Apparatus and method for ultrasonic inspection

Details Apparatus and method for ultrasonic inspection Apparatus and method for ultrasonic inspection

1980-10-23

1983-09-13

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

044035101

ABSTRACT:
In a new method and apparatus for ultrasonic inspection of objects each inspection device of the apparatus is fed by gravity with a supply of a liquid coupling medium, from which the device produces a flowing liquid column that is directed at the object. The device mounts a focusing ultrasonic transducer that generates an ultrasonic beam in the liquid focused at a downstream point not less than about 5 cm from the oscillation generating surface. The external envelope of the ultrasonic beam is contained wholly within the external envelope of the liquid stream with a separation between them at least until the object is impinged by the liquid column. The liquid feed is made as non-turbulent and entrained bubble-free as possible to avoid the generation of unwanted background noise and spurious signals. The increase in distance through which inspection can be effected simplifies the application of the method to testing pipe wall and laminar thickness and to the testing of bulky bodies such as aeroplane wings. It also permits the application of the method and apparatus to the in situ testing of the wall thickness of well pipes.

REFERENCES:
patent: 3255626 (1966-06-01), Van Der Veer
patent: 3323354 (1967-06-01), Daubresse
patent: 3420097 (1969-01-01), Battermann et al.
patent: 3832889 (1974-09-01), Bauer
patent: 3908445 (1975-09-01), Verdon et al.

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