Temat: ultrasonic transducer - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Prototype of Wideband Air Sonar Based on STM32
Autorzy:: Okoń-Fąfara, M.
Kawalec, A.
Fąfara, B.
Powiązania:: https://bibliotekanauki.pl/articles/176827.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: imaging air sonar
STM32
ultrasonic transducer
Opis:: The paper presents a project of a low-cost prototype version of a wideband air sonar and the problems occurring during its development process. The aim of this work was to design a short range air sonar capable of creating the reflectivity map of its surroundings using an arbitrary shape wideband signal. The transmitting and receiving transducers that have been chosen for this application typically work in pulsed operation modes. Therefore, dedicated output and input circuits had to be designed to expand its capabilities without information losses. The signal generation, transmission, reception and storage are managed by a Discovery evaluation board with a STM32 microcontroller. The receiving data are saved on a SD card and are processed off-line.
Źródło:: Archives of Acoustics; 2017, 42, 4; 761-765
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: A Digitally Controlled Model of an Active Ultrasonic Transducer Matrix for Projection Imaging of Biological Media
Autorzy:: Opieliński, K. J.
Gudra, T.
Pruchnicki, P.
Powiązania:: https://bibliotekanauki.pl/articles/178008.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ultrasonic projection
active ultrasonic transducer matrix
multielement ultrasonic probe
electrode attachment optimisation
Opis:: The following work presents the idea of constructing a digitally controlled active piezoceramic transducer matrix for ultrasonic projection imaging of biological media in a similar way as in case of roentgenography (RTG). Multielement ultrasonic probes in the form of flat matrices of elementary piezoceramic transducers require attaching a large number of electrodes in order to activate the individual transducers. This paper presents the idea of minimising the number of transducer connections in an active row-column matrix system. This idea was verified by designing a model of a matrix consisting of 16 ultrasonic transducers with electrode attachments optimised by means of electronic switches in rows and columns and miniature transistor switches in the nodes of the matrix allowing to activate selected transducers. The results of measurements and simulations of parameters of the designed matrix show that it is suitable to be used in projection imaging of biological media as a sending probe. In to use the matrix as a universal sending or receiving probe, it was suggested to add further switches that would eliminate the undesired effect of crosstalks in case of switches used for toggling the transducers in the nodes of the matrix.
Źródło:: Archives of Acoustics; 2010, 35, 1; 75-90
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: Narrow Beam Ultrasonic Transducer Matrix Model for Projection Imaging of Biological Media
Autorzy:: Opieliński, K. J.
Gudra, T.
Pruchnicki, P.
Powiązania:: https://bibliotekanauki.pl/articles/178004.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ultrasonic projection
directional ultrasonic transducer matrix
multielement ultrasonic probe
electrode attachment optimisation
Opis:: The following paper presents an idea of minimising the number of connections of individual piezoelectric transducers in a row-column multielement passive matrix system used for imaging of biological media structure by means of ultrasonic projection. It allows to achieve significant directivity with acceptable input impedance decrease. This concept was verified by designing a model of a passive ultrasonic matrix consisting of 16 elementary piezoceramic transducers, with electrode attachments optimised by means of electronic switches in rows and columns. Distributions of acoustic field generated by the constructed matrix model in water and results of the calculations conformed well.
Źródło:: Archives of Acoustics; 2010, 35, 1; 91-109
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: Research and Modeling of Mechanical Crosstalk in Linear Arrays of Ultrasonic Transducers
Autorzy:: Celmer, M.
Opieliński, K.
Powiązania:: https://bibliotekanauki.pl/articles/176916.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: mechanical crosstalk
ultrasonic transducer array
FEM modeling
COMSOL Multiphysics
Opis:: Linear arrays of ultrasonic transducers are commonly used as ultrasonic probes in medical diagnostics for imaging the interior of a human body in vivo. The crosstalk phenomenon occurs during the operation of transducers in which electrical voltages and mechanical vibrations are transmitted to adjacent components. As a result of such additional excitation of the transducers in the array, the directivity characteristics of the aperture used changes, and consequently there is interference with proper operation of a given array and the emergence of distortions in the obtained ultrasound image that reduce its quality. This paper studies the manner of propagation of mechanical crosstalk in the designed model of a linear array of ultrasonic transducers on the basis of unwanted signals, which appeared on elementary piezoelectric transducers when power is supplied to the selected transducer in the array. The universal model of linear array of ultrasonic transducers, which has been developed, allowed the simulation of mechanical crosstalk, taking into account the cross-coupling phenomenon in all of its structure with the use of finite elements method (FEM) implemented in COMSOL Multiphysics software. The analysis of crosstalk signals showed that they consist of aggregated pulses propagating with different speeds and frequencies. This signifies the formation of different vibration modes transmitted simultaneously via different paths. The paper is an original approach which enables to identify different vibration modes and estimate their participation in the crosstalk signal and their ways of propagation. Conclusions from the research allow predicting specific design changes which are significant due to the minimization of mechanical crosstalk in linear arrays of ultrasonic transducers.
Źródło:: Archives of Acoustics; 2016, 41, 3; 599-612
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: A Study of Directional Patterns of Ultrasonic Parametric Array
Autorzy:: Rakov, Denis S.
Rakov, Aleksandr S.
Kudryavtsev, Andrey N.
Krasnenko, Nikolay P.
Chursin, Yury A.
Murin, Maksim A.
Powiązania:: https://bibliotekanauki.pl/articles/176760.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: antenna array
ultrasonic transducer
primary frequency
differential frequency
parametric array
Opis:: The paper presents results of numerical calculations and experimental data on the directional pattern of two 38-element parametric arrays composed of ultrasound sources. Two types of antenna arrays are considered, namely with parallel and coaxial connections of ultrasonic transducers (elements). The results of selecting and functional testing of unit elements are described in this paper. It is found that in the coaxial element connection of the antenna array, the level of side lobes is higher than that in the paralel element connection.
Źródło:: Archives of Acoustics; 2019, 44, 2; 301-307
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 6.

