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Ultrasonic Phased Array Implementation of the Inside Diameter Creeping Wave Sizing Method.

DE2008911768

Publication Date	2006
Personal Author	McJunkin, T. R.; Davis, J. M.; Kunerth, D. C.; Watkins, A. D.
Page Count	8
Abstract	This paper describes a technique for implementing the ultrasonic inside diameter (ID) creeping wave technique for detection and sizing ID connected defects using a phased array ultrasonic system. The technique uses multiple focal laws to produce the examination modes. The first focal law is designed to create a shear wave nominally at the critical angle for mode conversion to a longitudinal wave at the ID of a part, thus creating a creeping wave. This focal law is focused at the ID to improve sensitivity. The rest of the laws are designed to create tandem sound paths that progress up a vertical surface directly above the focal point of the creeping wave generation point. When a defect on the inner surface is detected with the creeping wave, the height of the defect can be measured from the response of a set of tandem laws without readjusting the position of the probe. Results from standard one-inch long notches of varying depths are presented.
Keywords	Ultrasonic radiation Creep properties Detection Defects Implementation Mode conversion Sensitivity Shear Size
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Enviro Control, Inc., Fort Collins, CO.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200821
Contract Number	DE-AC07-99ID-13727

Ultrasonic Phased Array Implementation of the Inside Diameter Creeping Wave Sizing Method.

Ultrasonic Phased Array Implementation of the Inside Diameter Creeping Wave Sizing Method.
DE2008911768

Publication Date	2006
Personal Author	McJunkin, T. R.; Davis, J. M.; Kunerth, D. C.; Watkins, A. D.
Page Count	8
Abstract	This paper describes a technique for implementing the ultrasonic inside diameter (ID) creeping wave technique for detection and sizing ID connected defects using a phased array ultrasonic system. The technique uses multiple focal laws to produce the examination modes. The first focal law is designed to create a shear wave nominally at the critical angle for mode conversion to a longitudinal wave at the ID of a part, thus creating a creeping wave. This focal law is focused at the ID to improve sensitivity. The rest of the laws are designed to create tandem sound paths that progress up a vertical surface directly above the focal point of the creeping wave generation point. When a defect on the inner surface is detected with the creeping wave, the height of the defect can be measured from the response of a set of tandem laws without readjusting the position of the probe. Results from standard one-inch long notches of varying depths are presented.
Keywords	Ultrasonic radiation Creep properties Detection Defects Implementation Mode conversion Sensitivity Shear Size
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Enviro Control, Inc., Fort Collins, CO.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200821
Contract Number	DE-AC07-99ID-13727