Results 121 to 130 of about 13,611 (164)
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The Journal of the Acoustical Society of America, 1994
An acoustic lens system is constructed so that at least one surface of acoustic lenses constituting the acoustic lens system is an aspherical surface, which has such a shape that curvature moderates progressively in separating from the axis of the acoustic lens system, and an acoustic beam stop is provided therein.
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An acoustic lens system is constructed so that at least one surface of acoustic lenses constituting the acoustic lens system is an aspherical surface, which has such a shape that curvature moderates progressively in separating from the axis of the acoustic lens system, and an acoustic beam stop is provided therein.
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Acoustic Field in a Luneberg Lens
The Journal of the Acoustical Society of America, 1967A Luneberg lens, which is a perfectly focusing omnidirectional spherical lens, has been subjected to a wave analysis. Plane radiation incident on a fluid lens was assumed. The separability of the scalar Helmholtz equation for the lens region permits the representation of the internal acoustic field as an expansion in Legendre polynomials and radial ...
G. E. Lord, H. R. Feldman
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The Journal of the Acoustical Society of America, 1984
A lens structure is disclosed for a transducer that is utilized to transmit pulses of alternating pressure waves into the body of a patient and produce signals in response to reflections from the body. The lens is comprised of a first lens element having a concave face facing the crystals and a second lens element filling the space between.
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A lens structure is disclosed for a transducer that is utilized to transmit pulses of alternating pressure waves into the body of a patient and produce signals in response to reflections from the body. The lens is comprised of a first lens element having a concave face facing the crystals and a second lens element filling the space between.
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The Journal of the Acoustical Society of America, 1992
In an acoustic lens apparatus of this invention, a lens surface formed on an ultarsonic medium has a longitudinal wave lens portion constituted by a first aspherical surface at its central area, and a transverse wave lens portion constituted by a second aspherical surface at its peripheral area. The ultrasonic medium includes a piezoelectric transducer
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In an acoustic lens apparatus of this invention, a lens surface formed on an ultarsonic medium has a longitudinal wave lens portion constituted by a first aspherical surface at its central area, and a transverse wave lens portion constituted by a second aspherical surface at its peripheral area. The ultrasonic medium includes a piezoelectric transducer
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The Journal of the Acoustical Society of America, 1970
An acoustic compound design fulfilling the aperture and resolution requirements of the quartz-plate Solkolov acoustic image converter is described. Details of the lens construction and images obtained from its operation are presented.
J. L. DuBois, W. Rosenblum, R. Gilmore
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An acoustic compound design fulfilling the aperture and resolution requirements of the quartz-plate Solkolov acoustic image converter is described. Details of the lens construction and images obtained from its operation are presented.
J. L. DuBois, W. Rosenblum, R. Gilmore
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Acoustic Transducers and Lens Design for Acoustic Microscopy
1987The transducer-lens system is one major component in the performance of an acoustic microscope. The design criteria for the various types of applications of an acoustic microscope are different. For surface imaging applications, it is desired to have a small spot size and low sidelobe level.
Chou, C.-H., Khuri-Yakub, B.
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Nonspherical acoustic lens study
The Journal of the Acoustical Society of America, 1976A successful short focal length radar lens design technique was adapted to the problem of nonspherical thin underwater acoustic lens development and construction. The motivation was furnished by the many sonar requirements for small size lenses capable of operation in a scanning mode.
Kevin T. Corbett +2 more
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Acoustic Lens and Ultrasonic Probe Using the Lens
The Journal of the Acoustical Society of America, 2011The invention has a structure, in an acoustic lens for an ultrasonic probe comprising leg portions which are connected by a planar shape, and a lens portion which is provided on the leg portions and has curvature in the lengthwise direction, wherein the leg portions are made from an attenuation prevention material having the less ultrasonic propagation
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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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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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