Results 231 to 240 of about 934,305 (288)
Some of the next articles are maybe not open access.
Investigation of ultrasonic array
Ultrasound, 2010This paper explores the data collection method for the ultrasonic array which can drastically decrease the scanning time, because the minimum excitation-reception sequences were used for reconstruction of the coordinates of the defects. The described data collection and processing method do not use classical phased array possibilities such as beam ...
R. Kažys, L. Kairiūkštis
openaire +1 more source
Self-localization with ultrasonic sensor array
2008 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2008We have developed a positioning system that uses a phased array sensor to measure the distance and direction of multiple landmarks relative to the position of a mobile robot so that the robot can self-localize. The positioning system can control the strength and the width of the beam from the phased array sensor and observe the multiple landmarks at ...
Yukihiko Ono +5 more
openaire +2 more sources
Robot guidance using ultrasonic arrays
Journal of Robotic Systems, 1994AbstractThe flexibility of robots can be considerably increased by having sensors that can detect the location and orientation of the components that are being manipulated by the robots. Vision systems have been widely applied to this problem, but there has been very little reported work on the use of ultrasonic sensors. This article reports the use of
Philip Webb, Ian Gibson, Catherine Wykes
openaire +1 more source
Array-driven ultrasonic microactuators
TRANSDUCERS '91: 1991 International Conference on Solid-State Sensors and Actuators. Digest of Technical Papers, 2002The 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
openaire +1 more source
Ultrasonic phased array systems
The Journal of the Acoustical Society of America, 1980Ultrasonic 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
openaire +1 more source
ELECTRONIC ARRAY PROBE FOR ULTRASONIC IMAGING
The Journal of the Acoustical Society of America, 2010An electronic array probe for ultrasonic imaging includes an array of transmitting and/or receiving electroacoustic transducers arranged in concentric bands in which the transducers are tangent to one other in both radial and circumferential directions.
openaire +1 more source
Automatic ultrasonic robotic array
2013 IEEE International Ultrasonics Symposium (IUS), 2013A novel, autonomous reconfigurable ultrasonic phased array inspection robot for non-destructive evaluation (NDE) is presented. The robotic system significantly will reduce manual labor over current inspection regimes, as well as enabling inspection of inaccessible/hazardous areas such as those found in the nuclear and petrochemical industries.
Dobie, Gordon +5 more
openaire +3 more sources
Ultrasonic transducer array used in ultrasonic diagnosis apparatus
The Journal of the Acoustical Society of America, 1989In 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
Ultrasonic Array Design and Performance
1979Acoustical 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
Transducer arrays in medical ultrasonics
The Journal of the Acoustical Society of America, 1978Ultrasonic instrumentation based on linear and phased array transducers is increasingly being used in clinical diagnosis and yields information not hitherto available. However, the use of ultrasonic arrays is not necessarily restricted to diagnosis. They may, in the future, play an important role in therapy as well.
openaire +1 more source