Hydrogen damage confirmation with emats

G - Physics – 01 – N

Patent

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G01N 29/04 (2006.01) G01N 29/16 (1990.01)

Patent

CA 2097583

A method and apparatus for use in confirming hydrogen damage in a boiler tube comprises a pair of electromagnetic acoustic transducer coils which are mounted for movement toward and away from each other. An electromagnet produces pulses that generate acoustic beams across a chord and within the wall thickness of the boiler tube. For adapting to boiler tubes of different outside diameters, the transducers coils are mounted on a resilient member so that the coils can be pressed against the outer surface of coils having a variety of outside diameters. The angle of the acoustic beam between the coils must also be adjusted, however, and this is done by changing the frequency of energy applied to the coils.

Méthode et appareil pour confirmer les dommages causés par l'hydrogène dans un tube de chaudière. Comprend une paire de bobines de transducteur acoustique électromagnétique qui sont montées de façon à pouvoir se rapprocher et s'éloigner l'une de l'autre. Un électro-aimant produit des impulsions qui génèrent des faisceaux acoustiques suivant une corde et à travers la paroi du tube de chaudière. Pour l'adaptation à des tubes de différents diamètres extérieurs, les bobines des transducteurs sont montées sur un élément élastique de façon à pouvoir s'appuyer sur la surface extérieure de tubes ayant divers diamètres extérieurs. Toutefois, l'angle du faisceau acoustique séparant les bobines doit également être réglé, ce qui se fait en changeant la fréquence de l'énergie appliquée aux bobines.

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