ULTRASONIC FLAW DETECTION METHOD AND MEANS

Patent · Tue Aug 15 04:00:00 EDT 1961

OSTI ID:4021306

Worlton, D C

A method of detecting subsurface flaws in an object using ultrasonic waves is described. An ultnasonic wave of predetermined velocity and frequency is transmitted to engage the surface of the object at a predetermined angle of inci dence thereto. The incident angle of the wave to the surface is determined with respect to phase velocity, incident wave velocity, incident wave frequency, and the estimated depth of the flaw so that Lamb waves of a particular type and mode are induced only in the portion of the object between the flaw and the surface. These Lamb waves are then detected as they leave the object at an angle of exit equal to the angle of incidence. No waves wlll be generated in the object and hence received if no flaw exists beneath the surface. (AEC)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-025030
• Assignee: U.S. Atomic Energy Commission
• Patent Number(s): US 2995925
• OSTI ID: 4021306
• Country of Publication: United States
• Language: English

Related Subjects

DEFECTS
DETECTION
ENGINEERING AND EQUIPMENT
FREQUENCY
LAMB WAVES
LENSES
MATERIALS TESTING
PERFORMANCE
PLATES
SPECTRAL SHIFT
SURFACES
ULTRASONICS
VELOCITY
VIBRATIONS