Measuring and testing – Vibration – By mechanical waves
Patent
1989-07-14
1991-02-26
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
G01N 2900
Patent
active
049952609
ABSTRACT:
A method and apparatus for nondestructive material characterization, such as identification of material flaws or defects, material thickness or uniformity and material properties such as acoustic velocity. The apparatus comprises a pulsed laser used to excite a piezoelectric (PZ) transducer, which sends acoustic waves through an acoustic coupling medium to the test material. The acoustic wave is absorbed and thereafter reflected by the test material, whereupon it impinges on the PZ transducer. The PZ transducer converts the acoustic wave to electrical impulses, which are conveyed to a monitor.
REFERENCES:
patent: 4567769 (1986-02-01), Barkhoudarian
"Generation of Elastic Waves by Transient Surface Heating", by R. M. White, Journal of Applied Physics, vol. 34, No. 12, Dec. 1963.
"Laser Excitation of Microwave Sound in Solids", by G. Cachier The Journal of the Acoust. Soc. of America vol. 49, No. 3.
Deason Vance A.
Johnson John A.
Telschow Kenneth L.
Albrecht John M.
Arana Louis M.
Moser William R.
Smith Bradley W.
The United States of America as represented by the United States
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