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Response of acoustic imaging systems using convergent leaky waves to cylindrical flaws
(IEEE, 1989)
Characterization of near-surface properties of materials by acoustic means is most convenienth done by surface-acoustic-waves (SAW) that are spatially confined to the surface. There are several techniques available to ...
A fast method of calculating diffraction loss between two facing transducers
(IEEE, 1988)
A fast method of calculating the diffraction loss between two facing circular ultrasonic transducers of unequal size is presented. This problem is directly applicable for minimization of diffraction loss in acoustic lens ...
High efficiency Lamb wave lens for subsurface imaging
(IEEE, 1989-10)
A conventional scanning acoustic microscope lens excites all the possible modes of acoustic waves in the solid structure under examination. The excited leaky modes contribute significantly to the high contrast obtained in ...
A general purpose VLSI median filter and its applications for image processing
(IEEE, 1989)
A general-purpose median filter configuration consisting of two single-chip median filters is proposed. One of the chips is designed for applications requiring variable word-length and variable window size, whereas the ...
Generation of focused surface waves with a solid wedge
(IEEE, 1987)
Focusing of surface acoustic waves on material surfaces was achieved by axicons in liquid immersion. The system consisted of a plane acoustic wave generator obliquely insonifying a cylindrical mirror placed perpendicularly ...
A 128-bit microprocessor compatible programmable correlator chip for use in synchronous communication
(IEEE, 1989)
A single-chip microprocessor-compatible 128-b correlator is designed and implemented in a 3-μm M2CMOS process. Full-custom design techniques are applied to achieve the best tradeoff among chip size, speed, and power ...
Measurement of sensitivity of different wave modes to subsurface defects
(IEEE, 1988)
Excitation of acoustic wave modes in a layered solid is investigated when the solid is immersed in a liquid. This is done by computing the reflection coefficient of acoustic plane waves at the liquid-layered-solid
interface. ...
Design and implementation of a general purpose VLSI median filter unit and its applications
(IEEE, 1989)
A VLSI median filter unit has been designed and implemented in 3-μ m M2 CMOS, using full-custom VLSI design techniques. The unit consists of two single-chip median filters, one extensible and one real-time. The chips are ...
Increasing the sensitivity of the scanning acoustic microscope to anisotropy
(IEEE, 1987)
The response of the scanning acoustic microscope to anisotropic materials is theoretically investigated. For this purpose, the reflection coefficient of plane acoustic waves incident on a liquid-anisotropic-solid interface ...
Focusing surface waves using an axicon
(A I P Publishing, 1985-12)
Axicons are generators of waves which focus on a line. They are used in various imaging and nondestructive testing applications as bulk wave focusing devices with a very long depth of focus. In this letter, a new type of ...