCB) (105, 110, 115, 120, 125, 135) positioned within the magnetic field. The multilayered PCB includes a plurality of coil layers (105, 115), an interconnect layer (125), and a ground plane (135). The number of coil layers (105, 115) employed in the EMAT and the liftoff distance (160) (the distance between the interconnect layer the furthest from the surface (165) of the electrically conductive structure (170) and the surface (165) of the electrically conductive structure (170)) are optimized so as to increase the amplitude of the received signal and to increase the conversion efficiency of the EMAT.

L'invention concerne un transducteur acoustique électromagnétique (100) conçu pour émettre et recevoir des signaux dans une structure électroconductrice (170), un procédé de fabrication dudit transducteur (100) et un procédé de production et de détection d'ondes acoustiques dans la structure conductrice (170). Ledit transducteur (100) comporte une source magnétique permettant de produire un champ magnétique statique dans lequel une carte à circuits imprimés multicouche (105, 110, 115, 120, 125, 135) est prévue. La carte multicouche comporte une pluralité de couches bobine (105, 115), une couche d'interconnexion (125), et un plan de masse (135). Le nombre de couches bobine (105, 115) utilisées dans ledit transducteur et la distance d'arrachement (160) (distance entre la couche d'interconnexion la plus loin de la surface (165) de la structure électroconductrice (170) et la surface (165) de cette dernière (170)) est optimisé, de sorte que l'amplitude du signal reçu soit augmentée ainsi que l'efficacité de conversion dudit transducteur.

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