Measuring and testing – Vibration – By mechanical waves
Patent
1981-02-03
1983-02-08
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73597, 73599, G01N 2900
Patent
active
043721630
ABSTRACT:
Disclosed is a method for determining the dispersion of a surface acoustic wave in an object, including the steps of generating a broadband acoustic wave in a surface of the object, detecting the wave at first location on the surface, and detecting the wave at a second location on the surface. Fourier transforms of the first and second detected waves are calculated, then the change in phase .DELTA..phi.(f) of the frequency component f of the detected wave, between the first and second locations, is computed from the phase components of the quotient of the two transforms. The dispersion of the wave in the surface is given by the formula
REFERENCES:
patent: 2439130 (1948-04-01), Firestone
patent: 3309914 (1967-03-01), Weighart
patent: 3504532 (1970-04-01), Muenow et al.
patent: 3512400 (1970-05-01), Lynnworth
patent: 3588800 (1971-06-01), Moore
patent: 3720098 (1973-03-01), Dixon
patent: 3847016 (1974-11-01), Ziedonis
patent: 3924454 (1975-12-01), McElroy et al.
patent: 3958450 (1976-05-01), Kleesattel
patent: 4137779 (1979-02-01), Wustenberg et al.
patent: 4313070 (1982-01-01), Fisher
Bucaro, et al., Rayleigh Wave Dispersion on Surface-Treated Glass, 43 J. Appl. Phys. 2151 (1972).
Richardson, et al., Deducing Subsurface Property Gradients from Surface Wave Dispersion Data, 1975 IEEE Ultrasonics Symposium Proceedings 488.
Richardson, et al., Estimation of Surface Layer Structure from Rayleigh Wave Dispersion, 48 J. Appl. Phys. 498 (1977).
Richardson, et al., Estimation of Surface Layer Structure from Rayleigh Wave Dispersin, 48 J. Appl. Phys. 5111 (1977).
Richardson, et al., Estimation of Surface Layer Structure from Rayleigh Wave Dispersion, 49 J. Appl. Phys. 5242 (1978).
Szabo, Obtaining Subsurface Profiles from Surface-Acoustic-Wave Velocity Dispersion, 46 J. Appl. Phys. 1448 (1975).
Tittmann, A Technique for Precision Measurements of Elastic Surface Wave Properties on Abritrary Materials, 42 Rev. Sci. Inst. 1136 (1971).
Tittmann, et al., Use of the Impulse Technique for Rapid Texture Evaluation _in Commercial Tube and Plate Materials, 74 Met. Trans. 229 (1976).
Tittmann, et al., Characterization of Subsurface Anomalies by Elastic _Surface Wave Dispersion, 1974 IEEE Ultrasonics Symposium Proceedings 561.
Ahlberg Lloyd A.
Elsley Richard K.
Tittmann Bernhard R.
Birmiel Howard A.
Deinken John J.
Hamann H. Fredrick
Malin Craig O.
Rockwell International Corporation
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