Measuring and testing – Vibration – By mechanical waves
Patent
1979-02-08
1981-01-27
Gill, James J.
Measuring and testing
Vibration
By mechanical waves
73643, G01N 2904
Patent
active
042467934
ABSTRACT:
Methods (and apparatus) for nondestructively testing a body of material having a surface in contact with a gaseous environment (e.g. air, nitrogen, or inert gas), that comprise (A) the step of (and means for) directing to a region at the surface of the body a pulse of laser radiation having sufficient energy density and sufficiently long wavelength to initiate in the adjacent gas a blast wave that impinges on the surface and provides an ultrasonic wave in the body, and (B) the further step of (and means for) detecting a portion of the ultrasonic wave that has been affected by the body. The radiation directing means typically comprises a laser that provides a pulse having a duration of about 0.01 to 10 microseconds, and means for focusing the pulse to provide an energy density of at least about 5 Joules per square centimeter. The detecting means typically comprises an electromagnetic or capacitive transducer.
REFERENCES:
patent: 3978713 (1976-09-01), Penney
"Ultrasonic Testing of Materials" 2d Ed. by Krautkramer, Springer-Verlag, NY, NY, Translation of German 1975, pp. 150-162.
"Conversion of Electromagnetic to Acoustic Energy by Surface Heating" by Gournay, from The Journal of the Acoustical Society, 1966, pp. 1322-1330.
"Laser Generated Ultrasonic Beams" by Felix from Rev. of Scientific Instr. pp. 1106-1108 (1974).
"Optical Excitation of Sound Waves", Bunkin et al., Soviet Phys. Acoust. 19 (3) pp.203-211 (1973).
Fairand Barry P.
Golis Matthew J.
Battelle Development Corporation
Bissell Barry S.
Dunson Philip M.
Gill James J.
Winland Thomas W.
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