Tytuł:: Identification of rock bolt length in situ conditions
Identyfikacja długości żerdzi kotwiowej w warunkach in situ
Autorzy:: Staniek, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/1840914.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: mine
rock bolt
support system
diagnosis
ultrasonic transducer
górnictwo
żerdź
obudowa kotwiowa
diagnostyka
głowica ultradźwiękowa
Opis:: A rock bolt which is grouted into the rock strata may not be installed according to the assumed project. It concerns also cases where due to practical reasons it is impossible to drill a hole with a sufficient deepness. The consequence of that is that it is necessary to cut the rock bolt accordingly. Another case is where the rock bolt is damaged, cut or bent. Than it is desirable to check the quality of supporting elements – installed rock bolts and the length of insertion. In proposed paper an outline of a method for measurement of rock bolt length is presented. The method uses ultrasonic transducers and is based on a pulse emission of an impulse wave. As ultrasonic transducer works both as an emitter and receiver, the reflected wave is measured and the length of the object or the position of a crack or damage may be diagnosed.
Żerdź kotwiowa, która jest wklejona w górotworze może być zamocowana nie zgodnie z założonym projektem. Dotyczy to również tych przypadków, w których ze względu na uwarunkowania techniczne nie możliwe jest odwiercenie otworu na zamierzoną głębokość. Konsekwencją tego jest konieczność skrócenia żerdzi odpowiednio do głębokości otworu. Innym powodem skrócenia żerdzi jest jej uszkodzenie, zerwanie lub zgięcie. W związku z tym jest zasadnym zdiagnozowanie poprawności działania zabezpieczenia kotwowego. W przedstawiony artykule opisana została metoda pomiaru długości żerdzi kotwiowych. W metodzie stosowane są głowice ultradźwiękowe, działające jako nadajnik i odbiornik sygnałów impulsowych. Impuls – fala ultradźwiękowa generowana przez głowicę odbija się od przeszkody, końca żerdzi lub uszkodzenia i powraca do punktu wymuszenia. Przez pomiar czasu pomiędzy wymuszeniem i odbiorem impulsu oraz na podstawie znajomości prędkości rozchodzenia się fali ultradźwiękowej długość żerdzi lub odcinka żerdzi jest wyznaczana.
Źródło:: Diagnostyka; 2021, 22, 2; 67-73
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 7.

