Measuring and testing – Vibration – By mechanical waves
Patent
1988-03-15
1991-06-04
Wallace, Linda J.
Measuring and testing
Vibration
By mechanical waves
73602, 73627, G01N 924
Patent
active
H00009245
ABSTRACT:
A system and method for detecting defects in composite laminate material are described which comprise a first trtansducer for directing an ultrasonic beam of preselected frequency and tone burst excitation along a transmission axis through a sonic coupling bath onto a surface of the material at a preselected angle to generate Lamb waves in the material and leaky Lamb waves reflected therefrom, a frequency modulator for selectively modulating the frequency of the incident beam, and a second transducer for receiving the reflected sonic field including leaky Lamb waves reflected from the material and for providing a recovered and envelope-detected output signal corresponding to the amplitude of the reflected waves.
REFERENCES:
patent: 2995925 (1961-08-01), Worlton
patent: 3120120 (1964-02-01), Worlton et al.
patent: 3165922 (1965-01-01), Worlton
patent: 3250120 (1966-05-01), Dickinson, III
patent: 3512400 (1970-05-01), Lynnworth
patent: 3572099 (1971-03-01), Wieczorek
patent: 3813926 (1974-06-01), Stubbeman
patent: 4100808 (1978-07-01), Evans et al.
patent: 4111053 (1978-09-01), Geithman et al.
patent: 4182155 (1980-01-01), Fowler
patent: 4305294 (1981-12-01), Vasile et al.
patent: 4325255 (1982-04-01), Howard et al.
patent: 4336719 (1982-06-01), Lynnworth
patent: 4457174 (1984-07-01), Bar-Cohen et al.
patent: 4494408 (1985-01-01), DeLacy
patent: 4512194 (1985-04-01), Beuter
patent: 4523468 (1985-06-01), Derkacs et al.
patent: 4538462 (1985-09-01), Hartog et al.
patent: 4577503 (1986-03-01), Imaino et al.
patent: 4640132 (1987-02-01), Flora et al.
patent: 4674334 (1987-06-01), Chimenti et al.
D. E. Chimenti et al, "Signal Analysis of Leaky Lamb Wave Spectra for NDE of Composites", in Proceedings of 1985 Ultrasonics Symposium (Apr. 18, 1986).
D. E. Chimenti et al, "Leaky Lamb Waves in Fibrous Composite Materials", in J. Appl. Phys. 58:12, 4531-38 (Dec. 1985).
D. E. Chimenti et al, "Anomalous Ultrasonic Dispersion in Fluid-Coupled, Fibrous Composite Plates", Appl. Phys. Lett. 49:9, 492-93 (Sep. 1986).
Scearce Bobby D.
Singer Donald J.
The United States of America as represented by the Secretary of
Wallace Linda J.
LandOfFree
Signal analysis in leaky Lamb wave NDE technique does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Signal analysis in leaky Lamb wave NDE technique, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal analysis in leaky Lamb wave NDE technique will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1016983