Measuring and testing – Vibration – By mechanical waves
Patent
1993-07-16
1995-02-21
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
G01N 924
Patent
active
053905440
ABSTRACT:
A method and related apparatus for non-destructive evaluation of composite materials by determination of the quantity known as Integrated Polar Backscatter, which avoids errors caused by surface texture left by cloth impressions by identifying frequency ranges associated with peaks in a power spectrum for the backscattered signal, and removing such frequency ranges from the calculation of Integrated Polar Backscatter for all scan sites on the composite material.
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Characterization of Porosity in Continuous Fiber-Reinforced Composites With Ultrasonic Backscattering, Ronald A. Roberts, Materials and components Technology Division, Argonne National Laboratory, Argonne, Ill. 60439, Review of Progress in Quantitative Nondestructive Evaluation, vol. 78, pp. 1153-1162 (1988).
Quantitative Non-Destructive Evaluation of Composite Materials Based on Ultrasonic Wave Propagation, Semi-annual Progress Report, Sep. 15, 1986-Mar. 15, 1987, Dr. James G. Miller, Principal Investigator, Professor of Physics, Washington University, Department of Physics, Laboratory for Ultrasonics, St. Louis, Mo. 63130.
Measured Effects of Surface Cloth Impressions on Polar Backscatter and Comparison with a Reflection Grating Model, E. I. Madaras, NASA, Langley Research Center, Hampton, Va. 23665; Edwin F. Brush, III, Dept. of Physics, Colorado College, Colorado Springs, Colo. 80903; S. Lori Bridal, Mark R. Holland, J. G. Miller, Laboratory for Ultrasonics, Dept. of Physics, Washington University, St. Louis, Mo. 63130; 19th Annual Review of Progress in Quantitative Nondestructive Evaluation, La Jolla, Calif., Jul. 20-24, 1992.
Quantitative Non-Destructive Evaluation of Composite Materials Based on Ultrasonic Wave Propagation, Semi-annual Progress Report, Mar. 15, 1985-Sep. 15, 1985, Dr. James G. Miller, Principal Investigator, Professor of Physics, Washington University, Department of Physics, Laboratory for Ultrasonics, St. Louis, Mo. 63130.
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Effects of Bleeder Cloth Impressions on the Use of Polar Backscatter to Detect Porosity, 1988 Review of Progress in Quantitative Nondestructive Evaluation, LaJolla, Calif., Jul. 31-Aug. 1988, S. M. Handley, J. G. Miller, Dept. of Physics, Washington University, St. Louis, Mo. 63130; Eric Madaras, NASA Langley Research Center, M/S 231, Hampton, Va. 23665, 1988.
Porosity Characterization in Fiber-Reinforced Composites By Use of Ultrasonic Backscatter, Review in Progress in Quantitative NDE v. GB, pp. 1147-1156, (1987), Ronald A. Roberts, Materials and Components Technology Division, Argonne National Laboratory, Argonne, Ill. 60439.
An Investigation of the Relationship Between Contrast and Azimuthal Angle for Imaging Porosity in Graphite/Epoxy Composites with Ultrasonic Polar Backscatter, 1988 IEEE Ultrasonic Symposium, Chicago, Ill., Oct. 2-5, 1988, S. M. Handley, J. G. Miller, Dept. of Physics, Washington University, St. Louis, Mo. 63130; Eric Madaras, NASA Langley Research Center, M/S 231, Hampton, Va. 23665, 1988.
Blackburn Linda B. B.
Oda Christine K.
The United States of America as represented by the Administrator
Williams Hezron E.
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