Communications – electrical: acoustic wave systems and devices – Testing – monitoring – or calibrating
Patent
1989-12-21
1991-03-19
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Testing, monitoring, or calibrating
73640, 73642, 310336, H04B 1700, G01N 2900, G01N 2904, G01N 2924
Patent
active
050016741
ABSTRACT:
An ultrasonic testing method comprises steps of transmitting an ultrasonic wave from a probe to a test article, detecting an internal flaw in the test article by a reflected flaw echo from the internal flaw, and deciding a condition of the detected flaw by comparing and analyzing frequency components of the transmitted ultrasonic wave and the reflected flaw echo. The probe has a curved tip surface which is the same kind as that of a curved incident surface of the test article and has a radius of curvature of 0.5.about.2.0 times the radius of curvature of the curved incident surface of the test article.
REFERENCES:
patent: 4041774 (1977-08-01), Morris et al.
patent: 4472975 (1984-09-01), Beck et al.
patent: 4566333 (1986-01-01), Chubachi et al.
Japanese Journal of Applied Physics, vol. 24, Suppl. No. 24, part 1, 1985, pp. 100-102, A. Jitsumori et al; "Detection of Near-Surface Flaws Using Linear FM Ultrasonic Wave".
Lobo Ian J.
NGK Insulators Ltd.
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