Ultrasonic method and apparatus for determining the depth of a c

Details Ultrasonic method and apparatus for determining the depth of a c Ultrasonic method and apparatus for determining the depth of a c

1983-12-12

1985-06-11

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73600, 73628, 73640, G01N 2904

Patent

active

045220646

ABSTRACT:
An ultrasonic method and apparatus are described for determining the depth of cracks 12 in a pipe or conduit 14. The apparatus 10 includes a transmitting transducer 30 and a receiving transducer 40 that are placed on the outside surface of the pipe to one side of the pipe. The transmit transducer 30 is energized to direct a shear wave beam 34 of ultrasonic energy at the crack to generate a complex reflected wave front from the crack 12 which contains information as to the size of the crack in relation to the wall thickness. The recovery transducer 40 is moved relative to the transmit transducer until a peak or maximum amplitude reading is found. When the maximum amplitude is found, the distance between the transducers is measured. The measured distance is then correlated with information obtained from specimens 80 of the same material and wall thickness as the on-site pipe to determine the depth of the crack 12.

REFERENCES:
patent: 2660054 (1953-11-01), Pringle, Jr.
patent: 2799157 (1957-07-01), Pohlman
patent: 2937522 (1960-05-01), McGaughey
patent: 3585851 (1971-06-01), Walther
patent: 3683680 (1972-08-01), Johnson et al.
patent: 4270389 (1981-06-01), Shiraiwa et al.
patent: 4393711 (1983-07-01), Lapides
patent: 4435984 (1984-03-01), Gruber
"Height Determination Studies for Planar Defects by Means of Ultrasonic Testing"-The Non Destructive Testing Journal, Japan vol. 1, No. 1, 1983.

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