Measuring and testing – Vibration – By mechanical waves
Patent
1979-04-23
1981-05-05
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73644, 73655, 350 9613, G01N 2904, G02B 514
Patent
active
042651220
ABSTRACT:
Disclosed is an apparatus and method for nondestructive testing of structures where the apparatus includes a transducer for generating an ultrasonic acoustic signal, a nonlinear medium for parametrically generating a special, ramp, waveform, and an acousto-optic broadband receiver for detecting a reflected signal from the test structure. A homodyne interferometer is provided to measure the change of refractive index of the acousto-optic receiver, and generates an electrical signal representative of the reflected acoustic signal. Signature analysis techniques are utilized to evaluate the reflected waveform to determine the characteristics of the structural defects.
REFERENCES:
patent: 3297875 (1967-01-01), Garwin et al.
patent: 3771856 (1973-11-01), Eschler
patent: 3856378 (1974-12-01), Brandt et al.
patent: 3903496 (1975-09-01), Stimler
patent: 3903497 (1975-09-01), Stimler et al.
patent: 3916182 (1975-10-01), Dabby et al.
patent: 3931595 (1976-01-01), Isaacs et al.
patent: 4019373 (1977-04-01), Freeman et al.
patent: 4068191 (1978-01-01), Zemon et al.
patent: 4070091 (1978-01-01), Taylor et al.
patent: 4162397 (1979-07-01), Bucaro et al.
M. B. Moffett et al.; "Model for Parametric Acoustic Sources," J. Acoust. Soc. Am., vol. 61, No. 2, pp. 325-337, Feb. 1977.
J. H. Cole et al.; "Fiber-Optic Detection of Sound," J. Acoust. Soc. Am., vol. 62, No. 5, pp. 1136-1138, Nov. 1977
J. A. Bucaro et al.; "Fiber-Optic Hydrophone," J. Acoust. Soc. Am., vol. 62, No. 5, pp. 1302-1304, Nov. 1977.
J. H. Hunter et al.; "Acoustic Backscattering From Thin Air-Filled Spherical Shells in Water," J. Acoust. Soc. Am., vol. 62, No. 5, pp. 1139-1143, Nov. 1977.
J. D. Young, "Radar Imaging From Ramp Response Signatures," IEEE Transactions on Attennas and Propogation, vol. AP-24, pp. 276-282, 1977.
R. D. Strattan, "Target Identification From Radar Signatures," IEEE International Conference on Acoustics, Speech, and Signal Processing, pp. 223-227, Apr. 1978.
Cavanagh Eduardo
Cook Billy D.
Kreitman Stephen A.
University of Houston
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