Accession Number : AD0608729

Title :   SHEAR WAVE INTERFERENCE OBSERVED BY OPTICAL BIREFRINGENCE INDUCED IN A VISCOELASTIC LIQUID.

Descriptive Note : Technical rept.,

Corporate Author : OKLAHOMA STATE UNIV STILLWATER RESEARCH FOUNDATION

Personal Author(s) : Schrag,J. L. ; Guess,J. F. ; Thurston,G. B.

Report Date : NOV 1964

Pagination or Media Count : 19

Abstract : A theoretical and experimental study of the shear wave field and the associated optical birefringence produced by interfering primary and reflected wave trains propagating in a viscoelastic medium is presented. The shear wave field is generated by two parallel planes, one oscillating sinusoidally in its own plane, the other held motionless at a fixed distance from the driving plane. The shear wave induced birefringence was analyzed by a determination of the modification of the state of polarization of incident circularly polarized light upon passage through the medium. The limiting cases of small and large separation between generating surface and reflecting surface with respect to the shear wavelengths in the medium are useful for determinations of the propagation constant and the mechano-optic constant, while intermediate values of separation of surfaces are useful for demonstrations of the character of the stationary wave patterns. Theoretical determinations of the velocity gradient distribution in the medium for various ratios of surface separation to shear wavelength are presented together with experimental determinations for an aqueous suspension of milling yellow. (Author)

Descriptors :   (*MECHANICAL WAVES, INTERFERENCE), (*REFRACTION, MECHANICAL WAVES), LIQUIDS, VISCOELASTICITY, DYES, OSCILLATION, PROPAGATION, VELOCITY, OPTICAL PHENOMENA

Distribution Statement : APPROVED FOR PUBLIC RELEASE