Download e-book for iPad: Acoustical Imaging by Frederic L. Lizzi, D. Jackson Coleman, Jack Driller (auth.),

By Frederic L. Lizzi, D. Jackson Coleman, Jack Driller (auth.), A. J. Berkhout, J. Ridder, L. F. van der Wal (eds.)

ISBN-10: 1461295246

ISBN-13: 9781461295242

ISBN-10: 1461325234

ISBN-13: 9781461325239

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Special Issue on Ultrasonic Hyperthermia, IEEE Trans. Sonics and Ultrasonics, L. Frizzell and S. ), SU-31, 1984. , Weininger, R. , "Vitreous Dispersion by Ultrasound," Ann. , 2:389-396, 1970. J. , "Experimental Cataract Productions by High Frequency Ult rasound," Ann. Ophthalmo 1. , 10:934-942, 1978. 15 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. A. , "Experimental, Ultrasonically Induced Lesions in the Retina, Choroid and Sclera," Invest. , 17:350-360, 1978. A. , "Effects of Pulsed Ultrasound on Ocular Tissue," Ultrasound in Medicine and Biology, 7:245-252, 1981.

The pressure field P(r,w) may be obtained from the displacement U(r,w) by Hooke's law. g. Blake, 1952) : P(r ,w) = -[(A + 2~)a r U(r,w) + 2AU(r,w)/rJ (9) Thus the pressure field can be expressed as: P(r,w) _[pw 2 - 1 . 4~(~ + JW) J~ (r,w) r rv For a fluid (in which the shear modulus a homogeneous elastic solid, this reduces to: 46 ~ (10 ) is zero), or for large r in P(r,oo) = -pwZt(r,oo) (11) The Nearfield and the Farfield of the Linear Regions: Bandlimiting Effects on the Farfield Wavelet The expressions for the particle displacement, particle velocity and 1 particle acceleration each have two terms: a 1 term and a?

T) clearly depends on both the source and 1J receiver position relative to the geology. Since the sound waves travel from the shot to the receiver by a variety of paths, leaving the shot in many different directions, the convolution implies that the seismic wavelet produced by the shot is the same in all these directions. This is achieved if the wavefield of the shot has spherical symmetry. Ideally we should like our seismic wavelet to be a perfect Dirac pulse 6 (t), and to have no noise, for then x.

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Acoustical Imaging by Frederic L. Lizzi, D. Jackson Coleman, Jack Driller (auth.), A. J. Berkhout, J. Ridder, L. F. van der Wal (eds.)

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