1994 Proceedings of IEEE Ultrasonics Symposium最新文献_第9页

Acousto-magnetic effect: experimental evidence and magnetic field sensor applications 声磁效应:实验证据及磁场传感器的应用

1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401630

A. F. Asainov, B. Korshak, M. V. Kunetzov, I. Solodov

引用次数: 0

Third order longitudinal mode piezoelectric ceramic transformer and its application to high-voltage power inverter 三阶纵模压电陶瓷变压器及其在高压逆变器中的应用

1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401643

S. Kawashima, O. Ohnishi, H. Hakamata, S. Tagami, A. Fukuoka, T. Inoue, S. Hirose

{"title":"Third order longitudinal mode piezoelectric ceramic transformer and its application to high-voltage power inverter","authors":"S. Kawashima, O. Ohnishi, H. Hakamata, S. Tagami, A. Fukuoka, T. Inoue, S. Hirose","doi":"10.1109/ULTSYM.1994.401643","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401643","url":null,"abstract":"Color liquid crystal displays (LCD) require low-profile, miniaturized and highly efficient power inverters, replacing conventional electromagnetic transformers, to light up their backlights, which include cold cathode fluorescent lamps (CCFL). The object of this study is to actualize the power inverter, to which a novel multilayered piezoelectric ceramic transformer operating in the third order longitudinal mode is applied. The piezoelectric transformer has a symmetrical structure in the lengthwise direction and its output part operates in a piezoelectric stiffened mode in order to increase both energy conversion efficiency and power density. This transformer has a great advantage, in that all the electronic terminals can be connected at the vibration nodes of the transformer, which contributes to the guarantee of stable transformer performances at high power operation. In this power inverter, a separately excited oscillation circuit was adopted to drive the transformer with high efficiency, and the transformer drive frequency was controlled by detecting the backlight current in order to adjust the backlight luminance properly. Using a triple-layered piezoelectric transformer, a fabricated power inverter exhibited the overall efficiency of 92%, the output power of 4.5 W, which is enough power to light up a 9.4 inches color LCD, including the stray capacitance loss resulted from CCFL mounting. The luminance value on a light transmission plate of the color LCD was 2500 cd/m2 while the inverter dimensions are as small as 76×22×6 mm","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133732040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 86

Measurement of the equivalent circuit parameters of transversely coupled SAW resonator filters 横向耦合SAW谐振器滤波器等效电路参数的测量

1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401557

B. Neubig, J. Beier

引用次数: 1

Properties of the plane and plano-convex resonators using berlinite, gallium phosphate and langasite 利用铍石、磷酸镓和langasite的平面和平凸谐振器的性质

1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401715

J. Détaint, J. Schwartzel, A. Zarka, B. Capelle, D. Cochet-Muchy, E. Philippot

{"title":"Properties of the plane and plano-convex resonators using berlinite, gallium phosphate and langasite","authors":"J. Détaint, J. Schwartzel, A. Zarka, B. Capelle, D. Cochet-Muchy, E. Philippot","doi":"10.1109/ULTSYM.1994.401715","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401715","url":null,"abstract":"In a first part, a comparison of the main piezo-electric properties of the new piezo-electric materials of crystal class 32 is made using computed and experimental results concerning the Y rotated cuts and particularly the thermally compensated cuts. The most important facts observed are the increase of the coupling coefficient from quartz, to berlinite, langasite and gallium phosphate and the outstanding thermal stabilities of the AT cuts of berlinite and of gallium phosphate. New determinations of the angular positions of the compensated cuts of gallium phosphate and doped langasite are reported. In the second part, the comparison is refined in considering the energy trapping properties of resonators using these materials. Computed and experimental results concerning the trapped modes of plane resonators are compared. They indicate that oscillators and filters having more than 4 times the shifts or the bandwidths achievable with quartz can be obtained using the new materials. Extremely high Q factors and the ability to withstand large excitation levels were observed for langasite plano-convex resonators. We conclude that these materials have an unique set of complementary properties well adapted to an extremely broad range of filtering and frequency generation applications","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131870665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

A new low-loss SAW filter technique 一种新的低损耗SAW滤波技术

1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401546

D. P. Morgan, T. Thorvaldsson

引用次数: 8

Experimental study of SAW propagation on gallium orthophosphate SAW在正磷酸镓上传播的实验研究

1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401615

E. Bigler, S. Ballandras, C. Bonjour, D. Palmier, E. Philippot

引用次数: 5

A proposal of a bulk acoustic wave filter using piezoelectrically coupled resonators 一种采用压电耦合谐振器的体声波滤波器的设计

1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401698

T. Uno

引用次数: 2

Array of PVDF sensors for ultrasonic imaging in air 用于空气中超声成像的PVDF传感器阵列

1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401634

L. Capineri, A. Fiorillo, L. Masotti, S. Rocchi

引用次数: 9

Dense motion field estimation involving discontinuities applied to echocardiographic image sequences 涉及不连续的密集运动场估计在超声心动图图像序列中的应用

1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401892

A. Basset, M. Orkisz, I. Magnin, R. Brion

引用次数: 0

The response of an acoustic wave homogeneous immunoassay to immune and non-immune solutions 声波均匀免疫测定法对免疫和非免疫溶液的反应

1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401653

R. Lec, W. Lepuschenko, D. McAllister

引用次数: 1