초록 ▼

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

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 coupling fluid, so as to isolate the transmitting and receiving transducers 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. By eliminating the interface echo the only echoes received are from the back wall of the specimen under test or from anomalies within the specimen, thereby permitting testing from the front surface to the back wall of the specimen. 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 alignment 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 monitoring transducer can be utilized to control feedback and gate triggering circuitry.

대표청구항 ▼

An ultrasonic inspection apparatus of the type having a container having a substantially annular outer surface for rotating about an axis of rotation and rolling on a specimen to be tested, the container having a yoke arranged at least partly on the axis of rotation and being filled with a coupling

An ultrasonic inspection apparatus of the type having a container having a substantially annular outer surface for rotating about an axis of rotation and rolling on a specimen to be tested, the container having a yoke arranged at least partly on the axis of rotation and being filled with a coupling fluid for propagating ultrasonic acoustic energy, the ultrasonic inspection apparatus comprising: first and second transducer means for transmitting ultrasonic acoustic energy through the coupling fluid, the substantially annular outer surface of the container, and into the specimen to be tested, and for receiving echoes of said transmitted ultrasonic acoustic energy, respectively; and acoustic barrier means interposed between said first and second transducer means and immersed in the coupling fluid for acoustically isolating said first transducer means from said second transducer means, wherein there is further provided mounting means for securing said acoustic barrier means to the yoke, said acoustic barrier means extending substantially to an annular inner surface of the container, said annular inner surface being in communication with the coupling fluid.