Ultrasonic inspection method and apparatus

Details Ultrasonic inspection method and apparatus Ultrasonic inspection method and apparatus

G - Physics

01

N

G01N 29/04 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2249752

Radially spaced calibration holes are drilled parallel to the exterior surface of a cylindrical shell for a dryer roll. An ultrasonic transducer is mounted in a fixture filled with a coupling medium which allows for adjustment of the spacing and angle of the transducer which traverses the shell as it is rotated. A computer calculates the time the signal takes to travel from and return to the transducer and the depth from which the signal returns. A clear signal corresponding to holes up to one inch from the surface are found by adjusting the ultrasonic transmission angle. This angle is approximately 23 degrees from a normal to the casting surface. The calibrated transducer traverses the surface of the casting. The stored data may be used in maintaining the dryer roll formed from the casting.

Des trous d'étalonnage espacés radialement sont percés parallèlement sur la surface extérieure du corps cylindrique d'un rouleau de séchoir. Un transducteur ultrasonique est monté dans un réservoir rempli d'un liquide de couplage qui permet le réglage de l'espacement et de l'angle du transducteur dont le signal traverse le corps cylindrique pendant la rotation. Un ordinateur calcule le temps que prend le signal pour provenir du transducteur et y retourner, et la profondeur à partir de laquelle le signal revient. Un signal net correspondant à des trous jusqu'à un pouce de la surface est obtenu au moyen du réglage de l'angle d'émission ultrasonique. Cet angle est d'environ 23 degrés, d'une position normale à la surface du cylindre. Le signal du transducteur étalonné traverse la surface du cylindre. Les données stockées peuvent être utilisées pour entretenir le rouleau de séchoir formé à même le cylindre.

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