Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Moo-Joon Kim"'
Publikováno v:
Micromachines, Vol 15, Iss 7, p 917 (2024)
Piezoelectric composites, which consist of piezoelectric materials and polymers, are widely employed in various applications such as underwater sonar transducers and medical diagnostic ultrasonic transducers. Acoustic transducers based on piezoelectr
Externí odkaz:
https://doaj.org/article/62a73ca8dc14420e8913b129a7c58c59
Publikováno v:
Journal of Korea Society of Waste Management. 37:85-92
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0335504759e03df67dca2663992a0ad7
https://doi.org/10.9786/kswm.2020.37.2.85
https://doi.org/10.9786/kswm.2020.37.2.85
Publikováno v:
The Journal of the Acoustical Society of Korea. 31:514-522
The temperature dependence of the characteristics in a PZT-5 piezoelectric ceramic vibrator with the transverse mode was investigated in the range of to using a thermal vacuum chamber to utilize the vibrator in aerospace industries. As the results, a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3316f587c9565f58aca51fd036012a49
https://doi.org/10.7776/ask.2012.31.8.514
https://doi.org/10.7776/ask.2012.31.8.514
Publikováno v:
Japanese Journal of Applied Physics. 46:4459-4461
Using the theory of coupled vibrations, the lateral-excitation mode is theoreticaliy analyszed. As a result, a formula for the electromechanical coupling coefficient k31 was derived as a function of the aspect ratio between the width and length of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09da15a423022a6c25db5ad5a641437a
https://doi.org/10.1143/jjap.46.4459
https://doi.org/10.1143/jjap.46.4459
Publikováno v:
Japanese Journal of Applied Physics. 42:3198-3199
In this paper, we present a new method for beam width control of transducer array using two-layered piezoelectric transducers of which electroacoustic efficiency can be controlled by a capacitor. The measured result for beam width control of the tran
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ae05a68725bfd8a26d5b33efe4e3b04
https://doi.org/10.1143/jjap.42.3198
https://doi.org/10.1143/jjap.42.3198
Publikováno v:
Japanese Journal of Applied Physics. 42:3091-3092
Using a bimorph-type bending actuator, we propose a new method for controlling the focal length of a transducer by electric DC voltage. We designed two focal length controllable ultrasonic transducers with actuators, a line-focus and a point-focus tr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::839c158ca4b30548d1894d254924a118
https://doi.org/10.1143/jjap.42.3091
https://doi.org/10.1143/jjap.42.3091
Publikováno v:
Japanese Journal of Applied Physics. 43:3188
In order to determine the size of the vibrating surface of an individual element and the spaces among elements in a cylindrically arrayed ultrasonic transducer, enormous calculations for mutual- and self-radiation impedances should be accomplished wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7e199bbb5f981dd392f82da1cdccf28
https://doi.org/10.1143/jjap.43.3188
https://doi.org/10.1143/jjap.43.3188
Publikováno v:
Japanese Journal of Applied Physics. 43:3061
In ultrasonic computed tomography (UCT), it is necessary to synthesize a plane wave using waves emitted from sound sources arranged in the interior surface of a cylinder. In order to transmit a plane wave into a cylindrical surface, an ultrasonic tra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f09afa6dafdfe4a878f3f180484733a
https://doi.org/10.1143/jjap.43.3061
https://doi.org/10.1143/jjap.43.3061
Publikováno v:
Japanese Journal of Applied Physics. 43:3059
In order to give a wide beam width characteristic to a vibrating element, acoustic convex lenses were fabricated and the diverged acoustic field was investigated experimentally. To design the acoustic lenses, an acoustic field estimation method was p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5346359545d63ce812fbdb73f1d5b450
https://doi.org/10.1143/jjap.43.3059
https://doi.org/10.1143/jjap.43.3059
Publikováno v:
The Journal of the Acoustical Society of America. 103:3041-3041
When the piezoelectric ceramic, PZT is used in the water it needs matching layers for efficient energy transmission. PZT is known as the proper piezoelectric material for the transmitter by reason of the large electromechanical coupling factor. So ac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cc3c4d3afbf7f59f76fd9ac721a77c93
https://doi.org/10.1121/1.422606
https://doi.org/10.1121/1.422606