Archives of Acoustics, 19, 3, pp. 381-393, 1994

On generating ultrasounds by laser in polymers

L. RADZISZEWSKI
Chair of Mechanical Equipment, Kielce University of Technology
Poland

The paper reports an experimental investigation of the possibility of generating ultrasonic waves by a Q-switched Nd:YAG laser of small power in polymers by the example of polyvinyl chloride. The possibility of creating acoustic-point-sources in visco-elastic materials is confirmed. Explanation of the mechanism of generation of ultrasonic waves is proposed. Directivity amplitude patterns of the acoustic sources are determined using ultrasonic broadband of resonance frequencies: 1 MHz, 2.25 MHz, 5 MHz, and a head for acoustic emision. The directivity frequency pattern for a head 2.25 MHz is also determined.
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Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).

References

A. G. BELL, Phil. Mag,, 11, 510-528 (1881).

V.J. DANILOWSKAYA, Thermal stresses in an elastic half-space due to sudden heating on the surface, J. Appl. Math. Mech., 14, 316-318 (1950).

R.M. WHITE, Generation of elastic waves by transient surface heating, 3. Appl. Phys., 34, 3559-3567 (1963).

J. F. READY, Effects due to absorption of laser radiation, J. Appl. Phys., 36, 462-468 (1965).

1 J. C. BUSHNELL and D. J. McCLOSKEY, Thermoelastic stress production in solids, J. Appl. Phys., 39, 5541-5546 (1968).