Tytuł:: Model of multipath propagation of ultrasonic pulses in soft tissue using divergent beam tomography method
Autorzy:: Borowski, Jędrzej
Opieliński, Krzysztof J.
Powiązania:: https://bibliotekanauki.pl/articles/127791.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: model of multipath propagation of ultrasonic pulses
ultrasonic transducer ring array
divergent wave beam
soft tissue
ultrasound tomography
model wielościeżkowej propagacji impulsów ultradźwiękowych
pierścieniowa głowica ultradźwiękowa
rozbieżna wiązka fali
tkanka miękka
tomografia ultradźwiękowa
Opis:: The paper presents the model of calculating ultrasound waveform beam emitted inside the circular space of ultrasonic transducer ring array and propagated through a biological medium submerged in water. Each elementary transducer emits a burst signal, which then propagates through a medium and is received by a number of transducers on the opposite side of the ring array. The method allows for calculating runtime and amplitude of ultrasonic bursts while traveling from an emitter to a receiver through a specified soft tissue section geometry, having regard to the refraction and attenuation effects and directivity pattern of transducers. The soft tissue section geometry is constructed using circular shapes with given ultrasound speed and attenuation distribution. The elaborated software creates a set of received waveforms for each transmitting transducer. The presented results produced by the software can be used as a basis for further research on inverse problems in ultrasound waveform tomography.
Źródło:: Vibrations in Physical Systems; 2019, 30, 1; 1-8
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 8.

Tytuł:: Annular Array Transducer and Matched Amplifier for Therapeutic Ultrasound
Autorzy:: Secomski, W.
Nowicki, A.
Wójcik, J.
Lewandowski, M.
Walczak, M.
Tymkiewicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/177840.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ultrasonic therapy
annular array transducer
ultrasonic field
Opis:: The use of therapeutic ultrasound continues to grow. A focused ultrasonic wave can increase the tissue temperature locally for the non-invasive cancer treatment or other medical applications. The authors have designed a seven-element annular array transducer operating at 2.4 MHz. Each element was excited by sine burst supplied by a linear amplifier and FPGA control circuits. The acoustic field, generated by a transducer was initially numerically simulated in a computer and next compared to water tank hydrophone measurements performed at 20, 40 and 60 mm focal depth. The results showed good agreement of the measurements with theory and the possibility to focus the ultrasound in the preselected area. The total acoustic power radiated by the annular array was equal to 2.4 W.
Źródło:: Archives of Acoustics; 2010, 35, 4; 653-660
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 9.

Tytuł:: The Influence of Sensitivity Field of Dual Transducer Probes on Accuracy of Discontinuity Sizing and Evaluation in Terms of Testing of Forgings According to EN 10228-3
Autorzy:: Kaczmarek, R.
Kaczmarek, K.
Powiązania:: https://bibliotekanauki.pl/articles/352659.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: non destructive testing
ultrasonic testing
double transducer probe
Opis:: The article presents results of research on the impact of sensitivity distribution of double transducer probes, which are often used in non-destructive ultrasonic testing of components such as forgings. Distribution of sensitivity measured in two orientations, parallel and perpendicular to the plane of separation of a double transducer probe has been tested and analyzed. A significant influence of orientation of a probe on echo envelope of an artificial point discontinuity has been studied. It has revealed great differences in length and shape of an echo envelope, depending on a type of probe and orientation of a probe separation plane to the moving direction. Eventually, the analysis of practical consequences of dual transducer probes usage for characterization of a type, dimensioning and evaluation of internal discontinuities, in accordance to the methodology specified in EN 10228, has been conducted.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 3; 1677-1682
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 10.

Tytuł:: Ultrasonic Mammography with Circular Transducer Array
Autorzy:: Opieliński, K. J.
Pruchnicki, P.
Gudra, T.
Powiązania:: https://bibliotekanauki.pl/articles/177684.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ultrasonic projection imaging
UPI
ultrasonic mammography
circular transducer array
woman’s breast tissue
Opis:: Ultrasonic projection imaging is similar to X-ray radiography. Nowadays, ultrasonic projection methods have been developed in the set-up of multi-element flat arrays with miniature transducers, where one of the array acts as a transmitter and the other one is a receiver. In the paper, a new method of the projection imaging using a 1024-element circular ultrasonic trans- ducer array is presented. It allows the choice of a projection scanning plane for any angle around a studied object submerged in water. Fast acquisition of measurement data is achieved as a result of parallel switch- ing of opposite transmitting and receiving transducers in the circular array and vertical movement of the array. The algorithm equalizing the length of measurement rays and the distances between them was elaborated for the reconstruction of projection images. Projection research results of breast phantom obtained by means of the elaborated measurement set- up and compared with mammography simulations (acquired through overlapping of X-ray tomographic images) show that ultrasonic projection method presented in this paper (so-called ultrasonic mammogra- phy) can be applied to the woman’s breast and be used as a diagnosis for an early detection of cancerous lesions. It can, most of all, be used as an alternative or complementary method to standard mammog- raphy, which is harmful because of ionizing radiation and invasive due to the mechanical compression of tissue.
Źródło:: Archives of Acoustics; 2014, 39, 4; 559-568
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "ultrasonic transducer" wg kryterium: Temat

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język