Results 331 to 340 of about 1,899,314 (382)

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

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 ...
openaire   +1 more source

Air Writing via Receiver Array-Based Ultrasonic Source Localization

IEEE Transactions on Instrumentation and Measurement, 2020
Air-writing systems have recently been proposed as tools for human-machine interaction where instructions can be represented using letters or digits written in the air. Different technologies have been used to realize air-writing systems. In this article,
Hui Chen, Tarig Ballal, A. Muqaibel, Xiangliang Zhang, T. Al-Naffouri   +4 more
semanticscholar   +1 more source

Boosting the application of ultrasonic arrays

AIP Conference Proceedings, 2002
The strategy currently pursued at IZFP to open a wider field of applications for ultrasonic arrays is described. A bundle of measures is performed to reduce the costs and at the same time to improve the capabilities and the reliability of ultrasonic array systems.
openaire   +1 more source

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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Ultrasonic imaging using arrays

Proceedings of the IEEE, 1979
An analysis is presented of the two general types of arrays-the direct imaging array and the phased array. These are analyzed over three levels of approximation: geometric optics, steady-state sinusoidal diffraction, and wide-band diffraction. Systems are studied which provide electronic deflection and focusing.
openaire   +1 more source

Ultrasonic phased array controller for hyperthermia applications

Ultrasonics, 1991
Multiple and mechanically scanned ultrasound transducer systems have demonstrated the efficacy of using ultrasound to produce deep localized hyperthermia. The use of ultrasonic phased arrays has been proposed as an alternative to these systems. A phased array offers a more flexible approach to heating tumours in that the size, shape, and position of ...
P J, Benkeser, T L, Pao, Y J, Yoon
openaire   +2 more sources