Electromagnetic acoustic transducer for bolt tension and...

G - Physics – 01 – L

Patent

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Details

G01L 5/24 (2006.01) G01L 1/25 (2006.01) G01N 29/04 (2006.01) G01N 29/24 (2006.01) F16B 31/02 (2006.01)

Patent

CA 2183338

A device for measuring a load on a part such as a bolt (2), comprises a socket (15) have walls defining an interior space (17) wherein the socket engages the bolt for transmitting a load to the bolt. An electromagnetic acoustic transducer (20) comprising a magnet (28) and a coil (26) is located in the interior space of the socket near the bolt. The coil provides a current while the magnetprovides a magnetic field such that the magnet and the coil generate an ultrasonic signal with the bolt. A detector is used to detect and measure a change in the ultrasonic signal at the bolt.

Dispositif pour mesurer une charge sur une pièce telle qu'un boulon (2). Ce dispositif comprend une douille (15) dont les parois définissent un espace intérieur (17) dans lequel la douille se met en prise avec le boulon pour transmettre une charge à ce dernier. Un transducteur acoustique électromagnétique (20) comprenant un aimant (28) et une bobine (26) est placé dans l'espace intérieur de la douille près du boulon. La bobine fournit un courant tandis que l'aimant génère un champ magnétique, de telle sorte que l'aimant et la bobine génèrent un signal ultrasonore avec le boulon. Un détecteur permet de détecter et de mesurer un changement dans le signal ultrasonore au niveau du boulon.

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