Measuring and testing – Vibration – By mechanical waves
Patent
1977-08-01
1979-11-20
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73639, G01N 2904
Patent
active
041746368
ABSTRACT:
A system and method for performing ultrasonic inspection of a length of test material with ultrasonic transducing means emitting a beam of ultrasonic energy from within sealed wheel means containing a coupling fluid therein and having a flexible cylindrical surface member transparent to the ultrasonic beam and arranged for rolling contact along the test material. The system and method are characterized by spaced leading and trailing wheel means arranged for rolling contact along the length of test material. Ultrasonic transducer means in each of the leading and trailing wheel means are oriented so that a beam of ultrasonic energy emitted from the transducer means in one wheel means will enter the test material, be reflected from the bottom surface thereof, and be directed to and received by the transducer mean in the other wheel means. Each wheel means further includes ultrasonic transducers emitting ultrasonic energy longitudinally in front of and behind the two wheels, and side-looking transducer means for emitting ultrasonic energy into the test material transversely to the direction of travel. Additional transducers emit radiation perpendicularly through the test material. Accordingly, the test material is fully probed and many different kinds of defects can be detected. The transducers are positioned away from the test material by a distance which is substantially the near field distance of the ultrasonic beam. Means are provided for adjusting the spacing between two wheels, to allow different thicknesses of test material to be tested by interwheel transmission of the ultrasonic beam.
REFERENCES:
patent: 3028751 (1962-04-01), Joy
patent: 3251220 (1966-05-01), Joy
patent: 3257843 (1966-06-01), Cowan
patent: 3415110 (1968-12-01), Cowan
patent: 3628375 (1971-12-01), Pagano
patent: 3768306 (1973-10-01), Stearns
patent: 3937068 (1976-02-01), Joy
Pagano et al., Detectability Evaluation of AAR-Magnetic and Dapco-Ultrasonic Rail Inspection Systems, Jul. 1976.
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