Results 291 to 300 of about 1,828,003 (344)

Ultrasonic Array Design and Performance

1979
Acoustical imaging obeys the fundamental laws of optics. When an object is visualized with a given system (optical or acoustical) the image obtained is the convolution of the object and the system transfer function. This is exactly what takes place when acoustical signals, reflected from a biological structure, are received by an array of transducers ...
Ph. Defranould, J. Souquet
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Ultrasonic phased array systems

The Journal of the Acoustical Society of America, 1980
Ultrasonic phased array method and apparatus for the static or dynamic investigation of structures, such as organs of the body, or intra-uterine detail, wherein ultrasonic echo pulses, reflected back from a testpiece to one or a group of adjacent transducers of a linear transducer array, are converted to corresponding electric signals which are then ...
James M. S. Hutchison, Robert D. Selbie
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Ultrasonic transducer array used in ultrasonic diagnosis apparatus

The Journal of the Acoustical Society of America, 1989
In an ultrasonic transducer array used in an ultrasonic diagnosis apparatus, the pitch of transducer elements of peripheral subarrays is made smaller than that of a central subarray. The central transducer elements are adapted for acquiring a tomogram of an object to be examined, and the peripheral transducer elements are adapted for acquiring flow ...
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Array-driven ultrasonic microactuators

TRANSDUCERS '91: 1991 International Conference on Solid-State Sensors and Actuators. Digest of Technical Papers, 2002
The authors present the design of an array-driven ultrasonic microactuator. Unlike a conventional ultrasonic motor, the array-driven ultrasonic microactuator consists of many distributed modules, using a concept similar to that of the distributed microactuator array. With a conventional ultrasonic motor, it is difficult to control an object locally and
T. Furuhata, T. Hirano, H. Fujita
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Convex array ultrasonic probe

The Journal of the Acoustical Society of America, 1989
An ultrasonic probe used for ultrasonic diagnosis apparatus. A plurality of ultrasonic transducer elements are provided in a convexity at the tip of a probe so as to constitute a convex array ultrasonic probe. The curvature radius of the convexity is set at not greater than 12 mm and the pitch of adjacent transducer elements is set at not greater than ...
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Optimization of Ultrasonic Phased Arrays

1998
Ultrasonic phased arrays are an emerging technology in nondestructive evaluation (NDE) applications. A phased array is a multi-element piezo-electric device whose elements are individually excited by electric pulses at programmed delay times [1]. Such a delay scheme allows electronically controlled dynamic beam control.
Wooh, Shi-Chang, Shi, Yijun
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Ultrasonic transducer array shading

The Journal of the Acoustical Society of America, 1984
A linear array for rectilinear and sector scan imaging has identical approximately diamond-shaped transducer elements fabricated by making two pairs of straight line cuts at small angles through a piezoelectric slab. The Y-axis radiation pattern (parallel to element length and perpendicular to the array length) has lower side lobe levels than equal ...
Lowell S. Smith, Axel F. Brisken, Michael S. Horner   +2 more
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Movable ultrasonic transducer array

The Journal of the Acoustical Society of America, 1986
@ A movable, ultrasonic transducer array for use in an ultrasonic inspection system that employs a signal detector and display of the liquid crystal cell (18) type. The movable array uniformly insonifies the object (16) to be inspected and is particularly for inspecting large objects or large areas of an object.
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Ultrasonic contact transducer and array

The Journal of the Acoustical Society of America, 1994
A flexible ultrasonic contact transducer comprises an unpoled polymeric film layer and a poled piezo film layer. Electrode shielding layers are disposed on outer surfaces of the unpoled polymeric film layer and poled piezo film layer. A quarter wave reflector is disposed between inner surfaces of the two layers.
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An Ultrasonic Wheel-Array Probe

AIP Conference Proceedings, 2004
This paper describes the development and modeling of an ultrasonic array wheel probe scanning system. The system operates at 10 MHz using a 64 element array transducer which is 50 mm in length and located in a fluid filled wheel. The wheel is coupled to the test structure dry, or with a small amount of liquid couplant. When the wheel is rolled over the
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