Ultrasonic wheel probe with acoustic barrier

Details Ultrasonic wheel probe with acoustic barrier Ultrasonic wheel probe with acoustic barrier

G - Physics

01

N

349/42

G01N 29/04 (2006.01) G01N 29/24 (2006.01)

Patent

CA 1241106

ABSTRACT OF THE DISCLOSURE An ultrasonic wheel probe of the type having a wheel- shaped container with an annular outer surface for rotating about an axis of rotation and rolling upon a specimen to be tested is provided with a plurality of transducers for transmitting and receiving ultrasonic acoustic energy, respectively. In accordance with the invention, an acoustic barrier is interposed between the transmitting and receiving transducers, and immersed in the coup- ling fluid, so as to isolate the transmitting and receiving trans- ducers from one another. With this arrangement, echoes emanating from the interface, or surface, of the specimen being tested are prevented from reaching the receiving transducer. The acoustic barrier is preferably installed on a yoke of the wheel probe so as to be displaceable in a substantially radial direction in response to the contour of the specimen being tested. The radial align- ment of the acoustic barrier is maintained by a pair of shafts which extend through the yoke and have linear bearings interposed therein. A resilient element, such as a spring, is arranged to urge the acoustic barrier to its maximum extent from the axis of rotation. An additional transducer is arranged to communicate ultrasonically with the acoustic barrier so as to monitor its radial location at all times. The signals produced by this mon- itoring transducer can be utilized to control feedback and gate triggering circuitry.

482885

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