Method and apparatus for ultrasonic flaw detection

Details Method and apparatus for ultrasonic flaw detection Method and apparatus for ultrasonic flaw detection

G - Physics

01

N

G01N 29/06 (2006.01)

Patent

CA 2330662

A method and apparatus for ultrasonic flaw detection of line focus type suitable for detection of flaws in nonmetallic materials included in an object. Ultrasonic transmitter and receiver elements of line focus type are opposed at a distance (L) with an object under test placed between them, and a maximum ultrasonic echo is obtained at a distance Lp expressed by: Lp=0.75(FT+FR)-{(CS/CW)-1}t where FT (mm) is the focal length in the medium of the ultrasonic transmitter element of line focus type, FR (mm) is the focal length in the medium of the ultrasonic receiver element of line focus type, CS (m/sec) is the speed of ultrasound in an object under test, CW (m/sec) is the speed of ultrasound in the medium, and t (mm) is the thickness of the object under test.

L'invention concerne un procédé et un appareil de détection de failles par ultrasons du type à focalisation linéaire conçu pour détecter des failles dans des matières non métalliques constituant un objet. Des éléments émetteur et récepteur des ultrasons du type à focalisation linéaire sont séparés par une distance (L) d'un objet testé placé entre lesdits éléments. On obtient un écho ultrasonique maximal à une distance Lp exprimée par: Lp = 0,75 (FT+FR) - {(CS/CW)-1}t où FT (mm) est la distance focale dans le milieu de l'émetteur des ultrasons du type à focalisation linéaire, FR (mm) est la distance focale dans le milieu du récepteur des ultrasons du type à focalisation linéaire, CS (m/s) est la vitesse des ultrasons dans un objet testé, CW (m/s) est la vitesse des ultrasons dans le milieu et t(mm) est l'épaisseur de l'objet testé.

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