Results 261 to 270 of about 15,272 (279)
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Acoustic characteristics of the eye lens
1997The purpose of this study is to characterize the eye lens (human and porcine) by acoustic measurements and to investigate whether relations exist with the local protein content. The acoustic measurements were performed with a ‘scanning acoustic microscope’ (SAM), operating at a frequency of 20 MHz.
Thijssen, J.M. +5 more
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Electrically steered acoustic lens
The Journal of the Acoustical Society of America, 1999This invention is a composite acoustic lens that can be steered internally through electrical control. It can collect and direct acoustic energy from a plane wave to focus it on a transducer. It can also take the nearly omnidirectional output from a standard acoustic transducer and direct its energy in a plane wave.
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Horn loudspeaker with acoustic lens
The Journal of the Acoustical Society of America, 1980A moving coil loudspeaker of the type including a pair of co-axial speech coils, one for driving a high frequency diaphragm at the rear of the loudspeaker to provide an output along a horn and the other for driving a cone forming a continuation of the horn and reproducing the lower frequencies has an acoustic lens fitted in the region where the horn ...
Alex V. Garner, Graham Townsend
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Synthesis of a fresnel acoustic lens for acoustic brightness thermometry
Acoustical Physics, 2007The applicability of different types of Fresnel acoustic lenses as antenna array systems in acoustic brightness thermometry of biological tissues is theoretically and numerically analyzed. On the basis of the technical feasibility criterion formulated for these systems, the wavelength suitable for the use in acoustic thermographs with arrays in the ...
E. V. Krotov +2 more
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Laser and acoustic lens for lithotripsy
The Journal of the Acoustical Society of America, 2003An acoustic focusing device whose acoustic waves are generated by laser radiation through an optical fiber. The acoustic energy is capable of efficient destruction of renal and biliary calculi and deliverable to the site of the calculi via an endoscopic procedure.
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The Journal of the Acoustical Society of America, 1981
A cabinet for improving the sound output of an amplifier including an upright housing with a speaker mounted on the front, the front having one or more baffle openings, a device herein called a sound lens inserted in the baffle opening, the vibration of the speaker serving to induce vibration of the sound lens by condensation and rarefaction, by the ...
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A cabinet for improving the sound output of an amplifier including an upright housing with a speaker mounted on the front, the front having one or more baffle openings, a device herein called a sound lens inserted in the baffle opening, the vibration of the speaker serving to induce vibration of the sound lens by condensation and rarefaction, by the ...
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Cylindrical acoustic Luneburg lens
2014 8th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, 2014We developed a two-dimensional acoustic Luneburg lens by changing the density of the medium inside the lens. The lens has a cylindrical shape and composes of about seven hundred aluminum columns with various radii of less than 2cm. It has 15 layers and the diameter of the lens is 60cm.
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The Journal of the Acoustical Society of America, 1996
Lothar Hartmann, Gerhard Buchhotz
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Lothar Hartmann, Gerhard Buchhotz
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Acoustic Field in a Luneberg Lens
The Journal of the Acoustical Society of America, 1968A wave solution is presented for plane acoustic radiation incident on a particular spherical, omnidirectional, perfectly focusing fluid lens.
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Review of acoustic lens developments
The Journal of the Acoustical Society of America, 1977Use of acoustic lenses in underwater applications spans many decades. Lord Rayleigh describes an acoustic lens as early as 1879. Some well-documented experimental lenses were developed by Williams in the 1940's at General Electric. This work with lenses and reflectors led to the development of the U. S.
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