Measuring and testing – Vibration – By mechanical waves
Patent
1984-06-19
1986-03-18
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73623, 73628, 73629, 310335, G01N 2900
Patent
active
045760489
ABSTRACT:
The disclosure is directed to a method and apparatus for non-destructive inspection of a solid workpiece, such as a steel workpiece. In accordance with the method of the invention, ultrasound is generated at an annular ring or portion thereof and focused into a hollow substantially cone-shaped beam, or sector thereof. The beam is directed at the surface of the workpiece so as to establish shear mode ultrasound energy in the workpiece. Ultrasound energy is then received from the workpiece (e.g. by reflection or transmission) and characteristics of the internal structure of the workpiece can be determined from the received ultrasound energy. In the preferred embodiment of the invention, the beam is configured such that the ultrasound energy impinging on the surface of the workpiece is at a sufficiently large angle with respect to the normal to the surface such that primarily shear mode of ultrasonic energy will be established within the workpiece. In a form of the invention, a second beam of ultrasound energy is generated and focused within the annular ring, this second beam being used to inspect the workpiece with a compressional mode of ultrasonic energy. In a form of the invention, an ultrasound-reflective surface is disposed in the path of the beam to correct for the inherent focusing effect of the curved surface contour of a workpiece to be inspected.
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patent: 4321696 (1982-03-01), Kanda
patent: 4409839 (1983-10-01), Taenzer
patent: 4481822 (1984-11-01), Kubota et al.
Kreitman Stephen A.
New York Institute of Technology
Novack Martin
LandOfFree
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