Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Kang-Lyeol Ha"'
Publikováno v:
Sensors and Actuators A: Physical. 279:586-592
In this study, the fabrication process of a piezoelectric poly[(vinylidenefluoride-trifluoroethylene) [P(VDF-TrFE)] film was optimized to maximize its crystallinity and piezoelectric properties and to improve its thermal stability. The effect of puri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7402bc0f69e927212f807760e764294
https://doi.org/10.1016/j.sna.2018.06.060
https://doi.org/10.1016/j.sna.2018.06.060
Autor:
Yonggang Cao, Kang-Lyeol Ha
Publikováno v:
Journal of the Korean Society for Nondestructive Testing. 32:585-596
PVDF(poly vinylidene fluoride) and P(VDF-TrFE)(poly vinylidene fluoride-tetrafluoroethylene) are the typical piezoelectric polymers with unique properties. Even they are inferior to conventional piezoelectric ceramics PZT in electromechanical convers
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b15eb4013d782bc51d6e8ed43261e008
https://doi.org/10.7779/jksnt.2012.32.5.585
https://doi.org/10.7779/jksnt.2012.32.5.585
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:
Journal of Biomedical Optics; Oct2014, Vol. 19 Issue 10, p1-9, 9p
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